- package com.gcj.test;
- import java.text.ParseException;
- import java.util.ArrayList;
- import java.util.Arrays;
- import java.util.Collections;
- import java.util.Comparator;
- import java.util.List;
- /**
- *
- * 排序Test
- * @author youps-a
- * @version $Id: Test.java, v 0.1 2015年5月22日 下午8:04:45 youps-a Exp $
- */
- public class Test {
- @SuppressWarnings({ "unchecked", "rawtypes" })
- public static void main(String[] args) throws ParseException {
- /**排序方法简单使用*/
- List list = Arrays.asList(1,2,3,4,5,6,7,8,9); //定义个list
- System.out.println("原 顺 序"+list.toString());
-
- Collections.shuffle(list);
- System.out.println("打乱顺序"+list.toString());
-
- Collections.sort(list);
- System.out.println("正序排列"+list.toString());
-
- Collections.sort(list, Collections.reverseOrder());
- System.out.println("逆序排列"+list.toString());
-
- /**排序方法复杂使用*/
- List<TestBean> testList = new ArrayList<TestBean>();
- for (int i = 0; i < 10; i++) {
- TestBean testBean = new TestBean();
- testBean.setId(i);
- testBean.setName("name"+i);
- testList.add(testBean);
- }
- //定义一个TestBean 类型的list 并打乱进行测试
- Collections.shuffle(testList);
- for (int i = 0; i < testList.size(); i++) {
- System.out.println("testList乱序 "+testList.get(i).toString());
- }
- System.out.println();
- //根据TestBean 的 id 属性进行排序，需重载实现
- Collections.sort(testList, new Comparator<TestBean>() {
- @Override
- public int compare(TestBean o1, TestBean o2) {
- // 实现正序排列
- return o1.getId().compareTo(o2.getId());
- }
- });
- for (int i = 0; i < testList.size(); i++) {
- System.out.println("testList正序 "+testList.get(i).toString());
- }
- System.out.println();
- //再次打乱顺序
- Collections.shuffle(testList);
- //依旧重载方法
- Collections.sort(testList, new Comparator<TestBean>() {
- @Override
- public int compare(TestBean o1, TestBean o2) {
- // 实现倒序排列
- return o2.getId().compareTo(o1.getId());
- }
- });
- for (int i = 0; i < testList.size(); i++) {
- System.out.println("testList倒序 "+testList.get(i).toString());
- }
- }
-
- }
- //测试bean
- class TestBean {
- //注意需使用 Integer 或Long 等包装类型
- private Integer id;
- private String name;
- public Integer getId() {
- return id;
- }
- public void setId(Integer id) {
- this.id = id;
- }
- public String getName() {
- return name;
- }
- public void setName(String name) {
- this.name = name;
- }
- @Override
- public String toString() {
- // TODO Auto-generated method stub
- return "id:"+this.getId()+",name:"+this.getName();
- }
- }
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