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class A {
...
}
class B extends A {
...
}
class C extends B {
...
}
public class MyClass {
public static void main (String args []) {
A x1 = new A ();
B x2 = new B ();
C x3 = new C ();
x1 = x3;
x2 = x3;
System.out.println (x1.equals (x2) && x1.equals (x3));
}
}