JAVA随机字符串

package Strings;

import java.util.Random;
import java.util.UUID;

public class 随机字符 {




    public static void main(String[] args) {
        String uuid = UUID.randomUUID().toString().replace("-", "");
        //随机一个长度为32的字符串
        System.out.println(uuid.toString());
        System.out.println(random(32));
        for (int i = 48; i < 199; i++) {
        //输入常用字符 
            System.out.print((char) i);
        }

        System.out.println("\n一个随机的汉字:" + (char) (new Random().nextInt(20901) + 19968));

        // for (int i = 0; i < 65536; i++) {
        // //打印所有字符
        // System.out.println((char) i);
        // }
    }

    private static StringBuffer random(int length) {
        // 返回指定长度的随机的a-z 0-9 A-Z 的字符串
        Random z = new Random();

        String Str = "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        StringBuffer n = new StringBuffer();
        for (int i = 0; i < length; i++) {
            n.append(Str.charAt(z.nextInt(Str.length())));
        }
        return n;
    }
    private static char getRandomCharacter(char start, char end) {
        return (char) (ch1 + Math.random() * (ch2 - ch1 + 1));
        //随机返回一个指定范围内的字符
    }
}