一个实现的类是否可以在其父接口中声明未声明的方法? [英] Can an implemented class have methods NOT declared in its parent interface?

问题描述

我在Eclipse中尝试过此操作，它显示了编译错误.但是，在在线IDE 编译器中尝试相同的操作不会显示任何错误.这就是为什么造成困惑的原因.

I tried this in Eclipse and it shows a compile error. However trying the same in the online IDE Compilr showed no errors. That's why the confusion.

interface Iclass{
  void print();
  void hey();
}

class sdlfkajl implements Iclass {
  public void print(){
    System.out.println("Impl class");
  }
  public void  hey(){
    System.out.println("Hey!");
  }
  public void extra(){
    System.out.println("Should I be here?");
  }
}

显示的错误是此类不能具有未在接口中声明的方法.建议工具提示说我也应该在接口中声明此方法.

The error shown is that this class cannot have methods not declared in the interface. Suggestion tooltip said I should declare this method in the interface too.

推荐答案

您的代码没有错误.

您可能会误将错误警告-可以将IntelliJ设置为将上面的代码标记为警告.

You might be mistaking a warning for an error - IntelliJ can be set to flag the code above as a warning.

您可能还设置了警告，使编译失败.

You might also have a setting for warnings to fail the compile.

所以请检查您的IDE设置！

So check your IDE settings!

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