Java实例练习——java实现自动生成长度为10以内的随机字符串（可用于生成随机密码）

package sorttest;

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

public class SortTest {
	
	
	public void sortString() {
		List<String> stringList = new ArrayList<String>();
		
		char[] charAndnum = "1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz".toCharArray();
		Random random = new Random(); //用于产生随机数
		for (int j = 0; j < 10; j++) {
			String string = new String();
			do{
				int sLength = random.nextInt(10);
				
				for(int i = 0;i<((sLength==0)?1:sLength);i++){
					string+= charAndnum[random.nextInt(51)];
				}
				}while(stringList.contains(string));
				stringList.add(string);
		}
		System.out.println("---------------排序前---------------");
		for (String str : stringList) {
			
			System.out.println("生成的字符串为："+str);
		}
		Collections.sort(stringList);
		
		System.out.println("---------------排序后---------------");
		for (String str : stringList) {
			
			System.out.println("生成的字符串为："+str);
		}
	}

	public static void main(String[] args) {
		// TODO Auto-generated method stub
	SortTest sTest = new SortTest();
	sTest.sortString();
	}

}

package oop;


import java.io.IOException;
import java.nio.CharBuffer;
import java.util.Random;
import java.util.Scanner;

public class PassWrodsCreater implements Readable {

    private static Random random = new Random(47);
    private static final char[] alls = 
            "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ@#!$%*&/".toCharArray();
    // 生成字密码的数量
    private int count;
    // 生成密码长度
    private int length;
    public PassWrodsCreater(int count,int length) {
        this.count = count;
        this.length = length;
    }
    @Override
    public int read(CharBuffer cb) throws IOException {
        if(count-- == 0)
            return -1;
        for(int i = 0; i < length; i++){
            cb.append(alls[random.nextInt(alls.length)]);
        }
        cb.append(" ");
        return 0;
    }
    
    public static void main(String[] args) {
        Scanner sc = new Scanner(new PassWrodsCreater(3,9));
        while(sc.hasNext())
            System.out.println(sc.next()); 
    }

}