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ObjectPass.java

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package ClassAndObjects;

class PassObjRef {

int a, b;

public PassObjRef(int i, int j) {

a = i;

b = j;

}

// pass an object

// Java always pass object (call-by-reference)

// reference of an object stored in stack area.

void meth(PassObjRef o) {

o.a *= 2;

o.b /= 2;

}

}

class ObjectPass{

public static void main(String args[]) {

PassObjRef ob = new PassObjRef(15, 20);

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

ob.meth(ob);

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

}

}