import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Random;

public class CollectionsTest {

?public List<String> stringList=new ArrayList<String>();
?
?/*
? * Collections.sort()方法排序
? * 1.添加隨機十條字符串
? * 2.每條字符串的長度為不超過10的整數
? * 3.每條字符串的字符隨機生成，字符可以重復
? * 4.字符串不可以重復
? */
?
?public void testSort3(){
??Random random=new Random();
??for(int i=0;i<10;i++){
???String base="0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
???//隨機長度小于10的字符串
???char[] k=new char[random.nextInt(10)];
???for(int j=0;j<k.length;j++){
????k[j]=base.charAt(random.nextInt(base.length()));
???}
???//將Char[]裝進string
???String string=String.valueOf(k);
???//字符串不重復，就添加
???do{
????stringList.add(string);
???}while(stringList.equals(string));

??}
??//遍歷輸出
??System.out.println("********排序前*********");
??for (String string: stringList) {
???System.out.println("元素:"+string);
??}
??//排序字符串
??Collections.sort(stringList);
??//遍歷輸出
??System.out.println("********排序后*********");
??for (String string: stringList) {
???System.out.println("元素:"+string);
??}
?}
?
?public static void main(String[] args) {
??CollectionsTest ct=new CollectionsTest();
??ct.testSort3();
?}

}