java的list排序

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import java.util.ArrayList;import java.util.Collections;import java.util.Comparator;import java.util.HashMap;import java.util.List;import java.util.Map;import java.util.Map.Entry;public class Test5 {/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubList<Map<String, String>> list1 = new ArrayList<Map<String, String>>();for (int i = 0; i < 5; i++) {Map<String, String> map1 = new HashMap<String, String>();if (i != 3) {map1.put("a", "" + i);}map1.put("b", "aaa");list1.add(map1);System.out.println("map1,"+i+","+map1.get("a")+","); }Collections.sort(list1, new Comparator<Map<String, String>>() {//  排序public int compare(Map<String, String> o1, Map<String, String> o2) {Map m1 = (Map) o1, m2 = (Map) o2;// 从m1与m2取字段值然后比较，大于返回1，等于返回0，小于返回-1 if (Float.parseFloat("" + m1.get("a")) > Float.parseFloat("" + m2.get("a"))) {return -1;}if (Float.parseFloat("" + m1.get("a")) < Float.parseFloat("" + m2.get("a"))) {return 1;} return 0;}});for (Map<String, String> m : list1) {System.out.println(m.toString());}}}
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