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class One {   public One foo() { return this; }  }  class Two extends One {  public One foo() { return this; }  }  class Three extends Two {   // insert method here  }  Which two methods, inserted individually, correctly complete the Three class?()

发布日期:2020-04-10

class One {   public One foo() { return this; }  }...
A

public void foo() { }

B

public int foo() { return 3; }

C

public Two foo() { return this; }

D

public One foo() { return this; }

E

public Object foo() { return this; }

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