集合操作

package cn.com.jandar.action.admin;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;public class Test {/** * @param args */public static void main(String[] args) {List<String> list = new ArrayList<String>();list.add("1");list.add("1");list.add("2");list.add("3");list.add("3");Map<String,List<String>> map = new HashMap<String,List<String>>();for(String str : list){if(map.containsKey(str)){map.get(str).add(str+"==value");continue;}List<String> list1 = new ArrayList<String>();list1.add("first");map.put(str, list1);}for (String key : map.keySet()) {for(String str : map.get(key)){System.out.println(str);}}}}