Add missing @Override tags.

src/main/java/org/apache/commons/math4/complex/Complex.java

@@ -153,6 +153,7 @@ public class Complex implements FieldElement<Complex>, Serializable  {
      * @return {@code this + addend}.
      * @throws NullArgumentException if {@code addend} is {@code null}.
      */
+    @Override
     public Complex add(Complex addend) throws NullArgumentException {
         MathUtils.checkNotNull(addend);
         if (isNaN || addend.isNaN) {
@@ -243,6 +244,7 @@ public class Complex implements FieldElement<Complex>, Serializable  {
      * @return {@code this / divisor}.
      * @throws NullArgumentException if {@code divisor} is {@code null}.
      */
+    @Override
     public Complex divide(Complex divisor)
         throws NullArgumentException {
         MathUtils.checkNotNull(divisor);
@@ -296,6 +298,7 @@ public class Complex implements FieldElement<Complex>, Serializable  {
     }
 
     /** {@inheritDoc} */
+    @Override
     public Complex reciprocal() {
         if (isNaN) {
             return NaN;
@@ -520,6 +523,7 @@ public class Complex implements FieldElement<Complex>, Serializable  {
      * @return {@code this * factor}.
      * @throws NullArgumentException if {@code factor} is {@code null}.
      */
+    @Override
     public Complex multiply(Complex factor)
         throws NullArgumentException {
         MathUtils.checkNotNull(factor);
@@ -545,6 +549,7 @@ public class Complex implements FieldElement<Complex>, Serializable  {
      * @return {@code this * factor}.
      * @see #multiply(Complex)
      */
+    @Override
     public Complex multiply(final int factor) {
         if (isNaN) {
             return NaN;
@@ -584,6 +589,7 @@ public class Complex implements FieldElement<Complex>, Serializable  {
      *
      * @return {@code -this}.
      */
+    @Override
     public Complex negate() {
         if (isNaN) {
             return NaN;
@@ -610,6 +616,7 @@ public class Complex implements FieldElement<Complex>, Serializable  {
      * @return {@code this - subtrahend}.
      * @throws NullArgumentException if {@code subtrahend} is {@code null}.
      */
+    @Override
     public Complex subtract(Complex subtrahend)
         throws NullArgumentException {
         MathUtils.checkNotNull(subtrahend);
@@ -1305,6 +1312,7 @@ public class Complex implements FieldElement<Complex>, Serializable  {
     }
 
     /** {@inheritDoc} */
+    @Override
     public ComplexField getField() {
         return ComplexField.getInstance();
     }

src/main/java/org/apache/commons/math4/complex/ComplexField.java

@@ -30,7 +30,7 @@ import org.apache.commons.math4.FieldElement;
  * @see Complex
  * @since 2.0
  */
-public class ComplexField implements Field<Complex>, Serializable  {
+public class ComplexField implements Field<Complex>, Serializable {
 
     /** Serializable version identifier. */
     private static final long serialVersionUID = -6130362688700788798L;
@@ -48,16 +48,19 @@ public class ComplexField implements Field<Complex>, Serializable  {
     }
 
     /** {@inheritDoc} */
+    @Override
     public Complex getOne() {
         return Complex.ONE;
     }
 
     /** {@inheritDoc} */
+    @Override
     public Complex getZero() {
         return Complex.ZERO;
     }
 
     /** {@inheritDoc} */
+    @Override
     public Class<? extends FieldElement<Complex>> getRuntimeClass() {
         return Complex.class;
     }

src/main/java/org/apache/commons/math4/dfp/DfpField.java

@@ -398,6 +398,7 @@ public class DfpField implements Field<Dfp> {
     /** Get the constant 0.
      * @return a {@link Dfp} with value 0
      */
+    @Override
     public Dfp getZero() {
         return zero;
     }
@@ -405,11 +406,13 @@ public class DfpField implements Field<Dfp> {
     /** Get the constant 1.
      * @return a {@link Dfp} with value 1
      */
+    @Override
     public Dfp getOne() {
         return one;
     }
 
