java进阶随机数

package com.lu.day06.homework;

import java.util.ArrayList;
import java.util.Random;

public class RandomTest {
    public static void main(String[] args) {
        ArrayList<char[]> c = new ArrayList<>();
        for (int j = 0; j < 10; j++) {
            char[] chars = new char[6];
            for (int i = 0; i < 6; i++) {
                Random random = new Random();
                int number = random.nextInt(48, 58);
                int capitalLetter = random.nextInt(65,91);
                int lowercaseLetter = random.nextInt(97,123);
                switch (random.nextInt(1, 4)) {
                    case 1 -> chars[i] = (char) number;
                    case 2 -> chars[i] = (char) capitalLetter;
                    case 3 -> chars[i] = (char) lowercaseLetter;
                }
            }
            c.add(chars);
        }
        c.forEach(t->{
            for (char value : t) {
                System.out.println(value);
            }
            System.out.println("-------");
        });

    }
}