ObjectReference.java

class ObjectReference {
    int value;

    ObjectReference(int value) {
        this.value = value;
    }

    public static void main(String[] args) {
        ObjectReference obj1 = new ObjectReference(10);
        ObjectReference obj2 = obj1; // obj2 references the same object as obj1

        System.out.println("obj1 value: " + obj1.value); // prints 10
        System.out.println("obj2 value: " + obj2.value); // prints 10

        obj2.value = 20; // modifying obj2 affects obj1

        System.out.println("After modification:");
        System.out.println("obj1 value: " + obj1.value); // prints 20
        System.out.println("obj2 value: " + obj2.value); // prints 20

        obj2 = new ObjectReference(30); // obj2 now references a new object

        System.out.println("After reassignment:");
        System.out.println("obj1 value: " + obj1.value); // still prints 20
        System.out.println("obj2 value: " + obj2.value); // prints 30
    }
}