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问如何使txPanel仅在单击“enter pin ok”按钮后可见？
EN

Stack Overflow用户

提问于 2012-03-13 15:36:39

回答 3查看 518关注 0票数 1

public class ATMgui extends JFrame implements ActionListener {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    public static final int WIDTH = 500;
    public static final int HEIGHT = 200;
    private ATMbizlogic theBLU;// short for the Business Logic Unit
    public JLabel totalBalanceLabel;
    public JTextField withdrawTextField;
    public JTextField depositTextField;
    public JTextField pinTextField;

    /**
     * Creates a new instance of ATMgui
     */
    public ATMgui() {
        setTitle("ATM Transactions");
        setSize(WIDTH, HEIGHT);
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        Container contentPane = getContentPane();
        contentPane.setBackground(Color.BLACK);
        contentPane.setLayout(new BorderLayout());


        // Do the panel for the rest stop
        JLabel start = new JLabel("Welcome To Your Account", JLabel.CENTER);
        Font curFont = start.getFont();
        start.setFont(new Font(curFont.getFontName(), curFont.getStyle(), 25));
        start.setForeground(Color.BLUE);
        start.setOpaque(true);
        start.setBackground(Color.BLACK);


        pinTextField = new JTextField();
        JLabel pinLabel = new JLabel("Enter your PIN below:", JLabel.CENTER);
        pinLabel.setForeground(Color.RED);
        pinLabel.setOpaque(true);
        pinLabel.setBackground(Color.WHITE);



        JButton pinButton = new JButton("Enter Pin OK");
        pinButton.addActionListener(this);
        pinButton.setBackground(Color.red);

        JPanel pinPanel = new JPanel();
        pinPanel.setLayout(new GridLayout(3, 1, 100, 0));

        pinPanel.add(pinLabel);
        pinPanel.add(pinTextField);
        pinPanel.add(pinButton);

        contentPane.add(pinPanel, BorderLayout.WEST);


        JPanel headingPanel = new JPanel();
        headingPanel.setLayout(new GridLayout());
        headingPanel.add(start);

        contentPane.add(headingPanel, BorderLayout.NORTH);


        // Do the panel for the amount & type of transactions
        withdrawTextField = new JTextField();
        JLabel withdrawLabel = new JLabel("Withdraw (0.00)", JLabel.CENTER);
        withdrawLabel.setForeground(Color.RED);
        withdrawLabel.setOpaque(true);
        withdrawLabel.setBackground(Color.WHITE);



        depositTextField = new JTextField();
        JLabel depositLabel = new JLabel("Deposit (0.00)", JLabel.CENTER);
        depositLabel.setForeground(Color.RED);
        depositLabel.setOpaque(true);
        depositLabel.setBackground(Color.WHITE);



        JButton txButton = new JButton("Transactions OK");
        txButton.addActionListener(this);
        txButton.setBackground(Color.red);




        JPanel txPanel = new JPanel();
        txPanel.setLayout(new GridLayout(5, 1, 30, 0));

        txPanel.add(withdrawLabel);
        txPanel.add(withdrawTextField);
        txPanel.add(depositLabel);
        txPanel.add(depositTextField);
        txPanel.add(txButton);

        contentPane.add(txPanel, BorderLayout.EAST);
        txPanel.setVisible(true);


        totalBalanceLabel = new JLabel("Your balance after transactions: ", JLabel.CENTER);
        totalBalanceLabel.setForeground(Color.BLUE);
        totalBalanceLabel.setOpaque(true);
        totalBalanceLabel.setBackground(Color.BLACK);


        contentPane.add(totalBalanceLabel, BorderLayout.SOUTH);


        theBLU = new ATMbizlogic();
    }

    public void actionPerformed(ActionEvent e) {
        String actionCommand = e.getActionCommand();

        // Container contentPane = getContentPane();

        if (actionCommand.equals("Transactions OK")) {
            try {
                double deposit = Double.parseDouble(depositTextField.getText().trim());
                double withdraw = Double.parseDouble(withdrawTextField.getText().trim());
                theBLU.computeBalance(withdraw, deposit);
                totalBalanceLabel.setText("Your balance after transactions: " + theBLU.getBalance());

