Java.20

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

public class ss {
    public static void main(String[] args) {
        Map<String,String> map=new HashMap();
        map.put("亚亚","Q妹");
        map.put("菲菲","Q妹");
        map.put("欧欧","Q仔");
        map.put("美美","Q妹");
        Set<String> keyset = map.keySet();
        Iterator<String> iter = keyset.iterator();
        while (iter.hasNext()){
            String key = iter.next();
            String value = map.get(key);
            System.out.println(key+"	"+value);
        }


    }


}

　　

 

在上机3的基础上，为企鹅添加一个编号，并作为键存储多个企鹅信息到应用泛型的HashMap集合 使用Iterator、foreach语句进行遍历

　　

　　

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

public class ss {
    public static void main(String[] args) {
        Map<String,String> map=new HashMap();
        map.put("亚亚","Q妹");
        map.put("菲菲","Q妹");
        map.put("欧欧","Q仔");
        map.put("美美","Q妹");
        Set<String> keyset = map.keySet();
        Iterator<String> iter = keyset.iterator();
        while (iter.hasNext()){
            String key = iter.next();
            String value = map.get(key);
            System.out.println(key+"	"+value);
        }

        System.out.println("使用foreach遍历");
        for (String key : keyset) {
            String value = map.get(key);
            System.out.println(key+"	"+value);
        }
    }


}