1 List<User> students = new ArrayList<User>(); 2 3 User user1 = new User(); 4 user1.setAge(112); 5 user1.setUserName("小米"); 6 user1.setMoney(118.55); 7 students.add(user1); 8 9 User user2 = new User(); 10 user2.setAge(82); 11 user2.setUserName("小王"); 12 user2.setMoney(88.55); 13 students.add(user2); 14 15 User user3 = new User(); 16 user3.setAge(100); 17 user3.setUserName("小李"); 18 user3.setMoney(110.65); 19 students.add(user3); 20 21 User user4 = new User(); 22 user4.setAge(99); 23 user4.setUserName("小赵"); 24 user4.setMoney(99.5); 25 students.add(user4); 26 27 Collections.sort(students, new Comparator<User>() { 28 @Override 29 public int compare(User o1, User o2) { 30 //降序 31 /*if(o1.getMoney()>o2.getMoney()){ 32 return -1; 33 } 34 if(o1.getMoney()<o2.getMoney()){ 35 return 1; 36 } 37 return 0;*/ 38 39 //升序 40 if(o1.getMoney()>o2.getMoney()){ 41 return 1; 42 } 43 if(o1.getMoney()<o2.getMoney()){ 44 return -1; 45 } 46 return 0; 47 48 /*int i = o1.getAge() - o2.getAge(); 49 return i;*/ 50 } 51 }); 52 for(User stu : students){ 53 System.out.println("score:" + stu.getUserName() + ":age:" + stu.getAge()+":money:"+stu.getMoney()); 54 }
简单类型list排序
1 List<Integer> nums = new ArrayList<Integer>(); 2 nums.add(3); 3 nums.add(5); 4 nums.add(1); 5 nums.add(0); 6 System.out.println(nums); 7 Collections.sort(nums); 8 System.out.println(nums);
list集合随机显示（实体类）
1 List<Integer> list = new ArrayList<Integer>(); 2 for (int i = 0; i < 5; i++) { 3 list.add(i); 4 } 5 Collections.shuffle(list); 6 for(Integer yy:list){ 7 System.out.println("随机："+yy); 8 }