System.exit(0);

}

});

button1=new JButton(new ImageIcon("image/PreviousArrow.gif"));

button2=new JButton(new ImageIcon("image/go.GIF"));

button3=new JButton(new ImageIcon("image/NextArrow.gif"));

button1.addActionListener(this);

button2.addActionListener(this);

button3.addActionListener(this);

toolBar=new JToolBar();

toolBar.add(button1);

toolBar.add(button2);

toolBar.add(button3);

textArea=new JTextArea(6,30);

scrollPane=new JScrollPane(textArea);

panel=new JPanel();

setContentPane(panel);

panel.setLayout(new BorderLayout());

panel.setPreferredSize(new Dimension(300,150));

panel.add(toolBar,BorderLayout.NORTH);

panel.add(scrollPane,BorderLayout.CENTER);

pack();

show();

}

public void actionPerformed(ActionEvent e) {

String s="";

if (e.getSource()==button1)

s="左按钮被单击\n";

else if (e.getSource()==button2)

s="中按钮被单击\n";

else if (e.getSource()==button3)

s="右按钮被单击\n";

textArea.append(s);

}

}

（4）编译LX5_9.java。

（5）运行LX5_9.class，产生的窗口界面如图6.9 所示。