java - 制作按钮类

Question

我遇到的问题是弄清楚如何将我的按钮类链接到我的主程序。我意识到我有很多来自外部类的方法，所以我将尝试给出一个概述。基本上我有一个引号数组列表和一个从字母表的随机排列创建的键。我使用这个 key 来“加密”报价。通过这种方法:

public static String translate ( String text, String key )
    {
        String newText = "";
        for( int i = 0; i < text.length(); i++ )
        {
            char currentLetter = text.charAt( i );
            if( ALPHA.contains( Character.toString( currentLetter ) ) )
            {
                int index = ALPHA.indexOf( currentLetter );
                char newLetter = key.charAt( index );
                newText = newText + text.substring( i, i + 1 ).replace
                    ( currentLetter, newLetter ) ;
            }
            else 
                newText = newText + currentLetter;
        }
        return newText;
    }

所以我想做的是有一个按钮接受用户输入并用该输入替换引号中的字母。我没有使用 JButton，而是使用一个库来制作一个正方形，然后使用 mouseEvent。我在这里把按钮放在一个单独的类中:

import wheelsunh.users.*;
import java.awt.Color;
import java.awt.event.MouseEvent;
import javax.swing.JOptionPane;

/**
 * Creates a button
 * 
 * @author Scott
 */
public class SubstituteButton extends RoundedRectangle
{   
    String response;

    public SubstituteButton( int x, int y )
    {
        super( x, y );
        super.setSize( 20, 20 );
        super.setFillColor( Color.LIGHT_GRAY );
        super.setFrameColor( Color.BLACK );
    }

   public void mousePressed( MouseEvent e )
   {
       super.setFillColor( new Color( 131,111,255 ) );

       try
       {
       response = JOptionPane.showInputDialog( "Which letter"
            + " would you like to replace? Ex. ab would replace all a's"
            + " with b's" );
       }
       catch( NullPointerException exeception )
       {
           JOptionPane.showMessageDialog( null, "Input Error" );
       }

       super.setFillColor( Color.LIGHT_GRAY );     
   }

   public String getInput()
   {
       if( response.length() == 2 && 
          Character.isLetter( response.charAt( 0 ) ) && 
          Character.isLetter( response.charAt( 1 ) ))
       {
           return response;
       }
       return null;
   }
   public static void main( String args[] )
    {
       new Frame();
       new SubstituteButton( 100, 100 );
   }
}

HSo 我将如何更新显示的报价以替换字母？我想我可以在按钮类中使用 replace() 方法，但它不会更新显示的引号。这是主程序:

import wheelsunh.users.*;
import java.util.*;
import java.lang.Character;

/**
 * Displays a quote with letters in blocks and punctuation without blocks.
 * If a letter has been changed from the original then it is highlighted.
 * Displayed lines must be broken to stay on frame.
 * 
 * 
 * @author Scott
 */
public class CryptogramApp extends ShapeGroup
{
    private ArrayList< String > blockQuote;
    private int quoteLength;
    private SubstituteButton substituebutton;
    private boolean newState = true;
    private String key, quote, encryptedQuote;

    /**
     * Creates a block-quote with first letter at initialX,initialY
     * with the text from quote.
     * 
     * @param initialX int
     * @param initialY int
     * @param quote String
     */
    //--------------------------------------------------------------------------
    public CryptogramApp( int initialX, int initialY )
    {         
       if( newState == true )
           newQuote();

       int newx = initialX;

       for( int i = 0; i < quote.length(); i++ )
       {
           String letter = Character.toString( encryptedQuote.charAt( i ) );
           BlockLetter b = new BlockLetter( newx, initialY, letter );
           newx += BlockLetter.WIDTH;

           if( letter.equals(" ") && b.getXLocation() > 400 )
           {
               newx = initialX;
               initialY += 40;
           }
       }
       newState = false;

    }
    public void newQuote()
    {
        blockQuote = new ArrayList<String>();
        key = StringUtilities.getRandomKey();
        quote = getRandomQuote();
        System.out.println( key );
        encryptedQuote = StringUtilities.translate( quote, key );
        System.out.println( encryptedQuote );
        substituebutton = new SubstituteButton( 425, 350 );
    }
    //--------------------------------------------------------------------------
    /**
    * Returns the String text with the jth character replaced with key.
    * 
    * @param text String
    * @param key String
    * @param j int
    * 
    * @return String
    */
    public String getRandomQuote()
    {
        Random gen = new Random();
        ArrayList< String > list = StringUtilities.getQuotes();
        String quote = list.get( gen.nextInt( 6 ) );
        return quote;
    }

    //--------------------------------------------------------------------------
    /**
     * Runs a simple test of CryptogramApp.
     * 
     * @param args String[]
     */
    public static void main( String args[] )
    {
        new Frame( 700, 500 );
        new CryptogramApp( 20, 50 );

    }
}

Answer 1

@MadProgrammer 显然是正确的。为什么你没有子类化 JButton？？

现在你的代码，

不清楚您收到了什么错误，或者什么不适合您。

你应该有

public class SubstituteButton extends RoundedRectangle implements MouseListener

在某个阶段

SubstituteButton button=new SubstituteButton();
button.addMouseListener(button)

?这会将您的按钮连接到监听器。

此外，您要将按钮添加到框架的什么位置？请发布完整的代码。