一个滚动条的代码,设置了长度是1到90,为什么运行出来实际长度是1到80?import java.awt.*;
import java.awt.event.*;import javax.swing.*;public class WellAdjusted extends JFrame implements AdjustmentListener {
JTextField value = new JTextField("50", 30);
JScrollBar bar = new JScrollBar(SwingConstants.HORIZONTAL,
50, 10, 1, 90); public WellAdjusted() {
super("Well Adjusted");
setSize(600, 200);
bar.addAdjustmentListener(this);
value.setHorizontalAlignment(SwingConstants.CENTER);
value.setEditable(false);
JPanel pane = new JPanel();
pane.setLayout(new BorderLayout());
pane.add(value, "Center");
pane.add(bar, "South");
setContentPane(pane);
} public static void main(String[] arguments) {
JFrame frame = new WellAdjusted(); ExitWindow exit = new ExitWindow();
frame.addWindowListener(exit); frame.setVisible(true);
} public void adjustmentValueChanged(AdjustmentEvent evt) {
Object source = evt.getSource();
if (source == bar) {
int newValue = bar.getValue();
value.setText("" + newValue);
}
repaint();
}
}
class ExitWindow extends WindowAdapter {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
}
import java.awt.event.*;import javax.swing.*;public class WellAdjusted extends JFrame implements AdjustmentListener {
JTextField value = new JTextField("50", 30);
JScrollBar bar = new JScrollBar(SwingConstants.HORIZONTAL,
50, 10, 1, 90); public WellAdjusted() {
super("Well Adjusted");
setSize(600, 200);
bar.addAdjustmentListener(this);
value.setHorizontalAlignment(SwingConstants.CENTER);
value.setEditable(false);
JPanel pane = new JPanel();
pane.setLayout(new BorderLayout());
pane.add(value, "Center");
pane.add(bar, "South");
setContentPane(pane);
} public static void main(String[] arguments) {
JFrame frame = new WellAdjusted(); ExitWindow exit = new ExitWindow();
frame.addWindowListener(exit); frame.setVisible(true);
} public void adjustmentValueChanged(AdjustmentEvent evt) {
Object source = evt.getSource();
if (source == bar) {
int newValue = bar.getValue();
value.setText("" + newValue);
}
repaint();
}
}
class ExitWindow extends WindowAdapter {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
}
解决方案 »
免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货