Question

LinkedHashMap到底是有序还是无序

Answer 1

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

public class Demo{
public static void main(String[] args) {
Map m = new HashMap();
m.put("001","张三");
m.put("005","李四");
m.put("003","王一");
Set s = m.keySet();
Iterator it = s.iterator();
System.out.println("map里面的元素为：");
while(it.hasNext()){
String a = (String)(it.next());
String b = (String)(m.get(a));
System.out.println(a+" "+b);
}
}
}
我改了你的代码，但是我的结果是李四张三王一