Question

大家好日子。我在netbeans的项目中有很多java文件。一个文件名为mainFile，而一些文件名为addSale，addAttendance。在我的mainFile.java中，我创建了一个actionPerformed方法来检查是否单击了一个按钮。但是我想要点击的按钮是在其他java文件上。

我在mainFile.java中添加了这段代码

AddSales addSaleButton;
  Login logButton;

  public void actionPerformed(ActionEvent ae){
    if (ae.getSource() == addSaleButton.getButton()){
      System.out.print("sample add");
    }else if (ae.getSource() == logButton.getButton()){
      System.out.print("sample log");
    }
  } 

  public void setButtonAction(Action action) {
      (addSaleButton.getButton()).setAction(action);
   }

然后我在addSales.java中添加了这个

public JButton getButton() {
        return confirmAddSales;
    }

Answer 1

是的，这是可能的，并且经常完成，但魔鬼在细节中。通常，您将拥有一个Control类，它响应与View类（GUI）完全独立的用户交互。选项包括：

为视图类提供公共addButtonXActionListener(ActionListener l)方法。
给视图属性更改侦听器支持，如果它是Swing组件的子类，它会自动拥有它，然后在JButton的ActionListener中，通常是一个匿名内部类，通知侦听器状态更改。 / LI>
为Ciew类提供一个Control实例变量并进行设置。然后在JButton的ActionListener中，调用适当的控制方法。

修改
例如，这是一个包含3个文件的小程序，1个用于保存JButton的View，1个用于Control，第3个主要类用于运行。

请注意，有两个JButton，它们都使用两种不同的方式通知他们已被按下的外部类。

View类有一个公共方法，Button 1有一个方法public void setButton1Action(Action action)，允许外部类设置button1的Action，然后Control执行此操作，注入一个AbstractAction，通知控件何时button1被压了。

View有一个public void addPropertyChangeListener(PropertyChangeListener l)包装器方法，允许外部类添加到PropertyChangeListener中，然后将其添加到mainPanel对象的属性更改支持中。然后在button2的匿名内部ActionListener类中，要求mainPanel的PropertyChangeSupport通知所有侦听器BUTTON2属性状态的变化。然后，View会添加一个PropertyChangeListener并侦听此属性的状态并进行响应。

import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.beans.PropertyChangeEvent; import java.beans.PropertyChangeListener; import javax.swing.*; public class TestButtonPress { private static void createAndShowGui() { View view = new View(); Control control = new Control(); control.setView(view); JFrame frame = new JFrame("TestButtonPress"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.getContentPane().add(view.getMainPanel()); frame.pack(); frame.setLocationByPlatform(true); frame.setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGui(); } }); } } class View { public static final String BUTTON2 = "Button 2"; private JPanel mainPanel = new JPanel(); private JButton button1 = new JButton(); private JButton button2 = new JButton(BUTTON2); public View() { mainPanel.add(button1); mainPanel.add(button2); button2.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { mainPanel.firePropertyChange(BUTTON2, false, true); } }); } public JComponent getMainPanel() { return mainPanel; } public void setButton1Action(Action action) { button1.setAction(action); } public void addPropertyChangeListener(PropertyChangeListener l) { mainPanel.addPropertyChangeListener(l); } public void removePropertyChangeListener(PropertyChangeListener l) { mainPanel.removePropertyChangeListener(l); } } class Control { View view; public void setView(final View view) { this.view = view; view.setButton1Action(new ButtonAction()); view.addPropertyChangeListener(new Button2Listener()); }; private class ButtonAction extends AbstractAction { public ButtonAction() { super("Button 1"); } @Override public void actionPerformed(ActionEvent evt) { System.out.println(evt.getActionCommand() + " has been pressed!"); } } private class Button2Listener implements PropertyChangeListener { @Override public void propertyChange(PropertyChangeEvent evt) { if (View.BUTTON2.equals(evt.getPropertyName())) { System.out.println("Button 2 has been pressed!"); } } } }

Answer 2

根据我的理解，你想要一个类中的按钮和另一个类中的ActionListener。我不是100％确定这是否是你想要的，但这里有一些代码：

主要班级Btn：

package btn;

public class Btn
{
    public static void main(String[] args)
    {
        Frame f = new Frame();
        f.setVisible(true);
    }

}

按钮类按钮：

package btn;

import javax.swing.JButton;

public class Button extends JButton
{

    public Button()
    {
        super("Hello world");
        this.addActionListener(new ActionListenerClass());
    }
}

ActionListener类ActionListenerClass：

package btn;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class ActionListenerClass implements ActionListener
{
    public static int numberOfClicks = 0;

    @Override
    public void actionPerformed(ActionEvent e)
    {
        numberOfClicks++;
        System.out.println("HELLO WORLD!!\n" + "number of times pressed " + numberOfClicks);
    }

