DrawPanel类---摘自《Java软件开发》Russel Winder & Graham Roberts
import java.awt.*;
import javax.swing.*;
/**
* A <CODE>JPanel</CODE> with a default size. Subclasses must
* override the <CODE>paint</CODE> method which has signature.
*
* <PRE> public void paint(final Graphics g) </PRE>
*
* @version 1.0 1999.09.04
* @author Graham Roberts
* @author Russel Winder
*/
public class DrawPanel extends JPanel{
/**
* The width of the panel.
*/
private int width = 300;
/**
* The height of the panel
*/
private int height = 300;
/**
* Default constructor, uses the default size.
*/
protected DrawPanel() {
setPreferredSize(new Dimension(width, height));
}
/**
* Constructor for a size determined by the user.
*/
protected DrawPanel(final int w, final int h) {
width = w;
height = h;
setPreferredSize(new Dimension(width, height));
}
/**
* Accessor for the width of the panel.
*/
public int getHeight() {
return height;
}
}
import javax.swing.*;
/**
* A <CODE>JPanel</CODE> with a default size. Subclasses must
* override the <CODE>paint</CODE> method which has signature.
*
* <PRE> public void paint(final Graphics g) </PRE>
*
* @version 1.0 1999.09.04
* @author Graham Roberts
* @author Russel Winder
*/
public class DrawPanel extends JPanel{
/**
* The width of the panel.
*/
private int width = 300;
/**
* The height of the panel
*/
private int height = 300;
/**
* Default constructor, uses the default size.
*/
protected DrawPanel() {
setPreferredSize(new Dimension(width, height));
}
/**
* Constructor for a size determined by the user.
*/
protected DrawPanel(final int w, final int h) {
width = w;
height = h;
setPreferredSize(new Dimension(width, height));
}
/**
* Accessor for the width of the panel.
*/
public int getHeight() {
return height;
}
}