Reintroduced @Override as master needs at least Java 7.

src/main/java/org/apache/commons/math4/ode/MultistepFieldIntegrator.java

@@ -388,6 +388,7 @@ public abstract class MultistepFieldIntegrator<T extends RealFieldElement<T>>
         }
 
         /** {@inheritDoc} */
+        @Override
         public void handleStep(FieldStepInterpolator<T> interpolator, boolean isLast)
             throws MaxCountExceededException {
 
@@ -431,6 +432,7 @@ public abstract class MultistepFieldIntegrator<T extends RealFieldElement<T>>
         }
 
         /** {@inheritDoc} */
+        @Override
         public void init(final FieldODEStateAndDerivative<T> initialState, T finalTime) {
             // nothing to do
         }

src/main/java/org/apache/commons/math4/ode/nonstiff/AdamsMoultonFieldIntegrator.java

@@ -370,12 +370,14 @@ public class AdamsMoultonFieldIntegrator<T extends RealFieldElement<T>> extends
         }
 
         /** {@inheritDoc} */
+        @Override
         public void start(int rows, int columns,
                           int startRow, int endRow, int startColumn, int endColumn) {
             Arrays.fill(after, getField().getZero());
         }
 
         /** {@inheritDoc} */
+        @Override
         public void visit(int row, int column, T value) {
             if ((row & 0x1) == 0) {
                 after[column] = after[column].subtract(value);