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ArrayIndexOutOfBoundsException - Examples, Causes & Fixes. An array-index out of bounds exception is a Java exception thrown due to the fact that the program is trying to access an. element at a position that is outside an array limit, hence the words Out of bounds. In other words, the program is trying to. access an element at an index that is outside the array bounds.
Via polymorphism, any subclass of Object can be substituted for Object. Since Object is the common root class of all the Java's classes, a collection designed to hold Object can hold any Java classes. There is, however, one problem. Suppose, for example, you wish to define an ArrayList of String. In the add(Object) operation, the String will be upcasted implicitly into Object by the compiler. During retrieval, however, it is the programmer's responsibility to downcast the Object back to an String explicitly.