java在代码中生成随机数字和ID的两个方法

import java.util.UUID;
import java.util.Random;
public class randomID {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
        UUID uuid = UUID.randomUUID();
        String randomId = uuid.toString();
        System.out.println("随机 ID: " + randomId);
        String randomId2 = generateRandomId();
        System.out.println("随机 ID: " + randomId2);
	}

    public static String generateRandomId() {
        long timestamp = System.currentTimeMillis();
        Random random = new Random();
        int randomNumber = random.nextInt(10000);
        return timestamp + "_" + randomNumber;
    }
}