练习三：随机String泛型List生成器及列表排序

package stringsort;

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

//创建完List<String>之后，往其中添加十条随机字符串
//每条字符串的长度为10以内的随机整数
//每条字符串的每个字符都为随机生成的字符，字符可以重复
//每条随机字符串不可重复

public class StringSort {

    public static final String ALLSTRINGS = "1234567890qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM";

    //获得10以内的随机整数
    public int randromInt() {
        Random random = new Random();
        int randromInt = random.nextInt(10);
        return randromInt;
    }

    //生成随机的字符
    public char randromChar() {
        Random random = new Random();
        int index = random.nextInt(62);
        return ALLSTRINGS.charAt(index);
    }

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        List<String> stringList = new ArrayList<String>();
        StringSort  stringSort = new StringSort();
        int i =0;
        while (i < 10) {
            //随机生成字符串长度
            int stringLength = stringSort.randromInt();
            char[] ca = new char[stringLength];
            for (int j = 0; j < ca.length; j++) {
                ca[j] = stringSort.randromChar();
            }
            String str = new String(ca);
            if (stringList.contains(str)) {//判断字符串是否重复
                continue;
            }else {
                stringList.add(str);
                i++;
            }
        }
        System.out.println("---------排序前---------");
        for (String string : stringList) {
            System.out.println(string);
        }
        Collections.sort(stringList);
        System.out.println("---------排序后---------");
        for (String string : stringList) {
            System.out.println(string);
        }
    }
}