當按鈕功能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。主要 - 調用WindowFrameDimetnions。它是主類 WindowFrameDimetnions - 調用（以及我試圖調用）ValidationOfNumbers。這是爲程序創建框架的類，窗格，框的標籤和按鈕。 ValidationOfNumbers - 是進行數字驗證所有計算的人員。基本上這個類驗證用戶輸入的數字在1..100,000的範圍內。

目標： 我們的目標是通過使用一個ActionListener與ValidationOfNumbers WindowFrameDimetnions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，這是其他代碼：

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

你可以嘗試做一個匿名AbstractAction：

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

Answer 2

也希望這應該work..try進口包TheValidationFiles到WindowFrameDimentions

然後代碼爲actionlistener

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

Answer 3

在我看來，你正試圖實現類似於MVC模式的東西。在這種情況下，

• 你的驗證類將被視爲模型（邏輯和數據）
• 你鏡框類充當視圖（呈現/用戶界面）
• 主類充當Cnotroller （中間人模型和視圖）

請注意，模型和視圖不應該知道彼此的存在。他們通過控制器進行通信。

因此您的控制器（主類）應該持有視圖（Frame類）和模型（Validation類）的參考：

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

現在關鍵的部分，以查看鏈接到你的控制器：因爲你的觀點 不處理的邏輯和實現，因此你不代碼對於這個類按鈕的動作偵聽器的直接執行，而不是，只需添加一個方法來獲得一個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(); 
    } 
} 

爲了您的驗證類，它會只是一個簡單的方法來驗證這樣的：

//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，所有3類連接在一起，你有：

//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 
      } 
     }); 
    } 
} 

這是連接所有3類的總體思路。通常，在實現MVC時，我會有4個類而不是3個，而另外有1個類驅動代碼。但在這個例子中，我使用Controller類來驅動代碼。

另請注意，實際上應該擴展到JPanel而不是JFrame，然後將擴展類的實例添加到JFrame中。