}

帧类框架：

package btn;

import javax.swing.JFrame;

public class Frame extends JFrame
{
    public Frame()
    {
        super("Hello world test");
        this.setBounds(0, 0, 300, 500);
        this.add(new Button());
        this.setDefaultCloseOperation(Frame.EXIT_ON_CLOSE);
    }
}

和输出：

    run:
HELLO WORLD!!
number of times pressed 1
HELLO WORLD!!
number of times pressed 2
HELLO WORLD!!
number of times pressed 3
HELLO WORLD!!
number of times pressed 4
BUILD SUCCESSFUL (total time: 3 seconds)

你在这里做的只是将动作监听器放在一个单独的类中，然后告诉按钮在该类中查找动作监听器

使用以下代码行：this.addActionListener(new ActionListenerClass());

希望这会有所帮助，卢克。

编辑：

尝试使用e.paramString():

这将打印出类似的内容：

HELLO WORLD!!
number of times pressed 1
Button: ACTION_PERFORMED,cmd=Hello world,when=1399588160253,modifiers=Button1
BUILD SUCCESSFUL (total time: 2 seconds)

或e.getActionCommand():

这将打印按钮名称：

run:
HELLO WORLD!!
number of times pressed 1
Button: Hello world
BUILD SUCCESSFUL (total time: 4 seconds)

完整的actionListener代码块：

@Override
    public void actionPerformed(ActionEvent e)
    {
        numberOfClicks++;
        System.out.println("HELLO WORLD!!\n" + "number of times pressed " + numberOfClicks + 
                "\ne.getActionCommand();: " + e.getActionCommand()
        + "\ne.paramString();: " + e.paramString());
    }

输出：

run:
HELLO WORLD!!
number of times pressed 1
e.getActionCommand();: Hello world
e.paramString();: ACTION_PERFORMED,cmd=Hello world,when=1399588455144,modifiers=Button1
BUILD SUCCESSFUL (total time: 6 seconds)

第二次编辑：

确定使用getActionCommand();方法，然后使用开关限制来检查是否按下了按钮。

我添加了另一个按钮，一个名为“LOL”，另一个名为“Hello world”，它们都使用相同的动作监听器。

按下两者的输出：

run:
HELLO WORLD!!
number of times pressed 1
e.getActionCommand();: LOL
e.paramString();: ACTION_PERFORMED,cmd=LOL,when=1399590104631,modifiers=Button1
HELLO WORLD!!
number of times pressed 2
e.getActionCommand();: LOL
e.paramString();: ACTION_PERFORMED,cmd=LOL,when=1399590106679,modifiers=Button1
HELLO WORLD!!
number of times pressed 3
e.getActionCommand();: Hello world
e.paramString();: ACTION_PERFORMED,cmd=Hello world,when=1399590107665,modifiers=Button1
HELLO WORLD!!
number of times pressed 4
e.getActionCommand();: Hello world
e.paramString();: ACTION_PERFORMED,cmd=Hello world,when=1399590107780,modifiers=Button1
BUILD SUCCESSFUL (total time: 5 seconds)

现在使用开关限制来区分按钮：

@Override
    public void actionPerformed(ActionEvent e)
    {
        numberOfClicks++;
        System.out.println("HELLO WORLD!!\n" + "number of times pressed " + numberOfClicks + 
                "\ne.getActionCommand();: " + e.getActionCommand()
        + "\ne.paramString();: " + e.paramString());

        switch(e.getActionCommand())
        {
            case "LOL":
                System.out.println("Button \"LOL\" was clicked");
                break;
            case "Hello world":
                System.out.println("Button \"Hello world\" was clicked");
                break;
        }
    }

用开关输出：

run:
HELLO WORLD!!
number of times pressed 1
e.getActionCommand();: Hello world
e.paramString();: ACTION_PERFORMED,cmd=Hello world,when=1399590324792,modifiers=Button1
Button "Hello world" was clicked
HELLO WORLD!!
number of times pressed 2
e.getActionCommand();: Hello world
e.paramString();: ACTION_PERFORMED,cmd=Hello world,when=1399590324943,modifiers=Button1
Button "Hello world" was clicked
HELLO WORLD!!
number of times pressed 3
e.getActionCommand();: Hello world
e.paramString();: ACTION_PERFORMED,cmd=Hello world,when=1399590325089,modifiers=Button1
Button "Hello world" was clicked
HELLO WORLD!!
number of times pressed 4
e.getActionCommand();: LOL
e.paramString();: ACTION_PERFORMED,cmd=LOL,when=1399590330897,modifiers=Button1
Button "LOL" was clicked
HELLO WORLD!!
number of times pressed 5
e.getActionCommand();: LOL
e.paramString();: ACTION_PERFORMED,cmd=LOL,when=1399590331048,modifiers=Button1
Button "LOL" was clicked
BUILD SUCCESSFUL (total time: 11 seconds)

我希望这能回答你的问题。

检查是否在另一个java文件中单击了一个jbutton

2 个答案: