java - 如何将数组值添加到另一个数组

Question

我正在制作一个随 secret 码生成器，并希望将一个数组值添加到另一个数组“pa”中，以便制作单个字符串密码。任何帮助，将不胜感激。

package project;
 import java.util.Scanner;

import javax.swing.JOptionPane;

import java.util.Random;
public class RandomPass {

public static void Randpass(){
Scanner scan = new Scanner(System.in);
Random rand = new Random();
String[] alphabet=  {"a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"};
JOptionPane.showMessageDialog(null, "Welcome to RandomPassword Generator");
int c= Integer.parseInt(JOptionPane.showInputDialog(null,"How long do you want the password"));
int nc =0-c;
int c2=c/2;
int nc2= 0-c2;
int ncm =(nc+1)/2;
String pa [];
if(c%2==0){
    for(int x=nc2;x<0;x++){
        int alphanum =rand.nextInt(26);
        pa.add(alphabet[alphanum]);
        int numNum =rand.nextInt(10);
        pa.add(numNum);
    }


}else{
    for(int x=ncm;x<0;x++){
        int alphanum =rand.nextInt(26);
        int numNum =rand.nextInt(10);

    }
}

}
}

Answer 1

public class Hello {
private static final String CHAR_LIST = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
private static final int RANDOM_STRING_LENGTH = 10;
    public String generateRandomString(){

        StringBuffer randStr = new StringBuffer();
        for(int i=0; i<RANDOM_STRING_LENGTH; i++){
            int number = getRandomNumber();
            char ch = CHAR_LIST.charAt(number);
            randStr.append(ch);
        }
        return randStr.toString();
    }


    private int getRandomNumber() {
        int randomInt = 0;
        Random randomGenerator = new Random();
        randomInt = randomGenerator.nextInt(CHAR_LIST.length());
        if (randomInt - 1 == -1) {
            return randomInt;
        } else {
            return randomInt - 1;
        }
    }
    public static void main(String[] args) {
        Random rand =  new Random();
        Hello msr = new Hello();
        List<String> list = new ArrayList<String>();
        while(true)
        {
            list.add(msr.generateRandomString());
            //System.out.println("happy birthday smash from "+msr.generateRandomString());
        }
    }

}

我为我的生日做了一些修改，希望我的代码能够工作。快乐编码