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多选题
public class X {  public X aMethod() { return this;}  }  public class Y extends X {  }  Which two methods can be added to the definition of class Y?()
A

public void aMethod() {}

B

private void aMethod() {}

C

public void aMethod(String s) {}

D

private Y aMethod() { return null; }

E

public X aMethod() { return new Y(); }


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