            } catch (ATMexception ex) {
                totalBalanceLabel.setText("Error: " + ex.getMessage());
            } catch (Exception ex) {
                totalBalanceLabel.setText("Error in deposit or withdraw amount: " + ex.getMessage());
            }
        } else if (actionCommand.equals("Enter Pin OK")) {

            try {

                double pin = Double.parseDouble(pinTextField.getText().trim());
                theBLU.checkPin(pin);

                totalBalanceLabel.setText("Your balance after transactions: " + theBLU.getBalance());



            } catch (ATMexception ex) {
                totalBalanceLabel.setText("Error: " + ex.getMessage());
            } catch (Exception ex) {
                totalBalanceLabel.setText("Error in pin: " + ex.getMessage());

            }
        } else {
            System.out.println("Error in button interface.");
        }
    }

    public static void main(String[] args) {
        ATMgui gui = new ATMgui();
        gui.setVisible(true);
    }
}

java

swing

applet

jbutton

actionlistener

回答 3

Stack Overflow用户

回答已采纳

发布于 2012-03-13 22:28:41

由于你粘贴的代码不起作用，我为你做了一个小程序，看一看，看看你能做些什么来把它合并到你的案例中：

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class PanelTest extends JFrame
{
    private JPanel eastPanel;

    public PanelTest()
    {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationByPlatform(true);

        Container container = getContentPane();

        eastPanel = new JPanel();
        eastPanel.setBackground(Color.DARK_GRAY);

        JPanel westPanel = new JPanel();
        westPanel.setBackground(Color.YELLOW);

        JPanel centerPanel = new JPanel();
        centerPanel.setBackground(Color.BLUE);

        container.add(eastPanel, BorderLayout.LINE_START);
        container.add(centerPanel, BorderLayout.CENTER);
        container.add(westPanel, BorderLayout.LINE_END);
        eastPanel.setVisible(false);

        JButton showButton = new JButton("Click Me to Display EAST JPanel");
        showButton.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent ae)
            {
                eastPanel.setVisible(true);
            }
        });

        JButton hideButton = new JButton("Click Me to Hide EAST JPanel");
        hideButton.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent ae)
            {
                eastPanel.setVisible(false);
            }
        });

        container.add(hideButton, BorderLayout.PAGE_START);
        container.add(showButton, BorderLayout.PAGE_END);

        setSize(300, 300);
        setVisible(true);
    }

    public static void main(String... args)
    {
        SwingUtilities.invokeLater(new Runnable()
        {
            public void run()
            {
                new PanelTest();
            }
        });
    }
}

从将来开始，永远不要将NORTH、EAST、WEST和SOUTH用于BorderLayout。它们分别被PAGE_START、LINE_START、LINE_END和PAGE_END所取代。

BorderLayout对象有五个区域。这些区域由BorderLayout常量指定：

PAGE_START
PAGE_END
LINE_START
LINE_END
CENTER

版本说明:在JDK1.4之前，不同区域的首选名称是不同的，从指南针的指针(例如，顶部区域的BorderLayout.NORTH )到我们在示例中使用的常量的更简洁的版本。我们的示例使用的常量是首选的，因为它们是标准的，并且使程序能够调整以适应具有不同方向的语言。

我修改了checkPin(...) ATMLogin类的boolean actionPerformed(...) 方法，以返回可见boolean而不是，以便在<>E247>E151>类的方法中，如果此操作返回true，则仅将所需的<>E252E156>设置为，否则将不执行任何操作。

一定要检查代码，看看您可以做些什么来使它为您的终端工作。

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ATMgui extends JFrame implements ActionListener 
{

    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    public static final int WIDTH = 500;
    public static final int HEIGHT = 200;
    private ATMbizlogic theBLU;// short for the Business Logic Unit
    private JPanel txPanel;
    public JLabel totalBalanceLabel;
    public JTextField withdrawTextField;
    public JTextField depositTextField;
    public JTextField pinTextField;

