8.3 Returning Objects from Methods
Like any other data datatype, a method can returns object. For example, in the following program, the makeTwice( ) method returns an object in which the value of instance variable is two times than it is in the invoking object.
Program (Sample.java)
/**
* This program demonstrates how a method can return
* a reference to an object.
*/
public class Sample
{
private int value;
public Sample(int i)
{
value = i;
}
/**
* The makeTwice method returns a Sample object
* containing the value twice the passed to it.
*/
public Sample makeTwice()
{
Sample temp = new Sample(value * 2);
return temp;
}
public void show()
{
System.out.println("Value : " + value);
}
}
Program (ReturnObjectDemo.java)
public class ReturnObjectDemo
{
public static void main(String[] args)
{
Sample obj1 = new Sample(10);
Sample obj2;
// The makeTwice method returns a reference
obj2 = obj1.makeTwice();
obj2.show();
}
}
Output :
Value : 20
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