     /** {@inheritDoc} */
+    @Override
     public Class<? extends FieldElement<Dfp>> getRuntimeClass() {
         return Dfp.class;
     }

src/main/java/org/apache/commons/math4/special/BesselJ.java

@@ -21,7 +21,6 @@ import org.apache.commons.math4.analysis.UnivariateFunction;
 import org.apache.commons.math4.exception.ConvergenceException;
 import org.apache.commons.math4.exception.MathIllegalArgumentException;
 import org.apache.commons.math4.exception.util.LocalizedFormats;
-import org.apache.commons.math4.special.Gamma;
 import org.apache.commons.math4.util.FastMath;
 import org.apache.commons.math4.util.MathArrays;
 
@@ -139,6 +138,7 @@ public class BesselJ
      * @throws MathIllegalArgumentException if {@code x} is too large relative to {@code order}
      * @throws ConvergenceException if the algorithm fails to converge
      */
+    @Override
     public double value(double x)
         throws MathIllegalArgumentException, ConvergenceException {
         return BesselJ.value(order, x);

src/main/java/org/apache/commons/math4/transform/FastCosineTransformer.java

@@ -87,6 +87,7 @@ public class FastCosineTransformer implements RealTransformer, Serializable {
      * @throws MathIllegalArgumentException if the length of the data array is
      * not a power of two plus one
      */
+    @Override
     public double[] transform(final double[] f, final TransformType type)
       throws MathIllegalArgumentException {
         if (type == TransformType.FORWARD) {
@@ -116,6 +117,7 @@ public class FastCosineTransformer implements RealTransformer, Serializable {
      * @throws MathIllegalArgumentException if the number of sample points is
      * not a power of two plus one
      */
+    @Override
     public double[] transform(final UnivariateFunction f,
         final double min, final double max, final int n,
         final TransformType type) throws MathIllegalArgumentException {

src/main/java/org/apache/commons/math4/transform/FastHadamardTransformer.java

@@ -47,6 +47,7 @@ public class FastHadamardTransformer implements RealTransformer, Serializable {
      * @throws MathIllegalArgumentException if the length of the data array is
      * not a power of two
      */
+    @Override
     public double[] transform(final double[] f, final TransformType type) {
         if (type == TransformType.FORWARD) {
             return fht(f);
@@ -63,6 +64,7 @@ public class FastHadamardTransformer implements RealTransformer, Serializable {
      *   if the number of sample points is negative
      * @throws MathIllegalArgumentException if the number of sample points is not a power of two
      */
+    @Override
     public double[] transform(final UnivariateFunction f,
         final double min, final double max, final int n,
         final TransformType type) {

src/main/java/org/apache/commons/math4/transform/FastSineTransformer.java

@@ -92,6 +92,7 @@ public class FastSineTransformer implements RealTransformer, Serializable {
      * @throws MathIllegalArgumentException if the length of the data array is
      *   not a power of two, or the first element of the data array is not zero
      */
+    @Override
     public double[] transform(final double[] f, final TransformType type) {
         if (normalization == DstNormalization.ORTHOGONAL_DST_I) {
             final double s = FastMath.sqrt(2.0 / f.length);
@@ -115,6 +116,7 @@ public class FastSineTransformer implements RealTransformer, Serializable {
      *   if the number of sample points is negative
      * @throws MathIllegalArgumentException if the number of sample points is not a power of two
      */
+    @Override
     public double[] transform(final UnivariateFunction f,
         final double min, final double max, final int n,
         final TransformType type) {

src/main/java/org/apache/commons/math4/util/BigReal.java

@@ -228,16 +228,19 @@ public class BigReal implements FieldElement<BigReal>, Comparable<BigReal>, Seri
     }
 
     /** {@inheritDoc} */
+    @Override
     public BigReal add(BigReal a) {
         return new BigReal(d.add(a.d));
     }
 
     /** {@inheritDoc} */
+    @Override
     public BigReal subtract(BigReal a) {
         return new BigReal(d.subtract(a.d));
     }
 
     /** {@inheritDoc} */
+    @Override
     public BigReal negate() {
         return new BigReal(d.negate());
     }
@@ -247,6 +250,7 @@ public class BigReal implements FieldElement<BigReal>, Comparable<BigReal>, Seri
      *
      * @throws MathArithmeticException if {@code a} is zero
      */
+    @Override
     public BigReal divide(BigReal a) throws MathArithmeticException {
         try {
             return new BigReal(d.divide(a.d, scale, roundingMode));
@@ -261,6 +265,7 @@ public class BigReal implements FieldElement<BigReal>, Comparable<BigReal>, Seri
      *
      * @throws MathArithmeticException if {@code this} is zero
      */
+    @Override
     public BigReal reciprocal() throws MathArithmeticException {
         try {
             return new BigReal(BigDecimal.ONE.divide(d, scale, roundingMode));
@@ -271,16 +276,19 @@ public class BigReal implements FieldElement<BigReal>, Comparable<BigReal>, Seri
     }
 
