entry 遍历 Map 元素

1、书写类

import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;

public class test {
　　public static  void main(String args[]){
        Map<String,String> dateMap = new HashMap<String,String>();
        dateMap.put("small","sun");
        dateMap.put("king","wang");
        dateMap.put("sun","shine");
        for(Entry<String,String> dateEntry:dateMap.entrySet()){
            String key = dateEntry.getKey();
            String value=dateEntry.getValue();
            System.out.print("dateMap的key:"+key+"\t");
            System.out.println("dateMap的value:"+value);
        }
    }
}

2、结果

"C:\Program Files\Java\jdk1.8.0_181\bin\java.exe"...
dateMap的key:small	dateMap的value:sun
dateMap的key:sun	dateMap的value:shine
dateMap的key:king	dateMap的value:wang

Process finished with exit code 0