ovalbean.java

程序或系统实现的功能：编写一个实心圆组件

package oval;

import java.awt.*;
import java.io.*;
import javax.swing.JPanel;

public class OvalBean extends Canvas{

  private java.awt.Color beancolor=Color.red;//颜色属性
  private String text="OVal";
  public OvalBean() {setFont(new Font("Dialog",Font.PLAIN,12));}
  public void paint(Graphics g)
  {
    int width=size().width;//取 bound长和宽
    int height=size().height;
    g.setColor(beancolor);
    g.fillOval(0,0,width,width);//画一个实心圆
    FontMetrics fm=g.getFontMetrics();
    g.setColor(Color.BLACK);
    g.drawString(text,(width-fm.stringWidth(text))/2,(height+fm.getMaxAscent()- fm.getMaxDecent())/2);
  }
  public java.awt.Color getBeancolor() {
    return beancolor;
  }
  public void setBeancolor(java.awt.Color beancolor) {
    this.beancolor = beancolor;
  }
  public String getText() {
    return text;
  }
  public void setText(String text) {
    this.text = text;
  }
}