Displaying graphics in swing:

java.awt.Graphics class provides many methods for graphics programming.

Commonly used methods of Graphics class:

1.    public abstract void drawString(String str, int x, int y): is used to draw the specified string. 2.    public void drawRect(int x, int y, int width, int height): draws a rectangle with the specified width and height. 3.    public abstract void fillRect(int x, int y, int width, int height): is used to fill rectangle with the default color and specified width and height. 4.    public abstract void drawOval(int x, int y, int width, int height): is used to draw oval with the specified width and height. 5.    public abstract void fillOval(int x, int y, int width, int height): is used to fill oval with the default color and specified width and height. 6.    public abstract void drawLine(int x1, int y1, int x2, int y2): is used to draw line between the points(x1, y1) and (x2, y2). 7.    public abstract boolean drawImage(Image img, int x, int y, ImageObserver observer): is used draw the specified image. 8.    public abstract void drawArc(int x, int y, int width, int height, int startAngle, int arcAngle): is used draw a circular or elliptical arc. 9.    public abstract void fillArc(int x, int y, int width, int height, int startAngle, int arcAngle): is used to fill a circular or elliptical arc. 10. public abstract void setColor(Color c): is used to set the graphics current color to the specified color. 11. public abstract void setFont(Font font): is used to set the graphics current font to the specified font.

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Example of displaying graphics in swing:

1.    import java.awt.*;  

2.    import javax.swing.JFrame;  

3.      

4.    public class DisplayGraphics extends Canvas{  

5.          

6.        public void paint(Graphics g) {  

7.            g.drawString("Hello",40,40);  

8.            setBackground(Color.WHITE);  

9.            g.fillRect(130, 30,100, 80);  

10.         g.drawOval(30,130,50, 60);  

11.         setForeground(Color.RED);  

12.         g.fillOval(130,130,50, 60);  

13.         g.drawArc(30, 200, 40,50,90,60);  

14.         g.fillArc(30, 130, 40,50,180,40);  

15.           

16.     }  

17.         public static void main(String[] args) {  

18.         DisplayGraphics m=new DisplayGraphics();  

19.         JFrame f=new JFrame();  

20.         f.add(m);  

21.         f.setSize(400,400);  

22.         //f.setLayout(null);  

23.         f.setVisible(true);  

24.     }  

25.   

26. }