Exception?in?thread?"main"?java.lang.IndexOutOfBoundsException:?Index?4?out-of-bounds?for?length?4 at?java.base/jdk.internal.util.Preconditions.outOfBounds(Unknown?Source) at?java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Unknown?Source) at?java.base/jdk.internal.util.Preconditions.checkIndex(Unknown?Source) at?java.base/java.util.Objects.checkIndex(Unknown?Source) at?java.base/java.util.ArrayList.get(Unknown?Source) at?imooc_collection_map_demo/com.imooc.collection.SetTest.testAdd(SetTest.java:34) at?imooc_collection_map_demo/com.imooc.collection.SetTest.main(SetTest.java:58)
2019-03-05
數組下標越界
testAdd的參數index的最大值是數組長度-1??