     /** {@inheritDoc} */
+    @Override
     public BigReal multiply(BigReal a) {
         return new BigReal(d.multiply(a.d));
     }
 
     /** {@inheritDoc} */
+    @Override
     public BigReal multiply(final int n) {
         return new BigReal(d.multiply(new BigDecimal(n)));
     }
 
     /** {@inheritDoc} */
+    @Override
     public int compareTo(BigReal a) {
         return d.compareTo(a.d);
     }
@@ -319,6 +327,7 @@ public class BigReal implements FieldElement<BigReal>, Comparable<BigReal>, Seri
     }
 
     /** {@inheritDoc} */
+    @Override
     public Field<BigReal> getField() {
         return BigRealField.getInstance();
     }

src/main/java/org/apache/commons/math4/util/BigRealField.java

@@ -48,16 +48,19 @@ public class BigRealField implements Field<BigReal>, Serializable  {
     }
 
     /** {@inheritDoc} */
+    @Override
     public BigReal getOne() {
         return BigReal.ONE;
     }
 
     /** {@inheritDoc} */
+    @Override
     public BigReal getZero() {
         return BigReal.ZERO;
     }
 
     /** {@inheritDoc} */
+    @Override
     public Class<? extends FieldElement<BigReal>> getRuntimeClass() {
         return BigReal.class;
     }

src/main/java/org/apache/commons/math4/util/CentralPivotingStrategy.java

@@ -37,6 +37,7 @@ public class CentralPivotingStrategy implements PivotingStrategyInterface, Seria
      * the first and the last element indices of the array slice
      * @throws MathIllegalArgumentException when indices exceeds range
      */
+    @Override
     public int pivotIndex(final double[] work, final int begin, final int end)
         throws MathIllegalArgumentException {
         MathArrays.verifyValues(work, begin, end-begin);

src/main/java/org/apache/commons/math4/util/Combinations.java

@@ -16,11 +16,11 @@
  */
 package org.apache.commons.math4.util;
 
-import java.util.Iterator;
-import java.util.Comparator;
-import java.util.Arrays;
-import java.util.NoSuchElementException;
 import java.io.Serializable;
+import java.util.Arrays;
+import java.util.Comparator;
+import java.util.Iterator;
+import java.util.NoSuchElementException;
 
 import org.apache.commons.math4.exception.DimensionMismatchException;
 import org.apache.commons.math4.exception.MathInternalError;
@@ -129,6 +129,7 @@ public class Combinations implements Iterable<int[]> {
     }
 
     /** {@inheritDoc} */
+    @Override
     public Iterator<int[]> iterator() {
         if (k == 0 ||
             k == n) {
@@ -224,6 +225,7 @@ public class Combinations implements Iterable<int[]> {
         /**
          * {@inheritDoc}
          */
+        @Override
         public boolean hasNext() {
             return more;
         }
@@ -231,6 +233,7 @@ public class Combinations implements Iterable<int[]> {
         /**
          * {@inheritDoc}
          */
+        @Override
         public int[] next() {
             if (!more) {
                 throw new NoSuchElementException();
@@ -280,6 +283,7 @@ public class Combinations implements Iterable<int[]> {
         /**
          * Not supported.
          */
+        @Override
         public void remove() {
             throw new UnsupportedOperationException();
         }
@@ -302,10 +306,12 @@ public class Combinations implements Iterable<int[]> {
             this.singleton = singleton;
         }
         /** @return True until next is called the first time, then false */
+        @Override
         public boolean hasNext() {
             return more;
         }
         /** @return the singleton in first activation; throws NSEE thereafter */
+        @Override
         public int[] next() {
             if (more) {
                 more = false;
@@ -315,6 +321,7 @@ public class Combinations implements Iterable<int[]> {
             }
         }
         /** Not supported */
+        @Override
         public void remove() {
             throw new UnsupportedOperationException();
         }
@@ -351,6 +358,7 @@ public class Combinations implements Iterable<int[]> {
          * @throws OutOfRangeException if an element of the array is not
          * within the interval [0, {@code n}).
          */
+        @Override
         public int compare(int[] c1,
                            int[] c2) {
             if (c1.length != k) {

