Java Eclipse @Override错误

问题描述

我正在编写一个实现名为Command的接口的Java类，它包含方法 isValid（）和 run（），如下所示：

  public class DailyEnergy implements Command {
 
 @Override 
 public boolean isValid（String command）{
 return false; 
} 
 
 @Override 
 public void run（String command）throws异常{
} 
} 
  

，这里是Command.java文件：

  public interface Command {
 
 public boolean isValid（String command）; 
 public void run（String command）throws异常; 
} 
  

在这个类中，我正在实现超类方法 isValid（）和 run（），我想添加 @Override 注释，但是Eclipse提供了一个错误，指出这些方法必须覆盖超类方法。

即使我拿出方法并使用Eclipse自动导入，如果我添加注释，我得到错误。如果有人可以看出为什么我不能使用 @Override 注释，那将是非常感激的。

解决方案

Java-6支持界面实现上的 @Override 注释。你可能在Java-5上吗？ Oracle 在。它已经。见下面的例子：

I'm writing a Java class that's implementing an interface called Command, which contains the methods isValid() and run(), as follows:

public class DailyEnergy implements Command {

  @Override
  public boolean isValid(String command) {
    return false;
  }

  @Override
  public void run(String command) throws Exception {
  }
}

and here's the Command.java file:

public interface Command {

  public boolean isValid(String command);
  public void run(String command) throws Exception;
}

Within this class, I'm implementing the superclass methods isValid() and run(), and I want to add the @Override annotation, but Eclipse gives an error saying that "the methods must override superclass methods".

Even when I take out the methods and import them automatically with Eclipse, if I add the annotation, I get the error. If anyone can shed some light as to why I can't use the @Override annotation, that would be greatly appreciated.

解决方案

The @Override annotation on interface implementations is supported since Java-6. Are you possibly on Java-5? Oracle has acknowledged a mess-up in the Java 6 docs. It has been corrected in Java-7. See example below:

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