9. 实现下面的图形化界面,完成以下功能:
1. 点击”open file” 按钮,打开文件对话框,选择文件,在文本框中输出所选文件的路径:
2. 点击”save file” 按钮,打开文件对话框,在对话框中输入文件名,并在文件框中输出保存文件的路径.
请在划线处编写适当的语句,使程序能正确执行.
Import javax.swing.JfileChooser;
Import javax.swing.JTextArea;
Import javax.swing.JButton;
Import javax.swing.JFram;
Import javax.swing.JPanel;
Import Java.awt.event.*;
Import java.io.*;
Import java.awt.*;
Public class swingExamples implements ActionListener
{
Private Jframe frame;
Private Jbutton button;
Private Jbutton saveButton;
Private Jtextrea textArea;
Private JfileChoose dia;
Private Jpanel buttonPanel;
Public void initGui()
{
Frame=new JFrame(“file chooser”);
Button=new Jbutton(“open file”);
Button.setActionCommand(“open”);
Button.addActionListener(this);
saveButton=new Jbutton(“save file”);
_____________________________;
saveButton.addActionListener(this);
textArea=new JtextArea(“”,10.,10);
buttonPanel=new Jpanel();
dia=new JfileChooser();
frame.addwindowListener(new windowAdapter()
{
Public void windowClosing (WindowEvent e)
{
System.exit(0);
}
});
ButtonPanel.add(button);
ButtonPanel.add(saveButton);
Frame.getContentPane().add(buttonPanel,BorderLayout.NORTH);
Frame.getContentPane().add(textArea,BorderLayout.CENTER);
Frame.setSize(200,200);
Frame.setVisible(true);
}
Public void actionPerformed(ActionEvent event)
{
If(event.getActionCommand().equals(“open”))
{
Dia.showOpenDialog(frame);
Dia.setVisible(true);
File file=dia.getSelectedFilePath();
textArea.append(“path of selected file:”+fileName+”\r\n”);
}
Else if(event.getActionCommand().equals(“save”))
{
Dia.showSaveDialog(frame);
Dia.setVisible(true);
File file=dia.getSelectedFile();
String fileName=file.getAbsolutePath();
textArea.append(“path of saved file:”+fileName+”\r\n”);
}
}
Public static void main(string arqs[])
{
SwingExample3 example=new SwingExample3();
Example.initGUI();
}
}
答案:saveButton.setActionCommand(“save”)
10. 实现下图中的界面,完成功能;点击鼠标时,在文本框中输出鼠标点击的位置,点击次数和点击的键(左键或右键).请在划线处编写适当的语句,使程序能够正确执行.
Import java.awt.*;
Import java.awt.event.*;
Public class AWTExample6 extends MouseaAdapter
{
Private Frame frame;
Private TextArea textArea;
Private MenuItem about;
Private MenuItem exit;
Private MenuItem popupMenu;
Private Panel panel;
Public void initGUI()
{
Frame=new Frame(“mouse event”);
textArea=new TextArea(“”,10,10);
_______________________________
Frame.add(textArea);
Frame.setSize(200,200);
Frame.setVisible(true);
Frame.addWindowListener(new WindowAdapter()
{
Public void windowClosing(windowEvent e)
{System.exit(0);
}
});
}
Public void mousePressed(MouseEvent event)
{
If(event.getModifiers()==event.BUTTON1_MASK)
{textArea.append(“点击坐键”+”\r\n”);
textArea.append(“点击位置:x=”+event.getX()+”y=”+event.getY()+”\r\n”);
textArea.append(“点击次数”+event.getClickCout()+”\r\n”);
}
Else if (event.getModifiers()==event.BUTTON3_MASK)
{
textArea.append(“点击右键"+”\r\n”);
textArea.append(“点击位置：x=”+event.getX()+”y=”+event.getY()+”\r\n”;
textArea.append(“点击次数”+event.getClickCout()+”\r\n”);
}
}
Public static void main(string args[])
{
AWTEXAMple6 example-new AWTExample6();
Example.initGUI();
}
}
答案：textArea.addMouseListener(this);
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