Reusing Array Variables in Java Examples

Just like simple variables can store different values at different times, an array variable can also be used to store a reference to different arrays at different times. Suppose you have created and initialized array variable num using the following statement,

int[] num = {5,15,25,30,50};

Suppose later on you want to use the array variable num to refer to another array containing 6 elements of int type then you can do this by simply writing the statement,

num = new int[]{10,20,30,40,50,60};

On execution of this statement, the previous array of 5 in t-type elements that is referenced by num is discarded and array variable num now references a new array of 6 values of type int.

public class ReusingArrayVariables  
 { 
           public static void main(String[] args) 
       {  
             int[] num= {5,15,25,30,50}; 
             System.out.println("Elements in Original Array : "); 
             for(int i=0;i<num.length;i++) 
                  System.out.print(num[i]+" "); 
                  System.out.println("\nElements in New Array : "); 
                  num=new int[]{10,20,30,40,50,60}; 
             for(int i=0;i<num.length;i++) 
                  System.out.print(num[i]+" "); 
       } 
 }