Java生成随机数字和字母组合的7位数

package nickname;

import java.util.Random;

public class nickname {


public static String getRandomNickname(int length) {
String val = "";

Random random = new Random();

for (int i = 0; i < length; i++) {
// 输出字母还是数字

String charOrNum = random.nextInt(2) % 2 == 0 ? "char" : "num";

// 字符串

if ("char".equalsIgnoreCase(charOrNum)) {
// 取得大写字母还是小写字母

int choice = random.nextInt(2) % 2 == 0 ? 65 : 97;

val += (char) (choice + random.nextInt(26));

} else if ("num".equalsIgnoreCase(charOrNum)) { // 数字

val += String.valueOf(random.nextInt(7));

}

}

return val;

}

public static void main(String[] args) {
System.out.println("java生成随机数字和字母组合7位数：" + getRandomNickname(7));

}

}