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// Objects are passed by reference.

class Test {

int a, b;

Test(int i, int j) {

a = i;

b = j;

}

/*

Pass an object. Now, ob.a and ob.b in object used in the call will be changed.

*/

void change(Test ob) {

ob.a = ob.a + ob.b;

ob.b = -ob.b;

}

}

class CallByRef {

public static void main(String args[]) {

Test ob = new Test(15, 20);

System.out.println("ob.a and ob.b before call: " + ob.a + " " + ob.b);

ob.change(ob);

System.out.println("ob.a and ob.b after call: " + ob.a + " " + ob.b);

}

}