javabeandemo3.java

java程序设计语言源代码

//Example 3 of Chapter 13

package JavaBeanDemo;

import java.awt.*;
import java.io.Serializable;

public class JavaBeanDemo3 extends Canvas implements Serializable
{
	private Color beanColor=Color.blue;
	private String label;
	
	public JavaBeanDemo3()
	{
		resize(60,40);
		this.label = "Bean";
		setFont(new Font( "Dialog", Font.PLAIN,12 ) );
	}
	
	public void paint(Graphics g)
	{
		g.setColor(beanColor);
		g.fillRect(20,5,20,30);
		g.fillArc(5,5,30,30,0,360);
		g.fillArc(25,5,30,30,0,360);
		g.setColor(Color.orange);
		
		int width=size().width;
		int height=size().height;
		FontMetrics fm=g.getFontMetrics();
		g.drawString(label,(width-fm.stringWidth(label))/2,
			(height+fm.getMaxAscent()-fm.getMaxDescent())/2);
	}
	
	public Color getColor()
	{
		return beanColor;
	}
	
	public void setColor(Color newColor)
	{
		beanColor=newColor;
		repaint();
	}
	
	public String getLabel()
	{
		return label;
	}
	
	public void setLabel(String newlabel)
	{
		label=newlabel;
		repaint();
	}
}