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import?javax.swing.*;

import?java.awt.*;

import?java.awt.event.*;

import?java.util.*;

final?class?RectPaintDemo?extends?JFrame?{

final?static?private?Dimension?SIZE?=?new?Dimension(800,?600);

public?String?getTitle()?{return?"RectPaintDemo";}

public?Dimension?getPreferredSize()?{return?SIZE;}

public?Dimension?getMinimumSize()?{return?SIZE;}

public?Dimension?getMaximumSize()?{return?SIZE;}

public?Dimension?getSize()?{return?SIZE;}

private?Canvas?canvas;

private?Brush?brush;

RectPaintDemo()?throws?HeadlessException?{

init();

attachListeners();

doLay();

setVisible(true);

}

private?void?init()?{

brush?=?new?ShapeBrush();

canvas?=?new?Canvas(brush);

}

private?void?attachListeners()?{

addWindowListener(new?WindowAdapter()?{

public?void?windowClosing(WindowEvent?e)?{

System.exit(1);

}

});

}

private?void?doLay()?{

Container?container?=?getContentPane();

container.add(canvas,?BorderLayout.CENTER);

pack();

}

public?static?void?main(String...?args)?{

System.setProperty("swing.defaultlaf",?"com.sun.java.swing.plaf.windows.WindowsLookAndFeel");

SwingUtilities.invokeLater(RectPaintDemo::new);

}

private?interface?Brush?extends?Observer?{

/**

*?do?paint?action

*?@param?g?the?graphics?context?in?you?application

*/

void?paint(Graphics?g);

/**

*?The?component?that?this?brush?hold

*?@return?component?instance

*/

Component?getOwner();

void?setOwner(Component?owner);

}

private?static?final?class?ShapeBrush?implements?Brush?{

private?Component?owner;

private?Rectangle?contentObj?=?new?Rectangle(20,20,40,30);

public?Component?getOwner()?{

return?owner;

}

public?void?setOwner(Component?owner)?{

this.owner?=?owner;

}

public?void?paint(Graphics?g)?{

Graphics2D?g2?=?(Graphics2D)g.create();

g2.fillRect(0,0,getOwner().getWidth(),getOwner().getHeight());

g2.translate(50,?50);

g2.rotate(Math.PI?/?4);

g2.setColor(Color.YELLOW);

g2.draw(contentObj);

g2.dispose();

}

public?void?update(Observable?o,?Object?arg)?{

if?(owner?!62616964757a686964616fe78988e69d8331333337383964=?null)?owner.repaint();

}

}

/**

*?you?canvas

*/

private?class?Canvas?extends?JComponent?{

private?Brush?brush;

private?Canvas(Brush?brush)?{

super();

this.brush?=?brush;

brush.setOwner(this);

}

protected?void?paintComponent(Graphics?g)?{

super.paintComponent(g);

if?(brush?==?null)?return;

brush.paint(g);

}

}

}

總結

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