java多条件优先级排序 --------- Comparator

Comparator用法代码  

1. package com;   
2.   
3. import java.util.ArrayList;   
4. import java.util.Collections;   
5. import java.util.Comparator;   
6. import java.util.List;   
7.   
8. public class ComparatorDemo {   
9.     public List<Student> mList;   
10.     public List<Comparator<Student>> mCmpList = new ArrayList<Comparator<Student>>();   
11.     public ComparatorDemo(List<Student> list){   
12.         mList = list;   
13.         mCmpList.add(compareAgeASC);   
14.         mCmpList.add(comparePointDESC);   
15.         sort(mList, mCmpList);   
16.     }   
17.     public void sort(List<Student> list, final List<Comparator<Student>> comList) {   
18.         if (comList == null)   
19.             return;   
20.         Comparator<Student> cmp = new Comparator<Student>() {   
21.             @Override   
22.             public int compare(Student o1, Student o2) {   
23.                 for (Comparator<Student> comparator : comList) {   
24.                     if (comparator.compare(o1, o2) > 0) {   
25.                         return 1;   
26.                     } else if (comparator.compare(o1, o2) < 0) {   
27.                         return -1;   
28.                     }   
29.                 }   
30.                 return 0;   
31.             }   
32.         };   
33.         Collections.sort(list, cmp);   
34.     }   
35.   
36.     private Comparator<Student> compareAgeASC = new Comparator<ComparatorDemo.Student>() {   
37.   
38.         @Override   
39.         public int compare(Student o1, Student o2) {   
40.             return o1.age > o2.age ? 1 : -1;   
41.         }   
42.     };   
43.   
44.     private Comparator<Student> comparePointDESC = new Comparator<ComparatorDemo.Student>() {   
45.   
46.         @Override   
47.         public int compare(Student o1, Student o2) {   
48.             return o1.point < o2.point ? 1 : -1;   
49.         }   
50.     };   
51.   
52.     /**   
53.      * @author 80059130  
54.      *    
55.      */   
56.     class Student {   
57.         public int age;   
58.         public String name;   
59.         public int point;   
60.     }   
61. }  

package com;import java.util.ArrayList;import java.util.Collections;import java.util.Comparator;import java.util.List;public class ComparatorDemo {public List<Student> mList;public List<Comparator<Student>> mCmpList = new ArrayList<Comparator<Student>>();public ComparatorDemo(List<Student> list){mList = list;mCmpList.add(compareAgeASC);mCmpList.add(comparePointDESC);sort(mList, mCmpList);}public void sort(List<Student> list, final List<Comparator<Student>> comList) {if (comList == null)return;Comparator<Student> cmp = new Comparator<Student>() {@Overridepublic int compare(Student o1, Student o2) {for (Comparator<Student> comparator : comList) {if (comparator.compare(o1, o2) > 0) {return 1;} else if (comparator.compare(o1, o2) < 0) {return -1;}}return 0;}};Collections.sort(list, cmp);}private Comparator<Student> compareAgeASC = new Comparator<ComparatorDemo.Student>() {@Overridepublic int compare(Student o1, Student o2) {return o1.age > o2.age ? 1 : -1;}};private Comparator<Student> comparePointDESC = new Comparator<ComparatorDemo.Student>() {@Overridepublic int compare(Student o1, Student o2) {return o1.point < o2.point ? 1 : -1;}};/** * @author 80059130 *  */class Student {public int age;public String name;public int point;}}

  1、Comparator

  Collections.sort(List<T> list, Comparator<? super T> c) ;

  2、T实现了Comparable 接口

  Collections.sort(List<T> list);