    /**
     * Creates a new instance of ATMgui
     */
    public ATMgui() 
    {
        setTitle("ATM Transactions");
        setSize(WIDTH, HEIGHT);
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        Container contentPane = getContentPane();
        contentPane.setBackground(Color.BLACK);
        contentPane.setLayout(new BorderLayout());


        // Do the panel for the rest stop
        JLabel start = new JLabel("Welcome To Your Account", JLabel.CENTER);
        Font curFont = start.getFont();
        start.setFont(new Font(curFont.getFontName(), curFont.getStyle(), 25));
        start.setForeground(Color.BLUE);
        start.setOpaque(true);
        start.setBackground(Color.BLACK);


        pinTextField = new JTextField();
        JLabel pinLabel = new JLabel("Enter your PIN below:", JLabel.CENTER);
        pinLabel.setForeground(Color.RED);
        pinLabel.setOpaque(true);
        pinLabel.setBackground(Color.WHITE);



        JButton pinButton = new JButton("Enter Pin OK");
        pinButton.addActionListener(this);
        pinButton.setBackground(Color.red);

        JPanel pinPanel = new JPanel();
        pinPanel.setLayout(new GridLayout(3, 1, 100, 0));

        pinPanel.add(pinLabel);
        pinPanel.add(pinTextField);
        pinPanel.add(pinButton);

        contentPane.add(pinPanel, BorderLayout.WEST);


        JPanel headingPanel = new JPanel();
        headingPanel.setLayout(new GridLayout());
        headingPanel.add(start);

        contentPane.add(headingPanel, BorderLayout.NORTH);


        // Do the panel for the amount & type of transactions
        withdrawTextField = new JTextField();
        JLabel withdrawLabel = new JLabel("Withdraw (0.00)", JLabel.CENTER);
        withdrawLabel.setForeground(Color.RED);
        withdrawLabel.setOpaque(true);
        withdrawLabel.setBackground(Color.WHITE);



        depositTextField = new JTextField();
        JLabel depositLabel = new JLabel("Deposit (0.00)", JLabel.CENTER);
        depositLabel.setForeground(Color.RED);
        depositLabel.setOpaque(true);
        depositLabel.setBackground(Color.WHITE);



        JButton txButton = new JButton("Transactions OK");
        txButton.addActionListener(this);
        txButton.setBackground(Color.red);




        txPanel = new JPanel();
        txPanel.setLayout(new GridLayout(5, 1, 30, 0));

        txPanel.add(withdrawLabel);
        txPanel.add(withdrawTextField);
        txPanel.add(depositLabel);
        txPanel.add(depositTextField);
        txPanel.add(txButton);

        contentPane.add(txPanel, BorderLayout.EAST);
        txPanel.setVisible(false);


        totalBalanceLabel = new JLabel("Your balance after transactions: ", JLabel.CENTER);
        totalBalanceLabel.setForeground(Color.BLUE);
        totalBalanceLabel.setOpaque(true);
        totalBalanceLabel.setBackground(Color.BLACK);


        contentPane.add(totalBalanceLabel, BorderLayout.SOUTH);


        theBLU = new ATMbizlogic();
    }

    public void actionPerformed(ActionEvent e) 
    {
        String actionCommand = e.getActionCommand();

        // Container contentPane = getContentPane();

        if (actionCommand.equals("Transactions OK")) 
        {
            try 
            {
                double deposit = Double.parseDouble(depositTextField.getText().trim());
                double withdraw = Double.parseDouble(withdrawTextField.getText().trim());
                theBLU.computeBalance(withdraw, deposit);
                totalBalanceLabel.setText("Your balance after transactions: " + theBLU.getBalance());

