JSlider Example
This JSlider example shows two JSliders, a basic one, and one which shows 'ticks'. The horizontal one to the left does not show ticks. The JSlider enables the user to select from continuous values. Each movement of a slider generates many events.
The calls to addChangeListener() enable the events to be acted upon.
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// JSlider Example
import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;
class JSliderExample {
public static void main(String[] args) {
final JSlider sa = new JSlider();
final JSlider sb = new JSlider(JSlider.VERTICAL, 0, 100, 50);
sa.addChangeListener (new ChangeListener() {
public void stateChanged (ChangeEvent e) {
System.out.println(sa.getValue());
}
});
sb.addChangeListener (new ChangeListener() {
public void stateChanged (ChangeEvent e) {
System.out.println(sb.getValue());
}
});
sb.setPaintTicks(true);
sb.setMajorTickSpacing(25);
sb.setMinorTickSpacing(5);
sb.setPaintLabels(true);
JFrame frame = new JFrame();
Container cp = frame.getContentPane();
cp.setLayout(new FlowLayout());
cp.add(sa);
cp.add(sb);
frame.pack();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
10-11 These are the two constructors. The possible constructors for JSlider are:
JSlider() - creates a horizontal slider with the range 0 to 100 and an initial value of 50. JSlider(BoundedRangeModel model) - creates a horizontal slider using the specified BoundedRangeModel. JSlider(int orientation) - creates a slider in the given orientation with the range 0 to 100 and an initial value of 50. JSlider(int min, int max) - creates a horizontal slider using the specified min and max with an initial value halfway between min and max. JSlider(int min, int max, int value) - creates a horizontal slider using the specified min, max and value. JSlider(int orientation, int min, int max, int value) - as above but with the given orientation.
25-28 Methods to control how ticks are displayed.