custombean.java

java模式设计

//简单属性的JAVABEAN
import java.awt.*;
import java.io.Serializable;
import java.beans.*;

public class CustomBean extends Canvas implements Serializable {
	//定义简单的属性color
	private Color color = Color.red;
    //定义构造函数
	public CustomBean() {
	  setSize(100,100);
	  setBackground(color);
  	}
	
    public Color getColor() {
	  return color;
	}

	public void setColor(Color c) {
	  color = c;
	  repaint();
	}

	//显示属性改变的效果，颜色将用文字在背景上写出来
    public void paint(Graphics g) {
	  setBackground(color);
	  String tempColor = "red";
	  if (color == Color.red)
	  {
	     tempColor = "red";
	  } else if (color == Color.green)
	  {
		 tempColor = "green";
	  }	
	  Font f1 = new Font("Monospaced",Font.BOLD,40);
	  g.setFont(f1);
	  g.drawString("I am " + tempColor + "!",50,50);
	}
}