求帮忙看下这段代码为什么有时候会生成一个空的字符串添加到stl集合里？
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public void testSort3(){ String string = "1234567890ABCDEFGHIJKLMNOPQRSTUVWXYabcdefghijklmnopqrstuvwxyz"; List stl = new ArrayList();Random random = new Random(); for(int j = 0;j < 10;j++){ char e; String st = ""; for(int i = 0;i < random.nextInt(string.length());i++){ //判断stl是否包含上一个生成的字符串，如果为true， //则重新循环生成，如果为false，则添加到stl do{ e = string.charAt(random.nextInt(string.length())); st = st + e; }while(stl.contains(st)); } stl.add(st); } System.out.println("----------排序前---------"); for (String string2 : stl) { System.out.println("字符串："+string2); } Collections.sort(stl); System.out.println("----------排序后---------"); for (String string2 : stl) { System.out.println("字符串："+string2); } }输出结果：----------排序前---------字符串：1YeO69qEpz字符串：Ox8EHbOcmmunkF字符串：GajsKoNIq79字符串：LJJwdreXtL4hr字符串：YAxE字符串：VtpRe0MFa字符串：62pxdYnYuGI9jObYphtDH字符串：字符串：dWR02Q字符串：KavtY2r----------排序后---------字符串：字符串：1YeO69qEpz字符串：62pxdYnYuGI9jObYphtDH字符串：GajsKoNIq79字符串：KavtY2r字符串：LJJwdreXtL4hr字符串：Ox8EHbOcmmunkF字符串：VtpRe0MFa字符串：YAxE字符串：dWR02Q |
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因为do-while循环是先执行一次再进行判断，可以改成while循环运行试下看下结果 |
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