Question

我正在尝试理解和学习如何从一个简单的ifBD输入到使用JOption输入/消息功能。原始代码如下：

导入java.util.Scanner;

公共课Guess2 {

public static void main(String[] args) 
{
    //keyboard scanner
    Scanner keyBd = new Scanner( System.in );

    //declare variables
int myGuess;
    final int NUMBER_TO_GUESS = 13;

//show introductory message
    System.out.print("\nWelcome to Guess-My-Number\nA GAME of CHANCE and SKILL\nLet's Play!\n\n");

//prompt to enter guess  
    System.out.print("Enter a number between 1 and 25: ");    
myGuess = keyBd.nextInt();
while( myGuess != NUMBER_TO_GUESS)
    {  
      //good or bad guess??
  if(myGuess < NUMBER_TO_GUESS) //too low
    System.out.printf("Your guess [ %d ] is too low...\nTry Again!\n", myGuess);
  else  //too high
    System.out.printf("Your guess [ %d ] is too high...\nTry Again!\n", myGuess);

    //prompt to enter guess  
        System.out.print("\nEnter a number between 1 and 25: ");    
    myGuess = keyBd.nextInt();
    }//end while

  //good guess
    System.out.printf(
        "Your guess [ %d ] is the number...\nCongratulations!\n", 
        myGuess);

}//end main()

} //结束猜测1

我需要用JOptionPane替换keyBD输入，并用JOptionPane替换打印输出。我也知道，输入的任何内容都作为字符串完成，必须转换为int。我想我已经接近了，但是我不知道该转换语句。这是我更新的代码

import javax.swing.JOptionPane;

公共课Guess2 {

public static void main(String[] args) 
{
    //declare variables
  final int NUMBER_TO_GUESS = 13;


//show introductory message
    JOptionPane.showMessageDialog(null, "\nWelcome to Guess-My-Number\nA GAME of CHANCE and SKILL\nLet's Play!\n\n");

//prompt to enter guess  
  JOptionPane.showInputDialog(null, "Enter a number between 1 and 25: ");
  int myGuess = nextInteger.parseInt(myGuess);  

  while( myGuess != NUMBER_TO_GUESS)

    { 

      //good or bad guess??
    if(myGuess < NUMBER_TO_GUESS) 
    //too low
    JOptionPane.showMessageDialog(null, "Your guess [ %d ] is too low...\nTry Again!\n", myGuess);
    else//too high
    JOptionPane.showMessageDialog(null, "Your guess [ %d ] is too high...\nTry Again!\n", myGuess);

    //prompt to enter guess  
    JOptionPane.showInputDialog(null, "Enter a number between 1 and 25: ");
  int myGuess = nextInteger.parseInt(myGuess);     

    }//end while

  //good guess
    JOptionPane.showMessageDialog(null, "Your guess [ %d ] is the number...\nCongratulations!\n", myGuess);

}

Answer 1

JOptionPane.showInputDialog(null, "Enter a number between 1 and 25: ");
int myGuess = nextInteger.parseInt(myGuess);

如何转换“ myGuess”？您是从哪里获得初始“ myGuess”值的？

好答案是您可以从选项窗格中获得答案。阅读JOPtionPane API，以获取有关如何使用showInputDialog(...)方法的信息。您将看到该方法返回一个值。因此，您需要将String转换为int：

String answer = (String)JOptionPane.showInputDialog(null, "Enter a number between 1 and 25: ");
int myGuess = nextInteger.parseInt(answer);

阅读How to Make Dialogs的Swing教程中的部分，以获取更多信息和工作示例。

Answer 2

这是我最终为了编译和执行的代码。作为Java的新手，如果您提出的问题将来可能会导致我出现问题或不是最佳实践，那么我会对反馈感兴趣。谢谢。

import javax.swing.JOptionPane;

公共课Guess2 {

public static void main(String[] args) 
{
    //declare variables
  String answer;
  int myGuess;
  final int NUMBER_TO_GUESS = 13;


//show introductory message
    JOptionPane.showMessageDialog(null, "\nWelcome to Guess-My-Number\nA GAME of CHANCE and SKILL\nLet's Play!\n\n");

//prompt to enter guess  
  answer = JOptionPane.showInputDialog(null, "Enter a number between 1 and 25: ");
  myGuess = Integer.parseInt(answer);  

  while( myGuess != NUMBER_TO_GUESS)

    { 

      //good or bad guess??
    if(myGuess < NUMBER_TO_GUESS) 
    //too low
    JOptionPane.showMessageDialog(null, "Your guess is too low...\nTry Again!\n");
    else//too high
    JOptionPane.showMessageDialog(null, "Your guess is too high...\nTry Again!\n");

    //prompt to enter guess  
    answer = JOptionPane.showInputDialog(null, "Enter a number between 1 and 25: ");
  myGuess = Integer.parseInt(answer);     

    }//end while

  //good guess
    JOptionPane.showMessageDialog(null, "Your guess is the number...\nCongratulations!\n");

}

将keyBd输入转换为JOption输入，并将printf，println转换为JOption消息

2 个答案: