Java by API/java.awt/BasicStroke

BasicStroke.CAP_BUTT

import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MainClass extends JPanel {
  public void paint(Graphics g) {
    Graphics2D g2 = (Graphics2D) g;
    BasicStroke bs = new BasicStroke(16.0f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL);
    g2.setStroke(bs);
    g.drawLine(30, 20, 270, 20);
  }
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.getContentPane().add(new MainClass());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(200, 200);
    frame.setVisible(true);
  }
}

BasicStroke.CAP_ROUND

import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MainClass extends JPanel {
  public void paint(Graphics g) {
    Graphics2D g2 = (Graphics2D) g;
    BasicStroke bs = new BasicStroke(16.0f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_BEVEL);
    g2.setStroke(bs);
    g.drawLine(30, 20, 270, 20);
  }
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.getContentPane().add(new MainClass());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(200, 200);
    frame.setVisible(true);
  }
}

BasicStroke.CAP_SQUARE

import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MainClass extends JPanel {
  public void paint(Graphics g) {
    Graphics2D g2 = (Graphics2D) g;
    BasicStroke bs = new BasicStroke(16.0f, BasicStroke.CAP_SQUARE, BasicStroke.JOIN_BEVEL);
    g2.setStroke(bs);
    g.drawLine(30, 20, 270, 20);
  }
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.getContentPane().add(new MainClass());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(200, 200);
    frame.setVisible(true);
  }
}

BasicStroke.JOIN_BEVEL

import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.GeneralPath;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MainClass extends JPanel {
  public void paint(Graphics g) {
    Graphics2D g2 = (Graphics2D) g;
    RenderingHints rh = g2.getRenderingHints();
    rh.put(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
    g2.setRenderingHints(rh);
    BasicStroke bs = new BasicStroke(36.0f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL);
    g2.setStroke(bs);
    GeneralPath path = new GeneralPath();
    path.moveTo(30.0f, 90.0f);
    path.lineTo(150.0f, 20.0f);
    path.lineTo(270.0f, 90.0f);
    g2.draw(path);
  }
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.getContentPane().add(new MainClass());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(200, 200);
    frame.setVisible(true);
  }
}

BasicStroke.JOIN_MITER

import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.GeneralPath;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MainClass extends JPanel {
  public void paint(Graphics g) {
    Graphics2D g2 = (Graphics2D) g;
    RenderingHints rh = g2.getRenderingHints();
    rh.put(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
    g2.setRenderingHints(rh);
    BasicStroke bs = new BasicStroke(36.0f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER);
    g2.setStroke(bs);
    GeneralPath path = new GeneralPath();
    path.moveTo(30.0f, 90.0f);
    path.lineTo(150.0f, 20.0f);
    path.lineTo(270.0f, 90.0f);
    g2.draw(path);
  }
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.getContentPane().add(new MainClass());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(200, 200);
    frame.setVisible(true);
  }
}

BasicStroke.JOIN_ROUND

import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.GeneralPath;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MainClass extends JPanel {
  public void paint(Graphics g) {
    Graphics2D g2 = (Graphics2D) g;
    RenderingHints rh = g2.getRenderingHints();
    rh.put(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
    g2.setRenderingHints(rh);
    BasicStroke bs = new BasicStroke(36.0f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_ROUND);
    g2.setStroke(bs);
    GeneralPath path = new GeneralPath();
    path.moveTo(30.0f, 90.0f);
    path.lineTo(150.0f, 20.0f);
    path.lineTo(270.0f, 90.0f);
    g2.draw(path);
  }
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.getContentPane().add(new MainClass());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(200, 200);
    frame.setVisible(true);
  }
}

new BasicStroke(float width)

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Ellipse2D;
import javax.swing.JComponent;
import javax.swing.JFrame;
public class MainClass{
  public static void main(String[] args) {
    JFrame jf = new JFrame("Demo");
    Container cp = jf.getContentPane();
    MyCanvas tl = new MyCanvas();
    cp.add(tl);
    jf.setSize(300, 200);
    jf.setVisible(true);
  }
}
class MyCanvas extends JComponent {
  public void paint(Graphics g) {
    Graphics2D g2 = (Graphics2D)g;
    
    g2.setPaint(Color.black);
    g2.setStroke(new BasicStroke(8));
    g2.draw(new Ellipse2D.Double(20,20, 50, 50));
  }
}

new BasicStroke(float width, int cap, int join, float miterlimit, float[] dash, float dash_phase)

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.Rectangle2D;
import javax.swing.JComponent;
import javax.swing.JFrame;
public class MainClass{
  public static void main(String[] args) {
    JFrame jf = new JFrame("Demo");
    Container cp = jf.getContentPane();
    MyCanvas tl = new MyCanvas();
    cp.add(tl);
    jf.setSize(300, 200);
    jf.setVisible(true);
  }
}
class MyCanvas extends JComponent {
  Shape shape;
  public MyCanvas() {
    shape = create();
  }
  protected Shape create() {
    float cm = 72 / 2.54f;
    return new Rectangle2D.Float(cm, cm, 2 * cm, cm);
  }

  public void paint(Graphics g) {
    Graphics2D g2 = (Graphics2D) g;
    Stroke stroke = new BasicStroke(1, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL, 0,
        new float[] { 3, 1 }, 0);
    g2.setStroke(stroke);
    
    g2.setPaint(Color.black);
    g2.draw(shape);
    
  }
}