遍历map的方法
方法一：通过map.entrySet(效率较高)

package com.java.call.db;import java.util.HashMap;import java.util.Map;public class SaaMap {public static void main(String args[]){Map map=new HashMap();map.put("a", "1");map.put("b","2");map.put("c", "3");map.put("d", "4");map.put("e", "5");for(java.util.Iterator iter=map.entrySet().iterator();iter.hasNext();){Map.Entry entry=(Map.Entry)iter.next();Object key=entry.getKey();Object val=entry.getValue();System.out.println("key="+key);System.out.println("Value="+val);}}}

方法二：通过map.keySet(相当于二重循环，效率较低)

package com.java.call.db;import java.util.HashMap;import java.util.Map;public class SaaMap {public static void main(String args[]){Map map=new HashMap();map.put("a", "1");map.put("b","2");map.put("c", "3");map.put("d", "4");map.put("e", "5");for (Iterator iter = map.keySet().iterator(); iter.hasNext();) {       Object key = iter.next();       Object val = map.get(key);       System.out.println("key:"+key);       System.out.println("value:"+val);   }}}