package suanfa;

import java.util.Random;

public class RandomStr {

	public static String getRandomStr(int length) {
		String base = "abcdefghijklmnopqrstuvwxyz0123456789";
		int randomNum;
		char randomChar;
		Random random = new Random();
		// StringBuffer類型的可以append增加字符
		StringBuffer str = new StringBuffer();

		for (int i = 0; i < length; i++) {
			// 可生成[0,n)之間的整數，獲得隨機位置
			randomNum = random.nextInt(base.length());
			// 獲得隨機位置對應的字符
			randomChar = base.charAt(randomNum);
			// 組成一個隨機字符串
			str.append(randomChar);
		}
		return str.toString();
	}

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		System.out.println(getRandomStr(8));
	}

}

【Java算法】獲得一個隨機字符串