Add missing '@Override' annotations.

src/main/java/org/apache/commons/lang3/concurrent/AbstractCircuitBreaker.java

@@ -49,6 +49,7 @@ public AbstractCircuitBreaker() {
     /**
      * {@inheritDoc}
      */
+    @Override
     public boolean isOpen() {
         return isOpen(state.get());
     }
@@ -56,6 +57,7 @@ public boolean isOpen() {
     /**
      * {@inheritDoc}
      */
+    @Override
     public boolean isClosed() {
         return !isOpen();
     }
@@ -63,16 +65,19 @@ public boolean isClosed() {
     /**
      * {@inheritDoc}
      */
+    @Override
     public abstract boolean checkState();
 
     /**
      * {@inheritDoc}
      */
+    @Override
     public abstract boolean incrementAndCheckState(T increment);
 
     /**
      * {@inheritDoc}
      */
+    @Override
     public void close() {
         changeState(State.CLOSED);
     }
@@ -80,6 +85,7 @@ public void close() {
     /**
      * {@inheritDoc}
      */
+    @Override
     public void open() {
         changeState(State.OPEN);
     }

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

@@ -4289,6 +4289,7 @@ public void testIsSorted() {
     @Test
     public void testIsSortedComparator() {
         final Comparator<Integer> c = new Comparator<Integer>() {
+                @Override
                 public int compare(final Integer o1, final Integer o2) {
                         return o2.compareTo(o1);
                     }

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

@@ -104,6 +104,7 @@ static class TestData{
             this.expected = false;
             this.throwable = throwable;
         }
+        @Override
         public String toString(){
             final StringBuilder sb = new StringBuilder();
             sb.append(source).append("[").append(toffset).append("]");

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

@@ -229,6 +229,7 @@ public void testPerson() {
     @Test
     public void testNestingPerson() {
         final Person p = new Person(){
+            @Override
             public String toString(){
                 return new ToStringBuilder(this).append("name", this.name)
                     .append("age", this.age).append("smoker", this.smoker)

src/test/java/org/apache/commons/lang3/concurrent/EventCountCircuitBreakerTest.java

@@ -379,6 +379,7 @@ public ChangeListener(final Object source) {
             changedValues = new ArrayList<>();
         }
 
+        @Override
         public void propertyChange(final PropertyChangeEvent evt) {
             assertEquals("Wrong event source", expectedSource, evt.getSource());
             assertEquals("Wrong property name", "open", evt.getPropertyName());