Returning Objects

Returning Objects

• We can return an object from a method. The data type for such method is a class type.

Java Program[ObjRetDemo.java]

public class ObjRetDemo {

int a;

ObjRetDemo(int val)

{

a=val;

}

ObjRetDemo fun()

{

ObjRetDemo temp = new ObjRetDemo (a+5); //created a new object return temp; //returning the object from this method

}

}

class ObjRet {

public static void main(String args[])

{

ObjRetDemo obj2=new ObjRetDemo (20);

ObjRetDemo obj1;

obj1=obj2.fun();//obj1 gets the value from object temp System.out.println("The returned value is = "+obj1.a);

}

}

Output

F:\test>javac ObjRetDemo.java

F:\test>java ObjRet

The returned value is = 25

Ex. 2.3.1: Write Java program for computing Fibonacci series.

Sol.:

/******************************************************************

Program for computing the number in the fibonacci series at certain location. For example the eighth number in fibonacci series will be 21. The fibonacci series is 1 1 2 3 5 8 13 21 34...

*****************************************************************/

import java.io.*;

import java.util.*;

class Fibonacci

{

public int fib(int n)

{

int x,y;

}

if(n<=1)

return n;

x=fib(n-1);

y=fib(n-2);

return (x+y);

}

}//end of class

class FibonacciDemo

{

public static void main(String[] args) throws IOException

{

Fibonacci f= new Fibonacci();

int n=8;

System.out.println("\nThe number at "+n+" is "+f.fib(n));

}

}

Output

D:\>javac FibonacciDemo.java

D:\>java FibonacciDemo

The number at 8 is 21