A line is drawn using two points : Line « 2D Graphics « Java Tutorial

1. Java Tutorial
2. 2D Graphics
3. Line

import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class LinesDashes1 extends JPanel {

  public void paintComponent(Graphics g) {
    super.paintComponent(g);

    Graphics2D g2d = (Graphics2D) g;

    float[] dash1 = { 2f, 0f, 2f };

    g2d.drawLine(20, 40, 250, 40);

    BasicStroke bs1 = new BasicStroke(1, 
        BasicStroke.CAP_BUTT, 
        BasicStroke.JOIN_ROUND, 
        1.0f, 
        dash1,
        2f);
    g2d.setStroke(bs1);
    g2d.drawLine(20, 80, 250, 80);

    }

  public static void main(String[] args) {
    LinesDashes1 lines = new LinesDashes1();
    JFrame frame = new JFrame("Lines");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.add(lines);
    frame.setSize(280, 270);
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);

  }
}

16.12.Line
	16.12.1.	Draw a line
	16.12.2.	draw Line from (10, 15) to (100, 115)
	16.12.3.	Line2D.Float
	16.12.4.	Draw a point: use a drawLine() method
	16.12.5.	A line is drawn using two points
	16.12.6.	Dash style line
	16.12.7.	Line dashes style 2
	16.12.8.	Lines Dashes style 3
	16.12.9.	Line Dash Style 4
	16.12.10.	Draw Dashed
	16.12.11.	Compares two lines are returns true if they are equal or both null.
	16.12.12.	Creates a region surrounding a line segment by 'widening' the line segment.