            } 
            /*catch (ATMexception ex) 
            {
                totalBalanceLabel.setText("Error: " + ex.getMessage());
            }*/ 
            catch (Exception ex) 
            {
                totalBalanceLabel.setText("Error in deposit or withdraw amount: " + ex.getMessage());
            }
        } 
        else if (actionCommand.equals("Enter Pin OK")) 
        {

            try 
            {               
                double pin = Double.parseDouble(pinTextField.getText().trim());
                if(theBLU.checkPin(pin))
                    txPanel.setVisible(true);
                totalBalanceLabel.setText("Your balance after transactions: " + theBLU.getBalance());               
            } 
            /*catch (ATMexception ex) 
            {
                totalBalanceLabel.setText("Error: " + ex.getMessage());
            }*/ 
            catch (Exception ex) 
            {
                totalBalanceLabel.setText("Error in pin: " + ex.getMessage());
                ex.printStackTrace();
            }
        } 
        else 
        {
            System.out.println("Error in button interface.");
        }
    }

    public static void main(String[] args) 
    {
        ATMgui gui = new ATMgui();
        gui.setVisible(true);
    }
}

class ATMbizlogic 
{

    private double totalBalance;
    private boolean rightPinEntered;

    /**
     * Creates a new instance of ATMbizlogic
     */
    public ATMbizlogic() 
    {
        totalBalance = 0.0;
        rightPinEntered =  true;
    }

    public void computeBalance(double withdraw, double deposit)
    //throws ATMexception 
    {
        if(withdraw <=0)
        {
            System.out.println("Negative withdraw not allowed");
            //throw new ATMexception("Negative withdraw not allowed");
        }   

        if(deposit <=0)
        {
            System.out.println("Negative deposit not allowed");
            //throw new ATMexception("Negative deposit not allowed");
        }   

         double balance = deposit - withdraw;

        totalBalance = totalBalance + balance;
    }

    public boolean checkPin(double pin)
    //throws ATMexception 
    {
        if(pin <=0)
        {
            System.out.println("Negative pin not allowed");
            rightPinEntered = false;
            //throw new ATMexception("Negative pin not allowed");
        }   
        /*else if(rightPinEntered == false)
        {
            System.out.println("Can not take another pin");
            rightPinEntered = false;
            //throw new ATMexception("Can not take another pin");
        }*/ 
        else if(pin<1111 || pin>9999)
        {
            System.out.println("Enter a valid pin");
            rightPinEntered = false;
            //throw new ATMexception("Enter a valid pin");
        }
        else
        {       
            rightPinEntered = true;
        }

        return rightPinEntered;
    }

    public double getBalance()
    {
        return totalBalance;
    }
}

票数 1

Stack Overflow用户

发布于 2012-03-13 17:03:56

我不认为这是为按钮实现ActionListeners的正确方式。

public void actionPerformed(ActionEvent e) 
    {   
       String actionCommand = e.getActionCommand();

      // Container contentPane = getContentPane();
        if (actionCommand.equals("Transactions OK"))
        else ...
    }

使用方法actionPerformed中的if-else语句，每次按下任何按钮时，您的程序都必须检查要调用的侦听器，这样，代码就不容易编辑和重用。此外，GUI容器的作用类似于事件的接收器，因此您应该避免

pinButton.addActionListener(this);

尝试为每个按钮实现自己的内部类，如下所示：

JButton pinButton = new JButton("Enter Pin OK");
        pinButton.addActionListener(new ActionListener()
            {
                public void actionPerformed(ActionEvent ae){
                    //enter here your action
                                     txPanel.setVisible(true);
                }
            });

通过这种方式，您不需要为您的类实现ActionListener接口，因为您正在为您的pinButton实现接口的内部实例。检查SO的this old question。此外，您应该避免在类构造函数中实现所有的图形用户界面元素，最好是在单独的方法中实现图形用户界面，如createAndShowGui()，并在构造函数中调用它，以遵守Java Swing conventions并在不同于应用程序主线程的不同线程(称为Event Dispatch Thread )中运行Swing组件。阅读this question。

然后在createAndShowGui()方法中包含txPanel.setVisible(false);。

请记住，Swing组件不是线程安全的。

票数 2

Stack Overflow用户

发布于 2012-03-13 16:22:02

在对构造函数ATMgui()的调用中，将

txPanel.setVisible(false);

在actionCommand.equals("Enter Pin OK")部分，您可以将其设置为true。

这是你想要的吗？

票数 1

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/9680017

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EN