***初学者问题，java中绘图问题*****

Question

我想在java窗口中画直线，但都没怎么好用，谁能告诉我这个例子？谢谢！

Answer 1

import java.awt.geom.*;
import java.awt.*;
import javax.swing.*;
public class DrawLine extends JFrame
{
private static  final int DEFAULT_WIDTH=600;
private static final int DEFAULT_HEIGHT=300;
public DrawLine()
{
setTitle("DrawLine");
setSize(DEFAULT_WIDTH,DEFAULT_HEIGHT);
SketChPanel panel =new SketChPanel();
Container contentPane=getContentPane();
contentPane.add(panel);
}
public static void main(String arg[])
{
DrawLine frame=new DrawLine();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.show();
}
}
 class SketChPanel extends JPanel
{
private Point2D last;
private Point2D end;
public SketChPanel()
{
last=new Point2D.Double(100,100);
end=new Point2D.Double(500,100);
}


public void paintComponent(Graphics g)
{
super.paintComponent(g);
Graphics2D g2=(Graphics2D)g;
Line2D line=new Line2D.Double(last,end);
g2.draw(line);
}
}