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Rectangle.java

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package chapter09;

// ReferenceEx1.java

// Using Object and Reference

// http://www.c4learn.com/java/java-assigning-object-reference/

class Rectangle {

double length;

double breadth;

}

class ReferenceEx1

{

public static void main(String args[]) {

Rectangle r1 = new Rectangle();

Rectangle r2 = r1;

// r2 is called a reference of type Rectangle

// It can be considered as a copy of r11

r1.length = 10;

r2.length = 50;

System.out.println("Value of r1's Length : " + r1.length);

// Used Object here

System.out.println("Value of r1's Length : " + r2.length);

// Used reference to the object here

System.out.println("The object r1 is located at: " + System.identityHashCode(r1));

System.out.println("The reference r2 is located at: " + System.identityHashCode(r2));

r1 = null; // Enforcing the object r1 to null

System.out.println("Value of r1's Length : " + r2.length);

// Used reference to the object here

System.out.println("The object r1 is located at: " + System.identityHashCode(r1));

System.out.println("The reference r2 is located at: " + System.identityHashCode(r2));

Rectangle r3 = new Rectangle();

}

}