Use final, remove redundant call to super(), use valueOf(), lambdas.

src/test/java/org/apache/commons/lang3/ClassUtilsTest.java

@@ -1269,7 +1269,7 @@ public class ClassUtilsTest {
         assertEquals(Inner.DeeplyNested.class, ClassUtils.getClass("org.apache.commons.lang3.ClassUtilsTest$Inner$DeeplyNested", true));
         assertEquals(Inner.DeeplyNested.class, ClassUtils.getClass("org.apache.commons.lang3.ClassUtilsTest$Inner.DeeplyNested", true));
         //
-        ClassLoader classLoader = Inner.DeeplyNested.class.getClassLoader();
+        final ClassLoader classLoader = Inner.DeeplyNested.class.getClassLoader();
         assertEquals(Inner.DeeplyNested.class, ClassUtils.getClass(classLoader, "org.apache.commons.lang3.ClassUtilsTest.Inner.DeeplyNested"));
         assertEquals(Inner.DeeplyNested.class, ClassUtils.getClass(classLoader, "org.apache.commons.lang3.ClassUtilsTest.Inner$DeeplyNested"));
         assertEquals(Inner.DeeplyNested.class, ClassUtils.getClass(classLoader, "org.apache.commons.lang3.ClassUtilsTest$Inner$DeeplyNested"));

src/test/java/org/apache/commons/lang3/ConversionTest.java

@@ -437,7 +437,7 @@ public class ConversionTest {
 
     @ParameterizedTest
     @ValueSource(ints = {-1, 8, 99})
-    public void binaryBeMsb0ToHexDigitPosOutsideArray(int index) {
+    public void binaryBeMsb0ToHexDigitPosOutsideArray(final int index) {
         assertThrows(IndexOutOfBoundsException.class,
             () -> Conversion.binaryBeMsb0ToHexDigit(new boolean[8], index));
     }

src/test/java/org/apache/commons/lang3/EnumUtilsTest.java

@@ -580,7 +580,7 @@ enum Month {
 
     private final int id;
 
-    Month(int id) {
+    Month(final int id) {
         this.id = id;
     }
 

src/test/java/org/apache/commons/lang3/builder/DiffBuilderTest.java

@@ -356,9 +356,9 @@ public class DiffBuilderTest {
     @Test
     public void testObjectsNotSameButEqual() {
         final TypeTestClass left = new TypeTestClass();
-        left.objectField = new Integer(1);
+        left.objectField = Integer.valueOf(1000);
         final TypeTestClass right = new TypeTestClass();
-        right.objectField = new Integer(1);
+        right.objectField = Integer.valueOf(1000);
         assertNotSame(left.objectField, right.objectField);
         assertEquals(left.objectField, right.objectField);
 

src/test/java/org/apache/commons/lang3/exception/CustomCheckedException.java

@@ -22,18 +22,17 @@ public class CustomCheckedException extends Exception {
     private static final long serialVersionUID = 1L;
 
     public CustomCheckedException() {
-        super();
     }
 
-    public CustomCheckedException(String message) {
+    public CustomCheckedException(final String message) {
         super(message);
     }
 
-    public CustomCheckedException(String message, Throwable cause) {
+    public CustomCheckedException(final String message, final Throwable cause) {
         super(message, cause);
     }
 
-    public CustomCheckedException(Throwable cause) {
+    public CustomCheckedException(final Throwable cause) {
         super(cause);
     }
 

src/test/java/org/apache/commons/lang3/exception/CustomUncheckedException.java

@@ -22,18 +22,17 @@ public class CustomUncheckedException extends RuntimeException {
     private static final long serialVersionUID = 1L;
 
     public CustomUncheckedException() {
-        super();
     }
 
-    public CustomUncheckedException(String message) {
+    public CustomUncheckedException(final String message) {
         super(message);
     }
 
-    public CustomUncheckedException(String message, Throwable cause) {
+    public CustomUncheckedException(final String message, final Throwable cause) {
         super(message, cause);
     }
 
-    public CustomUncheckedException(Throwable cause) {
+    public CustomUncheckedException(final Throwable cause) {
         super(cause);
     }
 

src/test/java/org/apache/commons/lang3/function/ConsumersTest.java

@@ -34,11 +34,11 @@ public class ConsumersTest {
     public void testNop() {
         Stream.of("").forEach(Consumers.nop());
         //
-        Consumer<?> c1 = Consumers.nop();
+        final Consumer<?> c1 = Consumers.nop();
         c1.accept(null);
-        Consumer<Object> c2 = Consumers.nop();
+        final Consumer<Object> c2 = Consumers.nop();
         c2.accept(null);
-        Consumer<String> c3 = Consumers.nop();
+        final Consumer<String> c3 = Consumers.nop();
         c3.accept(null);
         //
         Consumers.nop().accept(null);

src/test/java/org/apache/commons/lang3/stream/StreamsTest.java

@@ -143,7 +143,7 @@ public class StreamsTest {
         assertEquals(2, Streams.instancesOf(String.class, Arrays.asList(null, "A", null, "B", null)).collect(Collectors.toList()).size());
         assertEquals(0, Streams.instancesOf(String.class, Arrays.asList(null, null)).collect(Collectors.toList()).size());
         //
-        List<Object> objects = Arrays.asList("A", "B");
+        final List<Object> objects = Arrays.asList("A", "B");
         assertEquals(2, Streams.instancesOf(String.class, objects).collect(Collectors.toList()).size());
     }
 

src/test/java/org/apache/commons/lang3/time/DateFormatUtilsTest.java

@@ -152,8 +152,8 @@ public class DateFormatUtilsTest {
 
     @Test
     public void testLANG1462() {
-        TimeZone timeZone = TimeZone.getTimeZone("GMT-3");
+        final TimeZone timeZone = TimeZone.getTimeZone("GMT-3");
-        Calendar calendar = createJuneTestDate(timeZone);
+        final Calendar calendar = createJuneTestDate(timeZone);
         assertEquals("20030608101112", DateFormatUtils.format(calendar, "yyyyMMddHHmmss"));
         calendar.setTimeZone(TimeZone.getTimeZone("JST"));
         assertEquals("20030608221112", DateFormatUtils.format(calendar, "yyyyMMddHHmmss"));

src/test/java/org/apache/commons/lang3/time/DurationUtilsTest.java

@@ -76,7 +76,7 @@ public class DurationUtilsTest {
 
     @Test
     public void testOfRunnble() {
-        assertTrue(DurationUtils.of(() -> testSince()).compareTo(Duration.ZERO) >= 0);
+        assertTrue(DurationUtils.of(this::testSince).compareTo(Duration.ZERO) >= 0);
     }
 
     @Test