Java Objet and Object Reference Variable

• An object is chunk of memory , and the reference to the object is way to reach up to that object in the memory
• Object reference variable contains address of the object which is declared in the heap memory
• Class Box { double height; double width; double depth; } Box b1; //declare reference ..it will be null b1 = new Box(); //Create an instance assign to reference variable b1 Box b2 = b1; //Only creates reference to this object.. will not create object memory..use same object memory..
• Now I  am going to set some property in b1
• b1.height = 10; b1.width = 20; b1.depth = 30;
• Then I printed b2 properties
• System.out.println(b2.height); System.out.println(b2.width); System.out.println(b2.depth); //output 10 20 30
• I got same values for b2, because it using same memory but different reference