Source Code : Java Examples - Display line using GUI

How to draw a line using GUI?

Solution:

Following example demonstrates how to draw a line using draw() method of Graphics2D class with Line2D object as an argument.

import java.awt.*;

import java.awt.event.*;

import java.awt.geom.Line2D;

import javax.swing.JApplet;

import javax.swing.JFrame;

public class Main extends JApplet {

   public void init() {

      setBackground(Color.white);

      setForeground(Color.white);

   }

   public void paint(Graphics g) {

      Graphics2D g2 = (Graphics2D) g;

      g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,

      RenderingHints.VALUE_ANTIALIAS_ON);

      g2.setPaint(Color.gray);

      int x = 5;

      int y = 7;

      g2.draw(new Line2D.Double(x, y, 200, 200));

      g2.drawString("Line", x, 250);

   }

   public static void main(String s[]) {

      JFrame f = new JFrame("Line");

      f.addWindowListener(new WindowAdapter() {

         public void windowClosing(WindowEvent e) {

            System.exit(0);

         }

      });

      JApplet applet = new Main();

      f.getContentPane().add("Center", applet);

      applet.init();

      f.pack();

      f.setSize(new Dimension(300, 300));

      f.setVisible(true);

   }

}Result:

The above code sample will produce the following result.

Line is displayed in a frame.