當按鈕函數在另一個類中時如何使用ActionListener

Question

我有三個不同的類：Main，WindowFrameDimetnions和ValidationOfNumbers。 Main –調用WindowFrameDimetnions。 它是WindowFrameDimetnions的主要類-調用（我正在嘗試調用）ValidationOfNumbers。 這是為程序創建框架，窗格，框標簽和按鈕的類。 ValidationOfNumbers –是進行所有數字驗證的計算的程序。 基本上，此類驗證使用類型輸入的數字在1..100,000范圍內。

目標：目標是通過使用ActionListener將WindowFrameDimetnions與ValidationOfNumbers連接。

package BlueBlueMainFiles;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class WindowFrameDimentions extends JFrame{

    final static int WINDOW_WITH    = 950;//Window with in pixel
    final static int WINDOW_HEIGH   = 650;//Window height in pixel
    static JPanel       panel;//use to reference the panel
    static JLabel       messageLabel;//use to reference the label 
    static JTextField   textField;//use to reference the text field
    static JButton      calcButton;//use to reference the button 

    public WindowFrameDimentions() {
        // TODO Auto-generated constructor stub
    }

    public static void windowFrameDimentions(){
        //create a new window
        JFrame window = new JFrame();

        //add a name to the window
        window.setTitle("BLUE BLUE");

        //set the size of the window
        window.setSize(WINDOW_WITH, WINDOW_HEIGH);

        //specify what happens when the close button is pressed 
        window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //BUILD THE PANEL AND ADD IT TO THE FRAME
        buildPanel();

        //ADD THE PANEL TO THE FRAMES CONTENT PANE
        window.add(panel);

        //Display the window
        window.setVisible(true);
    }

    public static void buildPanel(){
        //create a label to display instructions
        messageLabel = new JLabel("Enter a Number from 1..100,000");

        //create a text field of 10 characters wide
        textField = new JTextField(10);

        //create panel
        calcButton = new JButton("Calculate");


        //Add an action listening to the button. Currently, I can't make it work


        //Create the a JPanel object and let the panel field reference it
        panel = new JPanel();

        panel.add(messageLabel);
        panel.add(textField);
        panel.add(calcButton);

    }
}

現在，這是另一個代碼：

package TheValidationFiles;


public class  ValidationOfNumbers {

    static int MAX_NUMBER_TO_VAL = 10000000;

    public static void GetValidationOfNumbers(boolean isTrue, String s) {

             String[] numberArray = new String [MAX_NUMBER_TO_VAL];
             boolean numberMatching = false;

             for (int i = 0; i < MAX_NUMBER_TO_VAL; i++){
                     numberArray[i] = Integer.toString(i);

                     if (numberArray[i].equals(s)){
                         System.out.println("The number you typed " + s + " Matches with the array value of: " + numberArray[i]);
                         System.exit(0);
                         break;
                     }
                     else{
                         numberMatching = true;
                     }
             }
             if(numberMatching){
                 ValidationOfFiles.ValidationOfFiles(s);
             }
    }

}

Answer 1

您可以嘗試制作一個匿名的AbstractAction：

panel.add(new JButton(new AbstractAction("name of button") {
    public void actionPerformed(ActionEvent e) {
        //do stuff here
    }
}));

Answer 2

希望這應該工作..嘗試將包TheValidationFiles導入WindowFrameDimentions

然后為動作偵聽器編碼

calcButton.addActionListener(new ActionListener(){
  public void actionPerformed(ActionEvent ae){
     ValidationOfNumbers von=new ValidationOfNumbers();
     von.GetValidationOfNumbers(boolean value,string);
  }});

Answer 3

在我看來，您正在嘗試實現類似MVC模式的功能。 在這種情況下，

• 您的Validation類將被視為Model（邏輯和數據）
• 您的Frame類充當View（演示/用戶界面）
• 您的Main類充當Cnotroller（模型和視圖的中間人）

請注意，模型和視圖不應該知道彼此的存在。 它們通過控制器進行通信。

因此，您的Controller（主類）應持有View（框架類）和模型（驗證類）的引用：

//Your controller
public class MainClass{
    private WindowFrameDimentions view;
    private ValidationOfNumbers model;
}

現在，將View鏈接到Controller的關鍵部分：因為您的視圖無法處理邏輯和實現，因此您不必直接在此類中為按鈕的動作監聽器編寫實現代碼，而是只需添加一個方法即可接收ActionListener：

//The view
public class WindowFrameDimentions{
    private JButton calcButton;
    private JTextField textField;    //please use a better name for this

    public WindowFrameDimentions(){
        //Initialize all other required attributes here..
        calcButton = new JButton("Calculate");
    }

    //The controller will create a listener and add to calcButton
    public void addCalcButtonListener(ActionListener listener){
        calcButton.addActionListener(listener)
    }

    //You need a getter for all the input fields such as your JTextFields
    public String getInput(){
        textField.getText();
    }
}

對於您的Validation類，這只是一種簡單的驗證方法，如下所示：

//The model
public class ValidationOfNumbers{

    public ValidationOfNumbers(){
        //Initialize all other required attributes here..
    }

    public boolean validationPassed(String input){
        //your validation code goes here..
    }
}

現在，將所有三個類鏈接在一起，您將擁有：

//The controller
public class MainClass{
    private WindowFrameDimentions view;
    private ValidationOfNumbers model;

    public static void main(String[] args){
        view = new WindowFrameDimentions();
        model = new ValidationOfNumbers();
        view.addCalcButtonListener(new ActionListener(){
            @Override
            public void actionPerformed(ActionEvent e){
                //Now, we can use the Validation class here
                if(model.validationPassed(view.getInput())){  //Linking Model to View
                    //If validation passes, do this
                }
                //Any other actions for calcButton will be coded here
            }
        });
    }
}

這是鏈接所有3個類的總體思路。 通常，實現MVC時，我將擁有4個類而不是3個類，還有1個類來驅動代碼。 但是在此示例中，我使用Controller類來驅動代碼。

還要注意，您實際上應該擴展到JPanel而不是JFrame，然后將擴展類的實例添加到JFrame。