遍历map键和值的几种方式

package com.Reflect;

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

public class DemoMap {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Map<String,String> map = new LinkedHashMap<String, String>();
map.put("1", "a");
map.put("2", "b");
map.put("3", "c");
Collection<String> c = map.values();
Iterator<String> it = c.iterator();
System.out.println("方式1-------");
while(it.hasNext()){
String temp = it.next();
System.out.println("temp="+temp);
}

Set<Entry<String, String>> set = map.entrySet();
Iterator<Entry<String, String>> itSet = set.iterator();
System.out.println("方式2-------");
while(itSet.hasNext()){
Entry<String, String> entry = itSet.next();
String key = entry.getKey();
String value = entry.getValue();
System.out.println("key="+key+"\t"+"value="+value);
}

System.out.println("方式3------");
Set<String> ketSet = map.keySet();
Iterator<String> itkeySet = ketSet.iterator();
while(itkeySet.hasNext()){
String key = itkeySet.next();
System.out.println("key="+key+"\t"+"value="+map.get(key));
}

}
}