java.util.Map.Entry无法解析错误

I tried the following code as

我尝试了以下代码

package collectconstructor;
import java.util.Iterator;  
import java.util.Map;  
import java.util.Set;  

public class QuestionMap {

private int id;  
private String name;  
private Map<String,String> answers;  


public QuestionMap(int id, String name, Map<String, String> answers) {  
    super();  
    this.id = id;  
    this.name = name;  
    this.answers = answers;  
}  

public void displayInfo(){  
    System.out.println("question id:"+id);  
    System.out.println("question name:"+name);  
    System.out.println("Answers....");  
    Set<Entry<String, String>> set=answers.entrySet();  
    Iterator<Entry<String, String>> itr=set.iterator();  
    while(itr.hasNext()){  
        Entry entry= itr.next();  
        System.out.println("Answer:"+entry.getKey()+" Posted By:"+entry.getValue());  
    }  
}  

}

Here in the following code snippet

在下面的代码片段中

 Set<Entry<String, String>> set=answers.entrySet();  
 Iterator<Entry<String, String>> itr=set.iterator(); 

I got the error as the

我得到了错误

Multiple markers at this line

此行有多个标记

• The method entrySet() from the type Map refers to the missing type Map$Entry

  类型Map中的方法entrySet()引用缺少的类型Map $ Entry

• Entry cannot be resolved to a type

  无法将条目解析为某种类型

Can anybody explain as Why I am getting this error?

任何人都可以解释为什么我收到此错误?

Also I tried importing

我也试过导入

import java.util.Map.Entry;

but got same error.. please help!!

但得到同样的错误..请帮助!!

1 个解决方案

#1

Try this:

Set<Map.Entry<String, String>> set = answers.entrySet();  
Iterator<Map.Entry<String, String>> itr = set.iterator();  

Here Map.Entry is the sub interface of Map. So we will be accessed it by Map.Entry name. It provides methods to get key and value.

这里Map.Entry是Map的子接口。因此我们将通过Map.Entry名称访问它。它提供了获取密钥和值的方法。