+Reports classes which implement java.lang.Comparable
+which do not override equals(). If equals()
+is not overridden, the equals() implementation is not consistent with
+the compareTo() implementation. If an object of such a class is added
+to a collection such as java.util.SortedSet, this collection will violate
+the contract of java.util.Set, which is defined in terms of
+equals().
+
For example:
+
+ class Length implements Comparable<Length> {
+ private int cm = 0;
+ @Override
+ public int compareTo(@NotNull Length o) {
+ if (cm == o.cm) return 0;
+ return cm < o.cm ? -1 : 1;
+ }
+ }
+After the quick fix is applied, the result looks like this:
+
+ class Length implements Comparable<Length> {
+ private int cm = 0;
+
+ @Override
+ public int compareTo(@NotNull Length o) {
+ if (cm == o.cm) return 0;
+ return cm < o.cm ? -1 : 1;
+ }
+
+ @Override
+ public boolean equals(Object o) {
+ return o instanceof Length && compareTo((Length) o) == 0;
+ }
+ }
+