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public class Parent{     public void change(int x){} }  public class Child extends Parent{     //覆盖父类change方法  }  下列哪个声明是正确的覆盖了父类的change方法?() 

  • A、 protected void change(int x){}
  • B、 public void change(int x, int y){}
  • C、 public void change(String s){}
  • D、 public void change(int x){}

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更多 “ public class Parent{     public void change(int x){} }  public class Child extends Parent{     //覆盖父类change方法  }  下列哪个声明是正确的覆盖了父类的change方法?() A、 protected void change(int x){}B、 public void change(int x, int y){}C、 public void change(String s){}D、 public void change(int x){}” 相关考题
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考题 单选题程序:  class TestReference{  public static void main(String[] args){   int x=2;  TestReference tr = new TestReference();          System.out.print(x);          tr.change(x);  System.out.print(x);  }  public void change(int num){      num = num + 1; } }  程序运行后的输出是哪项?()A  23B  21C  22D  编译错误