List<String> stringList = new ArrayList<String>();

for(int i=0;i<10;i++) {

StringBuilder sb = new StringBuilder();? //用于存儲每一個字符串

int length = (int)(Math.random()*10);? //字符串長度隨機

do {

for(int j=0;j<length;j++) {

int num;

char numChar;

do{

num = (int)(Math.random()*(123-48)+48);? // 隨機生成[48,122]之間的數值

numChar = (char)num;

}while(!(num>=48 && num<=57 || num>=65 && num<=90 || num>=97 && num<=122));? //?字符'0'-'9','A'-'Z','a'-'z'對應的數

sb.append(numChar);

}

}while(stringList.contains(sb.toString()));? //保證字符串不重復

System.out.println("添加第"+(i+1)+"個字符串："+sb.toString());

stringList.add(sb.toString());

}

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);

}