The java.util.Arrays class provides similar “deep” methods for performing equals and hashCode functionality on multi-dimensional arrays: Arrays.deepEquals and Arrays.deepHashCode.

This Java runtime exception happens when the wrong type of object is placed into an array. In the example below, a BigInteger array is created, followed by an attempt to add a Double. The Double does ...

0, 3, null, options, options[0]); The array named options defines the three fields to display in the dialog box. The array is then passed as the seventh of eight parameters required by the JOptionPane ...