集合map 遍历

package com.g.x.nap;

import org.junit.Test;

import java.util.*;

/**
 * @author
 */
public class MapTest {
    @Test
    public void test1(){
        Map map = new HashMap();

        map.put("aa",97);
        map.put("bb",7);
        map.put("cc",9);
        map.put("dd",927);
        System.out.println(map);

    }

    //遍历map
    @Test
    public void test2(){
        Map map = new HashMap();
        map.put("aa",97);
        map.put("bb",7);
        map.put("cc",9);

        //遍历所有key,keyset()
        Set set = map.keySet();
        Iterator iterator = set.iterator();
        while (iterator.hasNext()){
            System.out.println(iterator.next());
        }

        //遍历value值，values()
        Collection values = map.values();
//        Iterator iterator1 = values.iterator();
//        while (iterator1.hasNext()){
//            System.out.println(iterator1.next());
//        }
        for (Object obj:values){
            System.out.println(obj);
        }

        //遍历key ——value entrySet()

        Set entrySet = map.entrySet();
        Iterator iterator2 = entrySet.iterator();
        while (iterator2.hasNext()){
            Object obj = iterator2.next();
            Map.Entry entry = (Map.Entry)obj;
            System.out.println(entry.getKey()+"----"+entry.getValue());
        }

    }

}

最后

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