字符串、list 排序 comparable

package test; 

import java.util.*; 


public class SortTest { 


 private List<Student> lista = new ArrayList<Student>(); 


 /** 

 * @param args 

 * @CreateDate:2012-10-14 

 * @author 

 */ 

 public static void main(String[] args) { 

 // TODO Auto-generated method stub 

 simpleSort(); 


 SortTest s = new SortTest(); 

 s.listSort(); 

 } 


 /** 

 * 字符串排序，基本用不上 

 * @CreateDate:2012-10-14 

 * @author 

 */ 

 public static void simpleSort(){ 

 String[] strs = {"abb","dfs","adc"}; 


 Arrays.sort(strs); 

 System.out.println(strs[0]+","+strs[1]+","+strs[2]); 

 } 


 /** 

 * list排序 

 * @CreateDate:2012-10-14 

 * @author 

 */ 

 public void listSort(){ 

 this.lista.add(new Student("abb")); 

 this.lista.add(new Student("dfs")); 

 this.lista.add(new Student("adc")); 


 Collections.sort(this.lista); 

 for(Student s:lista){ 

 System.out.println(s.name); 

 } 


 //降序 

 Comparator comp = Collections.reverseOrder(); 

 Collections.sort(this.lista,comp); 

 for(Student s:lista){ 

 System.out.println("降序:"+s.name); 

 } 

 } 


} 


class Student implements Comparable<Student>{ 


 public String name; 


 public Student(String name){ 

 this.name = name; 

 } 


 @Override 

 public int compareTo(Student o) { 

 // TODO Auto-generated method stub 


 return this.name.compareTo(((Student)o).name); 

 } 



} 


结果： 

abb,adc,dfs 

abb 

adc 

dfs 

降序:dfs 

降序:adc 

降序:abb