Java中的GUI问题。请帮忙。谢谢

问题描述

我已经制作了这段代码，输出应该显示一个要求输入密码的对话框。然后，如果用户正确输入它，则显示有效。否则它显示无效。然而它唯一不好的对话框输入密码。它没有显示是否有效。我犯了什么错？非常感谢。


PS：我还是java的初学者


这是我写的代码片段：


导入javax.swing。*;

import java.awt。*;

import java .awt.event。*;

import java.util.Arrays;


公共类GeographyQuiz_Menu

{



public static void main（String [] args）

{

JFrame jFrame;

jFrame = new JFrame（）;


>

JOptionPane.showMessageDialog（jFrame，" This is a Geography Quiz"）;

JOptionPane.showMessageDialog（null，Good Luck）;



String yourChoice;

char choice;

int i，choice1;


int密码;

扫描仪键盘=新扫描仪（System.in）;

JOptionPane.showInputDialog（jFrame，输入密码）;


密码= keyboard.nextInt（）;


if（密码== 123）

{

JOptionPane.showMessageDialog（null，有效。您输入了正确的密码。现在从以下菜单中选择）;


}

else

{

JOptionPane.showMessageDialog（null，" Invalid Password。再试一次。）;


}

}

}

解决方案

import javax.swing。*;

import java.awt。*;

import java.awt.event。*;

import java.util。*;



公共类GeographyQuiz_Menu

{



public static void main（String [] args）

{

JFrame jFrame;

jFrame = new JFrame（）;



JOptionPane.showMessageDialog（jFrame，" This is a Geography Quiz"）;

JOptionPane.showMessageDialog（null，祝你好运）;


String yourChoice;

char choice;

int i，choice1;


int密码;

字符串passString;

扫描仪键盘=新扫描仪（System.in）;


passString = JOptionPane.showInputDialog （输入密码）;


//密码= passString.nextInt（）;

密码= Integer.parseInt（passString ）;



if（密码== 123）

{

JOptionPane.showMessageDialog（null，"有效。您输入了正确的密码。现在从以下菜单中选择）;


}

else

{

JOptionPane。 showMessageDialog（null，无效密码。再试一次。）;


}

}

}

随时欢迎;）

I have made this piece of code where the output should display a dialogue box asking for a password. Then if the user enters it correctly it displays "Valid" or else it displays "Not Valid". However its only dispalying the dialogue box to enter the password. It isn''t displaying whether its valid or not. What have i made wrong? Thanks a lot.

PS: I''m still a beginner in java

This is the piece of code i have written:


import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Arrays;


public class GeographyQuiz_Menu
{


public static void main(String[] args)
{
JFrame jFrame;
jFrame = new JFrame();



JOptionPane.showMessageDialog(jFrame, "This is a Geography Quiz");
JOptionPane.showMessageDialog(null, "Good Luck");


String yourChoice;
char choice;
int i, choice1;

int Password;
Scanner keyboard = new Scanner(System.in);
JOptionPane.showInputDialog(jFrame, "Enter the Password");

Password = keyboard.nextInt();

if (Password == 123)
{
JOptionPane.showMessageDialog(null, "Valid. You typed the right password. Now choose from the following menu");

}
else
{
JOptionPane.showMessageDialog(null, "Invalid Password. Try Again.");

}
}
}

解决方案

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;


public class GeographyQuiz_Menu
{


public static void main(String[] args)
{
JFrame jFrame;
jFrame = new JFrame();



JOptionPane.showMessageDialog(jFrame, "This is a Geography Quiz");
JOptionPane.showMessageDialog(null, "Good Luck");


String yourChoice;
char choice;
int i, choice1;

int Password;
String passString;
Scanner keyboard = new Scanner(System.in);

passString = JOptionPane.showInputDialog("Enter the Password");


//Password = passString.nextInt();
Password = Integer.parseInt(passString);


if (Password == 123)
{
JOptionPane.showMessageDialog(null, "Valid. You typed the right password. Now choose from the following menu");

}
else
{
JOptionPane.showMessageDialog(null, "Invalid Password. Try Again.");

}
}
}

ur welcome anytime ;)

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