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