There are a few classes
Which of the next method should be inserted in Class4 to compile without error?

Question

There are a few classes  Which of the next method should be inserted in Class4 to compile without error?

Answer

Class2 method() { return new Class1(); }

Answer

Class3 method() { return null; }

Answer

Class1 method() { return null; }

Answer

Class2 method() { return null; }

Answer

Class3 method(int t) { return null; }

Answer

Class2 method() { return new Class2(); }

Answer

Class3 method() { return new Class2(); }

Answer

Class1 method() { return new Class2(); }

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