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();      }  }