无法解析java.util.Map $ Entry类型。它是从所需的.class文件间接引用的 [英] The type java.util.Map$Entry cannot be resolved. It is indirectly referenced from required .class files

问题描述

我在Eclipse上编写一个简单的Java程序。

  import java.util.HashMap; 
 
 public class Demo {
 public static void main（String [] args）{
 HashMap< String，String> hash = new HashMap（）; 
} 
} 
  

上述程序会产生以下错误。 >

1. 该项目由于其构建路径不完整而未构建。找不到java.util.Map $ Entry的类文件。修复构建路径，然后尝试构建此项目。


2. 无法解析java.util.Map $ Entry类型。它是从所需的.class文件间接引用的。

我几乎遍布互联网搜索，但我无法纠正这一点。

我已经安装了Java SE 8u5（JDK）（ http://www.oracle.com/technetwork/java/javase/downloads/index.html?ssSourceSiteId=otnjp ）

1. Windows - >首选项 - >已安装的JRE显示

a）jdk C：\Program文件\Java\jdk

1. 项目 - >构建路径 - >库显示

a）JRE系统库（jdk）

b）JRE系统库（jre8）

请有人帮助我。

编辑：将Eclipse版本从Helios更改为Juno解决了问题！

解决方案

我已经看到Eclipse forg偶尔出现的问题存在内置类（包括 Object 和 String ）。解决方法是：

• 在项目菜单上，关闭自动生成


• 退出并重新启动Eclipse


• 在项目菜单上，选择清除...并清除所有项目


• 将自动构建这样可以让Eclipse重新生成所有的东西。

>

I am writing a simple Java program on Eclipse.

import java.util.HashMap;

public class Demo {
    public static void main(String[] args) {
        HashMap<String, String> hash = new HashMap();
    }
}

The above program generates the following errors.

1. The project was not built since its build path is incomplete. Cannot find the class file for java.util.Map$Entry. Fix the build path then try building this project.
2. The type java.util.Map$Entry cannot be resolved. It is indirectly referenced from required .class files.

I searched over the internet almost everywhere, but I was not able to correct this.

I have installed Java SE 8u5 (JDK) (http://www.oracle.com/technetwork/java/javase/downloads/index.html?ssSourceSiteId=otnjp)

1. Windows -> Preferences -> Installed JREs shows

a) jdk C:\Program Files\Java\jdk

1. Project -> Build Path -> Libraries shows

a) JRE system library (jdk)

b) JRE system library (jre8)

Please somebody help me.

EDIT: Changing Eclipse version from Helios to Juno solved the problem!

解决方案

I've seen occasional problems with Eclipse forgetting that built-in classes (including Object and String) exist. The way I've resolved them is to:

• On the Project menu, turn off "Build Automatically"
• Quit and restart Eclipse
• On the Project menu, choose "Clean…" and clean all projects
• Turn "Build Automatically" back on and let it rebuild everything.

This seems to make Eclipse forget whatever incorrect cached information it had about the available classes.

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