Abnormal array

Common array abnormalities:

1, cross-border abnormal array subscript

 2, the array null pointer exception, which NullPointerException is divided into three kinds:

{class Exception1 public 
    public static void main (String [] args) { 
        //. 1, superscripts array bounds exception: java.lang.ArrayIndexOutOfBoundsException 
// int [] I = new new int [10]; 
// I [ 10] = 8; // the index bounds 
// System.out.println (I [10]); 

        // 2, null pointer exception java.lang.NullPointerException 
        // first 
// boolean [] b = new Boolean [. 3]; 
// B = null; // null pointer exception occurs here 
// System.out.println (B [0]); 

        // second 
// String [] str = new String [5] ; 
// str [4] = new new String ( "AA"); // or written str [3] = "AA" , do not write an exception this one will be a null pointer 
// System.out.println (str [4 ] .toString ()); 

        // third 
        int [] [] j = new int [3] [];
        j [1] [0] = 6; // first address is null, not find the specified value 
    } 
}