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public abstract void drawString(String str, int x, int y): is used to draw the specified string.
public void drawRect(int x, int y, int width, int height): draws a rectangle with the specified width and height.
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.
public abstract void drawOval(int x, int y, int width, int height): is used to draw oval with the specified width and height.
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.
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).
public abstract boolean drawImage(Image img, int x, int y, ImageObserver observer): is used draw the specified image.
public abstract void drawArc(int x, int y, int width, int height, int startAngle, int arcAngle): is used draw a circular or elliptical arc.
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.
public abstract void setColor(Color c): is used to set the graphics current color to the specified color.
public abstract void setFont(Font font): is used to set the graphics current font to the specified font.

Example of displaying graphics in swing:

     
import java.awt.*;
import javax.swing.JFrame;

public class DisplayGraphics extends Canvas{
	
	public void paint(Graphics g) {
		g.drawString("Hello",40,40);
		setBackground(Color.WHITE);
		g.fillRect(130, 30,100, 80);
		g.drawOval(30,130,50, 60);
		setForeground(Color.RED);
		g.fillOval(130,130,50, 60);
		g.drawArc(30, 200, 40,50,90,60);
		g.fillArc(30, 130, 40,50,180,40);
		
	}
		public static void main(String[] args) {
		DisplayGraphics m=new DisplayGraphics();
		JFrame f=new JFrame();
		f.add(m);
		f.setSize(400,400);
		//f.setLayout(null);
		f.setVisible(true);
	}

}



    

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