Java集合LinkedHashMap

LinkedHashMap

HashMap的子类
与LinkedList相同，内部采用双向链表

元素的迭代顺序，与存入顺序一致

package bhz.aio;

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

public class List {
    public static void main(String[] args) {
        Map map = new LinkedHashMap();
        map.put("1", "111");
        map.put("2", "222");
        map.put("3", "333");
        Set keySet = map.keySet();
        Iterator it = keySet.iterator();
        while (it.hasNext()) {
            Object key = it.next();
            Object value = map.get(key);
            System.out.println(key+":"+value);
        }
    }
}

运行