比较<字符串>必须覆盖超类方法 [英] Comparator<String> must override super class method

问题描述

我正在制作一个 TreeMap< String，String> ，并希望以降序排列。我创建了以下比较器：

I'm making a TreeMap<String, String> and want to order it in a descending fashion. I created the following comparator:

Comparator<String> descender = new Comparator<String>() {

    @Override
    public int compare(String o1, String o2) {
        return o2.compareTo(o1);
    }
};

我构造了TreeMap，如下所示：

I construct the TreeMap like so:

myMap = new TreeMap< String，String>（descender）;

然而，我得到以下错误：

However, I'm getting the following error:

The method compare(String, String) of type new Comparator<String>(){} must override a superclass method

我从来没有完全摸索泛型，我做错了什么？

I've never fully groked generics, what am I doing wrong?

推荐答案

您的Eclipse项目显然设置为Java 1.5。接口方法确实不支持 @Override 注释。删除该注释或将项目的合规级别修复到Java 1.6。

Your Eclipse project is apparently set to Java 1.5. The @Override annotation is then indeed not supported on interface methods. Either remove that annotation or fix your project's compliance level to Java 1.6.

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