Map的两种遍历

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

public class MapDemo {
public static void main(String args[]){
Map map = new HashMap();
map.put("1","张三");
map.put("2","李四");
map.put("3","王五");

    //keySet()遍历    /*Set keys =  map.keySet();    for (String  key:keys) {         String value =  map.get(key);         System.out.println(key+"  "+value);    }*/    //entrySet()遍历    Set> entrys = map.entrySet();    for (Map.Entry entry:entrys) {        String key =  entry.getKey();        String value = entry.getValue();        System.out.println(key+" "+value);    }}

}