?? selectitem.java
字號:
import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
public class SelectItem extends JFrame implements ItemListener {
BorderLayout bord = new BorderLayout();
JTextField result = new JTextField(27);
JComboBox pick = new JComboBox();
public SelectItem() {
super("Select Item");
pick.addItemListener(this);
pick.addItem("Navigator");
pick.addItem("Internet Explorer");
pick.addItem("Opera");
pick.setEditable(false);
result.setHorizontalAlignment(SwingConstants.CENTER);
result.setEditable(false);
JPanel pane = new JPanel();
pane.setLayout(bord);
pane.add(result, "South");
pane.add(pick, "Center");
setContentPane(pane);
}
public static void main(String[] arguments) {
JFrame frame = new SelectItem();
ExitWindow exit = new ExitWindow();
frame.addWindowListener(exit);
frame.pack();
frame.setVisible(true);
}
public void itemStateChanged(ItemEvent evt) {
Object source = evt.getSource();
if (source == pick) {
Object newPick = evt.getItem();
result.setText(newPick.toString() + " is the selection.");
}
repaint();
}
}
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