/**

• 创建完List<String>以后，向其中添加10条字符串
• 每条字符串的长度是10以内的随机整数
• 每条字符串的每个字符都是随机生成的字符，字符可以重复
• 每条随机字符串不可重复
  */

输入代码

public void testsort3() {
    List<String> StringList = new ArrayList<String>();
    Random random = new Random();
    String sbase = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";

    for(int i = 0 ;i < 10 ; i++) {
        String s = new String();
        do {
        int length = random.nextInt(10);
        for(int j = 0 ;j < length ; j++) {
        int num = random.nextInt(sbase.length());
        s+=(sbase.charAt(num));
        }
        }while(StringList.contains(s));
        StringList.add(s.toString());
        System.out.println("成功添加字符串：" + s);

    }
    System.out.println("排序前：");
    for(String string : StringList) {
        System.out.println("元素"+ string);
    }
    Collections.sort(StringList);
    System.out.println("排序后：");
    for(String string : StringList) {
        System.out.println("元素"+ string);
    }   
}