ex9_2.java

Java与面向对象程序设计实验教学讲义.复数类的实现,复数类的复杂运算,身份证号码的分析,图形界面设计

//Ex9_2.java
import java.awt.*;
import javax.swing.*;

public class Ex9_2 extends JFrame {
    public Ex9_2()   //构造方法，创建窗口
   {
    
      super( "演示字体、颜色、绘图" );     //调用基类构造方法，设置窗口标题 
      setSize( 480, 250 );                 //设置窗口大小
      setVisible( true );                  //显示窗口
   }

   public void paint( Graphics g )        //
   {
       super.paint( g );  // call superclass's paint method

      g.setFont( new Font( "SansSerif", Font.BOLD, 12 ) ); //设置字体
      g.setColor(Color.blue);                             //设置颜色
      g.drawString("字体ScanSerif，粗体，12号，蓝色",20,50);     //绘制字符串
      
      g.setFont( new Font( "Serif", Font.ITALIC, 14 ) );
      g.setColor(new Color(255,0,0));
      g.drawString( " 字体Serif，斜体，14号，红色", 250, 50 );
      
      g.drawLine(20,60,460,60);                      //绘制直线
      
      g.setColor(Color.green);
      g.drawRect(20,70,100,50);                     //绘制空心矩形
      g.fillRect(130,70,100,50);                    //绘制实心矩形
      
      g.setColor(Color.yellow);
      g.drawRoundRect(240,70,100,50,50,50);          //绘制空心圆角矩形
      g.fillRoundRect(350,70,100,50,50,50);          //绘制实心圆角矩形
      
      g.setColor(Color.cyan);
      g.draw3DRect(20,130,100,50,true);              //绘制有三维突起效果的空心矩形
      g.fill3DRect(130,130,100,50,false);            //绘制有三维凹陷效果的实心矩形
      
      g.setColor(Color.pink);
      g.drawOval(240,130,100,50);                    //绘制空心椭圆
      g.fillOval(350,130,100,50);                    //绘制实心椭圆
      g.setColor(new Color(0,120,20));
      g.drawArc(20,190,100,50,0,90);                 //绘制一段圆弧 
      g.fillArc(130,190,100,50,0,90);       //绘制扇形，扇形由圆弧及两半径圈定
      
      g.setColor(Color.black);
      int xValues[]={250,280,290,300,330,310,320,290,260,270};
      int yValues[]={210,210,190,210,210,220,230,220,230,220};
      g.drawPolygon(xValues,yValues,10);             //绘制空心多边形
      
      int xValues2[]={360,390,400,410,440,420,430,400,370,380};
      g.fillPolygon(xValues2,yValues,10);            //绘制实心多边形
   } // end method paint

   public static void main( String args[] )
   {      
      JFrame.setDefaultLookAndFeelDecorated(true);  //设置窗口的外观感觉为Java默认
      Ex9_2 application = new Ex9_2();            //创建Ex9_2类的一个实例
      application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
   }
}