可能有几种方法可以实现这一点,但我能想到的最简单的方法是,正如安德鲁已经暗示的那样,将是定义自己的形状

import java.awt.Dimension;

import java.awt.EventQueue;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.RenderingHints;

import java.awt.geom.Path2D;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.UIManager;

import javax.swing.UnsupportedLookAndFeelException;

public class SimpleShape {

public static void main(String[] args) {

new SimpleShape();

}

public SimpleShape() {

EventQueue.invokeLater(new Runnable() {

@Override

public void run() {

try {

UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());

} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {

ex.printStackTrace();

}

JFrame frame = new JFrame("Testing");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.add(new TestPane());

frame.pack();

frame.setLocationRelativeTo(null);

frame.setVisible(true);

}

});

}

public class TestPane extends JPanel {

private RightEnd rightEnd;

public TestPane() {

rightEnd = new RightEnd(100, 100, 40);

}

@Override

public Dimension getPreferredSize() {

return new Dimension(100, 100);

}

@Override

protected void paintComponent(Graphics g) {

super.paintComponent(g);

int x = (getWidth() - 100) / 2;

int y = (getHeight()- 100) / 2;

Graphics2D g2d = (Graphics2D) g.create();

g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

g2d.translate(x, y);

g2d.fill(rightEnd);

g2d.dispose();

}

}

public class RightEnd extends Path2D.Float {

public RightEnd(float width, float height, float radius) {

moveTo(0, 0);

lineTo(width - radius, 0);

curveTo(width, 0, width, 0, width, radius);

lineTo(width, height - radius);

curveTo(width, height, width, height, width - radius, height);

lineTo(0, height);

closePath();

}

}

}