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How to draw a line using GUI in Java

How to draw a line using GUI?

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);
   }
}

The above code sample will produce the following result.

Line is displayed in a frame.

java_simple_gui.htm

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