Java中的ActionListeners

Question

好吧，所以我有兩個類沒有真正相互關聯。 一個是輸入中的圖形（通過終端使用掃描儀）。我想用一個JTextField來代替掃描儀，但我有一個很難這樣做..

林有點丟在這裏....

這裏是一流的GUI

//Constructor to create the UI components 
public UnoGraphics() { 

    //JButtons---------------------------- 
    viewCards = new JButton("Move Card"); 
    input = new JTextField(5); 

    //Creates a canvas and set the properties 
    canvas = new DrawCanvas(); 
    canvas.setPreferredSize(new Dimension(CANVAS_WIDTH,CANVAS_HEIGHT)); 
    this.setContentPane(canvas); 
    this.setDefaultCloseOperation(EXIT_ON_CLOSE); 


//This is How I was thinking of implementing my input------------HERE----------------> 
    input.addActionListener(new ActionListener() { 
     public void actionPerformed(ActionEvent e) { 
      inputText = input.getText(); 
     }});//End ActionListener() 

    this.pack(); 
    this.setTitle("Uno!"); 
    this.setVisible(true); 
}//End Constructor 

//Custom drawing canvas (designed as inner class). This is were we draw/change the cards 
    class DrawCanvas extends JPanel { 
    // Custom drawing codes-------------- 
    @Override 
    public void paintComponent(Graphics g) { 

     //Set the background to black 
     super.paintComponent(g); 
     setBackground(Color.black); 
    //cards being drawn------------------- 
    //buttons and text fields 
    add(viewCards); 
    add(input); 
    }//End PaintComponent() 
    }//End DrawCavas() 
}//End Program 

二班使用掃描儀的輸入：

public class CommandLinePlayer extends Player 
    { 


//private String inputText; 
// constructor 
public CommandLinePlayer(String aname) 
{ 
    //super aname is from the super class player; 
    super(aname); 

} 


    // command line player can also say uno. This uses scanner(reads user in puts from keyboard) and the response should be typed in 
    public boolean sayUno() 
    { 
     System.out.println("Would you like to say uno? Yes or No"); 
     Scanner scan = new Scanner(System.in); 
     String yes = scan.next(); 
     // returns response 
     //returns yes if the user types yes and ignores the case 
     return yes.equalsIgnoreCase("Yes"); 
    } 

    //this method is the choose card of type int takes int one argument of type Card 
    // command line version (normal player on command line) 
    //this method takes in the card from your hand and "sends" it to the controller 
    protected int chooseCard(Card topCard) 
    { 
     // display hand 
     System.out.println("\nHere is the topCard: " + topCard); 

     System.out.println("Your hand has:"); 

     // loops through the players(commandlineplayer) hand and prints out the players cards. Index could start at 0, but 1 would be the first card 
     for(int index = 0; index < numOfCards; index ++) 
     { 
      System.out.println("Card # " + index + ": " + hand[index]); 

     } 
     // choose Card prompts the player to match, or pick a card based on the index, and then press enter. 
     // if a card does not match the topcard, a key corresponding to any card can be pressed. This would automatically add a 
     // card to a players hand. 
     System.out.println("Play a card #. If you don't have a card to play, choose any card # to draw."); 
     Scanner scan = new Scanner(System.in); 
     int num = scan.nextInt(); 
     return num; 

    } 


    // this is the choose color method for the command line player but only if it is a wild card does this method takes place 
    // command line player can choose a cards color based on the options displayed on the screen.(System.out.println...statements) 
    public Card.Color chooseColor() 
    { 
     // choose a color using scanner 
     Scanner scanin = new Scanner(System.in); 

     System.out.println("Choose a color by pressing a number corresponding to your choice:"); 

     System.out.println("Your options are 1.Red 2.Green 3.Yellow 4. Blue"); 

     // the switch corresponds a number (color) to the cases, and returns a chosen card. 
     int color = 0; 
     color = scanin.nextInt(); 
     switch (color) 
     { 
      case 1: System.out.println("The color you chose is: Red"); 
        return Card.Color.Red; 
      case 2: System.out.println("The color you chose is: Green"); 
        return Card.Color.Green; 
      case 3: System.out.println("The color you chose is: Yellow"); 
        return Card.Color.Yellow; 
      case 4: System.out.println("The color you chose is: Blue"); 
        return Card.Color.Blue; 
      default: System.out.println("NONE"); 
     } 

      return Card.Color.None;   
    } 

    public class inputListener implements ActionListener { 
     public void actionPerformed(ActionEvent event) { 
      //I Was Thinking something like this-----------HERE----- 
     } 
    } 
    } 

Answer 1

以下是您需要的相關代碼塊，您應該能夠將它們自己整合到您的代碼中。

public class Controller { 
    public void startMethod() { 
     final UIClass myUI = new UIClass(); 
     myUI.addActionListener(new ActionListener() { 
      @Override 
      public void actionPerformed(ActionEvent ae) { 
       handleUIInformation(myUI); 
      } 
     } 
    } 

    private void handleUIInformation(UIClass myUI) { 
     String textval = myUI.textField.getText(); 
     // here you do whatever you want with the text 
    } 
} 

public class UIClass { 
    JButton button; 
    JTextField textField; 
    public UIClass() { 
     button = new JButton(); 
     textField = new JTextField(); 
     textField.addKeyListener(new KeyAdapter() { 
      @Override 
      public void keyPressed(KeyEvent e) { 
       if(e.getKeyCode() == KeyEvent.VK_ENTER) { 
        button.doClick(); 
       } 
      } 
     }); 
    } 

    public void addActionListener(ActionListener al) { 
     button.addActionListener(al); 
    } 
}