设计模式实验6_命令模式

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1、实验报告课程：设计模式实验学期：2010-2011学年第一学期任课教师：专业：学号：姓名：成绩：实验6命令模式1.题目:使用命令模式实现在用户界面中,用户选择需要绘制的图形(矩形、三角形、圆形),并在用户界面中绘制该图形,并能够实现撤销多步的功能。2.模式设计的UML类图：133.程序源代码：（1）命令接口Command.java:publicinterfaceCommand{publicvoidexecute();publicvoidundo();}publicclassNoCommandimplementsCommand{publicvoidexecute(){}publicvoidun

2、do(){}}（2）绘制图形的各个类：importjava.awt.*;importjava.awt.geom.*;importjavax.swing.*;publicclassDrawSquareextendsJPanel{privatestaticDrawSquarepanel=newDrawSquare();publicstaticDrawSquaregetJPanel(){returnpanel;}publicvoidpaintComponent(Graphicsg){Graphics2Dg2=(Graphics2D)g;super.paintComponent(g);doubler

3、ectX=130;doublerectY=40;//设置坐标的初始值doublewidth=100;doubleheight=100;Rectangle2Drect=newRectangle2D.Double(rectX,rectY,width,height);g2.draw(rect);}}publicclassDrawRectanqleLongextendsJPanel{privatestaticDrawRectanqleLongpanel=newDrawRectanqleLong();publicstaticDrawRectanqleLonggetJPanel(){returnpane

4、l;}publicvoidpaintComponent(Graphicsg){Graphics2Dg2=(Graphics2D)g;super.paintComponent(g);doublerectX=110;doublerectY=40;//设置坐标的初始值doublewidth=150;doubleheight=100;Rectangle2Drect=newRectangle2D.Double(rectX,rectY,width,height);g2.draw(rect);}}13publicclassDrawRectanqleHeightextendsJPanel{privatest

5、aticDrawRectanqleHeightpanel=newDrawRectanqleHeight();publicstaticDrawRectanqleHeightgetJPanel(){returnpanel;}publicvoidpaintComponent(Graphicsg){Graphics2Dg2=(Graphics2D)g;super.paintComponent(g);doublerectX=135;doublerectY=30;//设置坐标的初始值doublewidth=85;doubleheight=130;Rectangle2Drect=newRectangle2

6、D.Double(rectX,rectY,width,height);g2.draw(rect);}}publicclassDrawTrianqleextendsJPanel{privatestaticDrawTrianqlepanel=newDrawTrianqle();publicstaticDrawTrianqlegetJPanel(){returnpanel;}publicvoidpaintComponent(Graphicsg){Graphics2Dg2=(Graphics2D)g;super.paintComponent(g);doublepoint1X=180;doublepo

7、int1Y=40;//设置坐标的初始值doublepoint2X=130;doublepoint2Y=120;doublepoint3X=210;doublepoint3Y=150;Line2Dline1=newLine2D.Double(point1X,point1Y,point2X,point2Y);Line2Dline2=newLine2D.Double(point1X,point1Y,point3X,