src/main/java/org/apache/commons/math4/util/Decimal64.java

@@ -79,6 +79,7 @@ public class Decimal64 extends Number
      */
 
     /** {@inheritDoc} */
+    @Override
     public Field<Decimal64> getField() {
         return Decimal64Field.getInstance();
     }
@@ -90,6 +91,7 @@ public class Decimal64 extends Number
      * {@code this.add(a).equals(new Decimal64(this.doubleValue()
      * + a.doubleValue()))}.
      */
+    @Override
     public Decimal64 add(final Decimal64 a) {
         return new Decimal64(this.value + a.value);
     }
@@ -101,6 +103,7 @@ public class Decimal64 extends Number
      * {@code this.subtract(a).equals(new Decimal64(this.doubleValue()
      * - a.doubleValue()))}.
      */
+    @Override
     public Decimal64 subtract(final Decimal64 a) {
         return new Decimal64(this.value - a.value);
     }
@@ -111,6 +114,7 @@ public class Decimal64 extends Number
      * The current implementation strictly enforces
      * {@code this.negate().equals(new Decimal64(-this.doubleValue()))}.
      */
+    @Override
     public Decimal64 negate() {
         return new Decimal64(-this.value);
     }
@@ -122,6 +126,7 @@ public class Decimal64 extends Number
      * {@code this.multiply(a).equals(new Decimal64(this.doubleValue()
      * * a.doubleValue()))}.
      */
+    @Override
     public Decimal64 multiply(final Decimal64 a) {
         return new Decimal64(this.value * a.value);
     }
@@ -132,6 +137,7 @@ public class Decimal64 extends Number
      * The current implementation strictly enforces
      * {@code this.multiply(n).equals(new Decimal64(n * this.doubleValue()))}.
      */
+    @Override
     public Decimal64 multiply(final int n) {
         return new Decimal64(n * this.value);
     }
@@ -144,6 +150,7 @@ public class Decimal64 extends Number
      * / a.doubleValue()))}.
      *
      */
+    @Override
     public Decimal64 divide(final Decimal64 a) {
         return new Decimal64(this.value / a.value);
     }
@@ -155,6 +162,7 @@ public class Decimal64 extends Number
      * {@code this.reciprocal().equals(new Decimal64(1.0
      * / this.doubleValue()))}.
      */
+    @Override
     public Decimal64 reciprocal() {
         return new Decimal64(1.0 / this.value);
     }
@@ -232,6 +240,7 @@ public class Decimal64 extends Number
      *
      * @see Double#compareTo(Double)
      */
+    @Override
     public int compareTo(final Decimal64 o) {
         return Double.compare(this.value, o.value);
     }
@@ -305,6 +314,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public double getReal() {
         return value;
     }
@@ -312,6 +322,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 add(final double a) {
         return new Decimal64(value + a);
     }
@@ -319,6 +330,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 subtract(final double a) {
         return new Decimal64(value - a);
     }
@@ -326,6 +338,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 multiply(final double a) {
         return new Decimal64(value * a);
     }
@@ -333,6 +346,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 divide(final double a) {
         return new Decimal64(value / a);
     }
@@ -340,6 +354,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 remainder(final double a) {
         return new Decimal64(FastMath.IEEEremainder(value, a));
     }
@@ -347,6 +362,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 remainder(final Decimal64 a) {
         return new Decimal64(FastMath.IEEEremainder(value, a.value));
     }
@@ -354,6 +370,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 abs() {
         return new Decimal64(FastMath.abs(value));
     }
@@ -361,6 +378,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 ceil() {
         return new Decimal64(FastMath.ceil(value));
     }
@@ -368,6 +386,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 floor() {
         return new Decimal64(FastMath.floor(value));
     }
@@ -375,6 +394,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 rint() {
         return new Decimal64(FastMath.rint(value));
     }
@@ -382,6 +402,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public long round() {
         return FastMath.round(value);
     }
@@ -389,6 +410,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 signum() {
         return new Decimal64(FastMath.signum(value));
     }
@@ -396,6 +418,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 copySign(final Decimal64 sign) {
         return new Decimal64(FastMath.copySign(value, sign.value));
     }
@@ -403,6 +426,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 copySign(final double sign) {
         return new Decimal64(FastMath.copySign(value, sign));
     }
@@ -410,6 +434,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 scalb(final int n) {
         return new Decimal64(FastMath.scalb(value, n));
     }
@@ -417,6 +442,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 hypot(final Decimal64 y) {
         return new Decimal64(FastMath.hypot(value, y.value));
     }
@@ -424,6 +450,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 sqrt() {
         return new Decimal64(FastMath.sqrt(value));
     }
@@ -431,6 +458,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 cbrt() {
         return new Decimal64(FastMath.cbrt(value));
     }
@@ -438,6 +466,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 rootN(final int n) {
