应根据密码中需要的字符数生成随机密码。它确实创建了一个密码,但显示为密码: null bjkalhmmglmhb。不确定为什么会出现null,但仍会创建密码。
import java.util.Random;
//26 letters in alpha
public class PasswordRandomizer {
int length, position;
String password;
Random random;
public PasswordRandomizer(int length) {
this.length = length;
random = new Random();
for (int counter = 0; counter < this.length; counter++) {
position = random.nextInt(length - 1);
char symbol = "abcdefghijklmnopqrstuvwxyz".charAt(position);
this.password = "" + this.password + symbol;
}
}
public String createPassword() {
return this.password;
}
}
public class Main {
public static void main(String[] args) {
PasswordRandomizer randomizer = new PasswordRandomizer(13);
System.out.println("Password: " + randomizer.createPassword());
}
}
答案 0 :(得分:0)
这是null initialy:String password;
,然后你将字符串连接到这个空变量 - 不好。使用StringBuilder或首先将String初始化为非null值,然后将字符串连接到它:String password = "";
会这样做。