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Null pointer exception

Discussion in 'Java' started by bsudhir6, Sep 19, 2010.

  1. bsudhir6

    bsudhir6 New Member

    Joined:
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    Code:
    package Obj1_3_1_4;
    public class ArrEx
    {
        // Arrays are can be declared like this
        int[] a;
        int b[];
        int[][] c;
        int[] d[][];
        String[] S;// Array of string class objects
        public static void main(String[] args)
        {
            int i=0,j=0,k=0;
            ArrEx AE=new ArrEx();
            
            for(i=0;i<10;i++)
            {
                AE.a[i]=6;
                AE.b[i]=44;
            }
            for(i=0;i<10;i++)
            for(j=0;j<10;j++)
            AE.c[i][j]=644;
            
            for(i=0;i<10;i++)
            for(j=0;j<10;j++)
            for(k=0;k<10;k++)
            AE.d[i][j][k]=1;
            
            for(i=0;i<10;i++)
            AE.S[i]="S";
            
            for(i=0;i<10;i++)
            {
                System.out.println(AE.a[i]);
                System.out.println(AE.b[i]);
            }
            
        for(i=0;i<10;i++)
            for(j=0;j<10;j++)
            System.out.println(AE.c[i][j]);
            
            for(i=0;i<10;i++)
            for(j=0;j<10;j++)
            for(k=0;k<10;k++)
            System.out.println(AE.d[i][j][k]);
            
            for(i=0;i<10;i++)
            System.out.println(AE.S[i]);
        }
    }
    This program compiles fine and...the output while executing is
    Exception in thread "main" java.lang.NullPointerException
    at Obj1_3_1_4.ArrEx.main(ArrEx.java:20)

    Please help...
     

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