         if (value < 0) {
             return new Decimal64(-FastMath.pow(-value, 1.0 / n));
@@ -449,6 +478,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 pow(final double p) {
         return new Decimal64(FastMath.pow(value, p));
     }
@@ -456,6 +486,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 pow(final int n) {
         return new Decimal64(FastMath.pow(value, n));
     }
@@ -463,6 +494,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 pow(final Decimal64 e) {
         return new Decimal64(FastMath.pow(value, e.value));
     }
@@ -470,6 +502,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 exp() {
         return new Decimal64(FastMath.exp(value));
     }
@@ -477,6 +510,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 expm1() {
         return new Decimal64(FastMath.expm1(value));
     }
@@ -484,6 +518,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 log() {
         return new Decimal64(FastMath.log(value));
     }
@@ -491,6 +526,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 log1p() {
         return new Decimal64(FastMath.log1p(value));
     }
@@ -499,6 +535,7 @@ public class Decimal64 extends Number
      * @return base 10 logarithm of the instance
      * @since 3.2
      */
+    @Override
     public Decimal64 log10() {
         return new Decimal64(FastMath.log10(value));
     }
@@ -506,6 +543,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 cos() {
         return new Decimal64(FastMath.cos(value));
     }
@@ -513,6 +551,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 sin() {
         return new Decimal64(FastMath.sin(value));
     }
@@ -520,6 +559,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 tan() {
         return new Decimal64(FastMath.tan(value));
     }
@@ -527,6 +567,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 acos() {
         return new Decimal64(FastMath.acos(value));
     }
@@ -534,6 +575,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 asin() {
         return new Decimal64(FastMath.asin(value));
     }
@@ -541,6 +583,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 atan() {
         return new Decimal64(FastMath.atan(value));
     }
@@ -548,6 +591,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 atan2(final Decimal64 x) {
         return new Decimal64(FastMath.atan2(value, x.value));
     }
@@ -555,6 +599,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 cosh() {
         return new Decimal64(FastMath.cosh(value));
     }
@@ -562,6 +607,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 sinh() {
         return new Decimal64(FastMath.sinh(value));
     }
@@ -569,6 +615,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 tanh() {
         return new Decimal64(FastMath.tanh(value));
     }
@@ -576,6 +623,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 acosh() {
         return new Decimal64(FastMath.acosh(value));
     }
@@ -583,6 +631,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 asinh() {
         return new Decimal64(FastMath.asinh(value));
     }
@@ -590,6 +639,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 atanh() {
         return new Decimal64(FastMath.atanh(value));
     }
@@ -597,6 +647,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 linearCombination(final Decimal64[] a, final Decimal64[] b)
         throws DimensionMismatchException {
         if (a.length != b.length) {
@@ -614,6 +665,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 linearCombination(final double[] a, final Decimal64[] b)
         throws DimensionMismatchException {
         if (a.length != b.length) {
@@ -629,6 +681,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 linearCombination(final Decimal64 a1, final Decimal64 b1,
                                        final Decimal64 a2, final Decimal64 b2) {
         return new Decimal64(MathArrays.linearCombination(a1.value, b1.value,
@@ -638,6 +691,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 linearCombination(final double a1, final Decimal64 b1,
                                        final double a2, final Decimal64 b2) {
         return new Decimal64(MathArrays.linearCombination(a1, b1.value,
@@ -647,6 +701,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 linearCombination(final Decimal64 a1, final Decimal64 b1,
                                        final Decimal64 a2, final Decimal64 b2,
                                        final Decimal64 a3, final Decimal64 b3) {
@@ -658,6 +713,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 linearCombination(final double a1, final Decimal64 b1,
                                        final double a2, final Decimal64 b2,
                                        final double a3, final Decimal64 b3) {
@@ -669,6 +725,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 linearCombination(final Decimal64 a1, final Decimal64 b1,
                                        final Decimal64 a2, final Decimal64 b2,
                                        final Decimal64 a3, final Decimal64 b3,
@@ -682,6 +739,7 @@ public class Decimal64 extends Number
     /** {@inheritDoc}
      * @since 3.2
      */
+    @Override
     public Decimal64 linearCombination(final double a1, final Decimal64 b1,
                                        final double a2, final Decimal64 b2,
                                        final double a3, final Decimal64 b3,

