the arrays index no start with zero, and you enter here 5 element in array, so the last elent index no is 4 and you take loop upto 5 index no hense it raised error array index out of bound int a[]={1,2,3,4,5]; for(inti=0;i<5;i++) System.out.println(a[i]); or for(int i=0;i<=4;i++) or for(int i=0;i