java 生成随机字符串数组 java生成随机数字字符串

首先，创建一个字符数组-static char num[] = { '0', '1', '2', '3', '4', '5' };

现在，假设您要使用长度为字符串的字符串。创建一个StringBuilder并用于append()从中创建随机数字符串-

int len = 5;
StringBuilder strBuilder = new StringBuilder();
for (int i = 0; i 
strBuilder.append(randomNum());
}

上面，我们创建了一个randomNum()返回随机数字符串的函数-public static char randomNum() {

return num[(int) Math.floor(Math.random() * 5)];
}

示例public class Demo {

static char num[] = { '0', '1', '2', '3', '4', '5' };
public static char randomNum() {
return num[(int) Math.floor(Math.random() * 5)];
}
public static void main(String[] args) {
int len = 5;
StringBuilder strBuilder = new StringBuilder();
for (int i = 0; i 
strBuilder.append(randomNum());
}
System.out.println("Random numbers string = "+strBuilder.toString());
}
}

输出结果Random numbers string = 23024