Scroll

File: java/Scroll/Main.java

/*
 * Like simple button, but showing Silder
 * R. Jacob  9/18/2001
 */

import java.awt.Frame;
import java.awt.Container;
import java.awt.FlowLayout;

import java.awt.event.ActionListener;
import java.awt.event.AdjustmentListener;

import javax.swing.JFrame;

public class Main extends JFrame {
    public static void main (String [] args) {
	new Main ();
    }
    
    public Main () {
	// Window setup
	setSize (300, 300);
	Container content = getContentPane();
	content.setLayout (new FlowLayout());

	// Put a scrollbar in it, don't bother remembering
	content.add (new MyScrollBar (1));

	// Put another scrollbar
	content.add (new MyScrollBar (2));

	// And a button, for good measure
	content.add (new MyButton ("Push me"));

	// Show the window
	setVisible (true);
    }
}

File: java/Scroll/MyScrollBar.java

import java.awt.event.AdjustmentListener;
import java.awt.event.AdjustmentEvent;

import javax.swing.JScrollBar;

public class MyScrollBar extends JScrollBar implements AdjustmentListener {
    // My private ID number, so I can tell my scrollbar's apart
    private int id;

    public MyScrollBar (int id) {
	// Customize properties of our ScrollBar
	// Named static constant
	setOrientation (HORIZONTAL);
	setMinimum (0);
	setMaximum (100);
	// Initial value
	setValue (25);

	this.id = id;
	addAdjustmentListener (this);
    }

    public void adjustmentValueChanged (AdjustmentEvent event) {
	System.out.println ("Scrollbar " + id + ": new value = " + getValue());
    }
}

File: java/Scroll/MyButton.java

import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

import javax.swing.JButton;

/*
 * Same as before
 */
public class MyButton extends JButton implements ActionListener {
    public MyButton (String label) {
	setText (label);
	addActionListener (this);
    }

    public void actionPerformed(ActionEvent e) {
	System.out.println ("Button was pushed");
    }
}