Map遍历

==============方法一===========================

import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.Iterator;
public class Test{

 public static void  main (String[] args){
  Map<String,String> map = new HashMap<String,String>();
  map.put("1","zx1");
  map.put("2","zx2");
  map.put("3","zx3");
  map.put("4","zx4");
  Set<String> test= map.keySet();
  Iterator<String> iterator = test.iterator();
   while(iterator.hasNext()){
   String key = iterator.next();
   String value= map.get(key);
   System.out.println("键："+key+"值："+value);
  }
 }
}

结果：

E:\test>java Test
键：3值：zx3
键：2值：zx2
键：1值：zx1
键：4值：zx4

==================方法二======================

import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.Iterator;
import java.util.Map.Entry;
public class Test{

 public static void  main (String[] args){
  Map<String,String> map = new HashMap<String,String>();
  map.put("1","zx1");
  map.put("2","zx2");
  map.put("3","zx3");
  map.put("4","zx4");
  
  Iterator<Map.Entry<String, String>> iterator = map.entrySet().iterator();//使用entry
   while(iterator.hasNext()){
   Map.Entry<String, String> entry  = iterator.next();
   System.out.println("键："+entry.getKey()+"值："+entry.getValue());
  }
 }
}

结果：

E:\test>java Test
键：3值：zx3
键：2值：zx2
键：1值：zx1
键：4值：zx4