src/main/java/org/apache/commons/math4/util/Decimal64Field.java

@@ -45,16 +45,19 @@ public class Decimal64Field implements Field<Decimal64> {
     }
 
     /** {@inheritDoc} */
+    @Override
     public Decimal64 getZero() {
         return Decimal64.ZERO;
     }
 
     /** {@inheritDoc} */
+    @Override
     public Decimal64 getOne() {
         return Decimal64.ONE;
     }
 
     /** {@inheritDoc} */
+    @Override
     public Class<? extends FieldElement<Decimal64>> getRuntimeClass() {
         return Decimal64.class;
     }

src/main/java/org/apache/commons/math4/util/DefaultTransformer.java

@@ -28,7 +28,6 @@ import org.apache.commons.math4.exception.util.LocalizedFormats;
  * provides some simple conversion capabilities to turn any java.lang.Number
  * into a primitive double or to turn a String representation of a Number into
  * a double.
- *
  */
 public class DefaultTransformer implements NumberTransformer, Serializable {
 
@@ -43,6 +42,7 @@ public class DefaultTransformer implements NumberTransformer, Serializable {
      * cannot successfully be transformed
      * @see <a href="http://commons.apache.org/collections/api-release/org/apache/commons/collections/Transformer.html">Commons Collections Transformer</a>
      */
+    @Override
     public double transform(Object o)
         throws NullArgumentException, MathIllegalArgumentException {
 

src/main/java/org/apache/commons/math4/util/Incrementor.java

@@ -61,7 +61,8 @@ public class Incrementor {
         this(max,
              new MaxCountExceededCallback() {
                  /** {@inheritDoc} */
-                 public void trigger(int max) throws MaxCountExceededException {
+                 @Override
+                public void trigger(int max) throws MaxCountExceededException {
                      throw new MaxCountExceededException(max);
                  }
              });

src/main/java/org/apache/commons/math4/util/MathArrays.java

@@ -727,11 +727,13 @@ public class MathArrays {
         final Comparator<Pair<Double, Integer>> comp
             = dir == MathArrays.OrderDirection.INCREASING ?
             new Comparator<Pair<Double, Integer>>() {
+            @Override
             public int compare(Pair<Double, Integer> o1,
                                Pair<Double, Integer> o2) {
                 return o1.getKey().compareTo(o2.getKey());
             }
         } : new Comparator<Pair<Double,Integer>>() {
+            @Override
             public int compare(Pair<Double, Integer> o1,
                                Pair<Double, Integer> o2) {
                 return o2.getKey().compareTo(o1.getKey());

src/main/java/org/apache/commons/math4/util/MedianOf3PivotingStrategy.java

@@ -36,6 +36,7 @@ public class MedianOf3PivotingStrategy implements PivotingStrategyInterface, Ser
      * first, middle and the last indices of the array slice
      * @throws MathIllegalArgumentException when indices exceeds range
      */
+    @Override
     public int pivotIndex(final double[] work, final int begin, final int end)
         throws MathIllegalArgumentException {
         MathArrays.verifyValues(work, begin, end-begin);

