import tester.*;

class ExamplesSame {
	public ExamplesSame() {}
	
	A test1 = new A();
	A test2 = new B();

	// make sure our tester knows the difference between these two objects
	public boolean testSameTester(Tester t) {
		return t.checkFail(test1, test2) &&
		       t.checkFail(test2, test1);
	}
	
	// check if the comparison works in once direction
	public boolean testSame12(Tester t) {
		return 
		t.checkExpect(test1.same(test2), false, "comparing test1 and test2");
	}
	
	// check if the comparison works in the other direction as well
	public boolean testSame21(Tester t) {
		return 
		t.checkExpect(test2.same(test1), false, "comparing test2 and test1");
	}
	
}

class A {
	int n1;

	public A(){
		n1 = 4;
	}
	
	public boolean same(Object o) {
		if (!(o instanceof A)) {
			return false;
		} else {
			A rhs = (A) o;
			return this.n1 == rhs.n1;
		}
	}
}

class B extends A { 
	  int n2;
	  public B(){
		  super();
		  n2 = 8;
	  }
	  public boolean same(Object o) {
	    if (!(o instanceof B)) {
	      return false;
	    } else {
	      B rhs = (B)o;
	      return this.n1 == rhs.n1 && this.n2 == rhs.n2;
	    }
	  }
	}

/*
Tester Results
ExamplesSame:
---------------
...  
   new ExamplesSame:1(
    this.test1 =     
     new A:2(
      this.n1 = 4)
    this.test2 =     
     new B:3(
      this.n1 = 4
      this.n2 = 8))
---------------
Found 3 test methods
....
Ran 4 tests.
1 test failed.

Test results: 
--------------

Error in test number 3
comparing test1 and test2
tester.ErrorReport: Error trace:
	at ExamplesSame.testSame12(TestSame.java:18)

actual:     true
expected:   false

--- END OF TEST RESULTS ---
*/