src/main/java/org/apache/commons/math4/util/MultidimensionalCounter.java

@@ -94,6 +94,7 @@ public class MultidimensionalCounter implements Iterable<Integer> {
         /**
          * {@inheritDoc}
          */
+        @Override
         public boolean hasNext() {
             return count < maxCount;
         }
@@ -104,6 +105,7 @@ public class MultidimensionalCounter implements Iterable<Integer> {
          * @throws NoSuchElementException if {@link #hasNext()} would have
          * returned {@code false}.
          */
+        @Override
         public Integer next() {
             if (!hasNext()) {
                 throw new NoSuchElementException();
@@ -156,6 +158,7 @@ public class MultidimensionalCounter implements Iterable<Integer> {
         /**
          * @throws UnsupportedOperationException
          */
+        @Override
         public void remove() {
             throw new UnsupportedOperationException();
         }
@@ -198,6 +201,7 @@ public class MultidimensionalCounter implements Iterable<Integer> {
      *
      * @return the iterator.
      */
+    @Override
     public Iterator iterator() {
         return new Iterator();
     }

src/main/java/org/apache/commons/math4/util/RandomPivotingStrategy.java

@@ -48,6 +48,7 @@ public class RandomPivotingStrategy implements PivotingStrategyInterface, Serial
      * value between first and the last indices of the array slice
      * @throws MathIllegalArgumentException when indices exceeds range
      */
+    @Override
     public int pivotIndex(final double[] work, final int begin, final int end)
         throws MathIllegalArgumentException {
         MathArrays.verifyValues(work, begin, end-begin);

src/main/java/org/apache/commons/math4/util/ResizableDoubleArray.java

@@ -437,6 +437,7 @@ public class ResizableDoubleArray implements DoubleArray, Serializable {
      *
      * @param value Value to be added to end of array.
      */
+    @Override
     public synchronized void addElement(double value) {
         if (internalArray.length <= startIndex + numElements) {
             expand();
@@ -450,6 +451,7 @@ public class ResizableDoubleArray implements DoubleArray, Serializable {
      * @param values Values to be added to end of array.
      * @since 2.2
      */
+    @Override
     public synchronized void addElements(double[] values) {
         final double[] tempArray = new double[numElements + values.length + 1];
         System.arraycopy(internalArray, startIndex, tempArray, 0, numElements);
@@ -475,6 +477,7 @@ public class ResizableDoubleArray implements DoubleArray, Serializable {
      * @return the value which has been discarded or "pushed" out of the array
      * by this rolling insert.
      */
+    @Override
     public synchronized double addElementRolling(double value) {
         double discarded = internalArray[startIndex];
 
@@ -578,6 +581,7 @@ public class ResizableDoubleArray implements DoubleArray, Serializable {
     /**
      * Clear the array contents, resetting the number of elements to zero.
      */
+    @Override
     public synchronized void clear() {
         numElements = 0;
         startIndex = 0;
@@ -757,6 +761,7 @@ public class ResizableDoubleArray implements DoubleArray, Serializable {
      * @throws ArrayIndexOutOfBoundsException if <code>index</code> is less than
      * zero or is greater than <code>getNumElements() - 1</code>.
      */
+    @Override
     public synchronized double getElement(int index) {
         if (index >= numElements) {
             throw new ArrayIndexOutOfBoundsException(index);
@@ -774,6 +779,7 @@ public class ResizableDoubleArray implements DoubleArray, Serializable {
      *  array have no effect on this <code>ResizableArray.</code>
      * @return the double array.
      */
+    @Override
     public synchronized double[] getElements() {
         final double[] elementArray = new double[numElements];
         System.arraycopy(internalArray, startIndex, elementArray, 0, numElements);
@@ -851,6 +857,7 @@ public class ResizableDoubleArray implements DoubleArray, Serializable {
      *
      * @return the number of elements.
      */
+    @Override
     public synchronized int getNumElements() {
         return numElements;
     }
@@ -958,6 +965,7 @@ public class ResizableDoubleArray implements DoubleArray, Serializable {
      * @param value value to store at the specified index
      * @throws ArrayIndexOutOfBoundsException if {@code index < 0}.
      */
+    @Override
     public synchronized void setElement(int index, double value) {
         if (index < 0) {
             throw new ArrayIndexOutOfBoundsException(index);

src/main/java/org/apache/commons/math4/util/TransformerMap.java

@@ -137,6 +137,7 @@ public class TransformerMap implements NumberTransformer, Serializable {
      * transformed into a Double.
      * @see org.apache.commons.math4.util.NumberTransformer#transform(java.lang.Object)
      */
+    @Override
     public double transform(Object o) throws MathIllegalArgumentException {
         double value = Double.NaN;