面向对象程序设计实验报告java实验报告图形用户界面

1、图形用户界面设计实验1NestedPanelsTheprogramNestedPanels.javaisfromListing3.8ofthetext.Savetheprogramtoyourdirectoryanddothefollowing:1.Compileandruntheprogram.Experimentwithresizingtheframeandobservetheeffectonthecomponents.运行程序后出现如下界面：Ig?|NestedPanels改变窗口的大小，观察到：(见下图)(1) 两个子面板one和two的尺寸都保持不变。(2) 蓝色的主面板随着窗口的变

2、大而扩展。(3) 蓝色面板变长，one和tw。子面板都不变，当蓝色面板变宽时，两个子面板随着它移动，并保持居中状态。(4) 缩小窗口，根据流式布局的形式，two子面板因为位置容不下，白动被放在下一行的位置。2.Modifytheprogrambyaddingathirdsubpanelthatistwiceaswide,butthesameheight,astheothertwosubpanels.Chooseyourownlabelandcolorforthesubpanel(thecolorshouldnotbered,green,orblue).Addthepaneltotheprima

3、rypanelaftertheothertwopanels.修改的代码如下：JPanelsubPanel3=newJPanel();subPanel3.setPreferredSize(newDimension(300,100);ubPanel3.setBackground(Color.red);JLabellabel3=newJLabel("Three");subPanel3.add(label3);primary.add(subPanel3);3.Compileandrunthemodifiedprogram.Again,experimentwithresizingth

4、eframeandobservetheeffectonthecomponents.4.Nowaddastatementtotheprogramtosetthepreferredsizeoftheprimarypanelto320by260.(Whatwouldbethepurposeofthis?).Compileandruntheprogramtoseeifanythingchanged.代码修改：primary.setPreferredSize(newDimension(320,260);这一步是运行时让主面板的大小固定为宽度320,高度260。5.Nowaddanotherpanelwi

5、thbackgroundcolorblueandsize320by20.Adda"MyPanels"labeltothispanelandthenaddthispaneltotheprimarypanelbeforeaddingtheotherpanels.Compileandruntheprogram.Whatwastheeffectofthispanel?代码如下：JPanelsubPanel4=newJPanel();subPanel4.setPreferredSize(newDimension(320,20);subPanel4.setBackground(Colo

6、r.blue);JLabellabel4=newJLabel("MyPanel");subPanel4.add(label4);primary.add(subPanel4);primary.add(subPanel1);primary.add(subPanel2);primary.add(subPanel3);因为蓝色主面板的宽320,由于流式布局，一个一个把面板加到主面板，MyPanel已经占据了320,所以one面板只能去到下一行。同理得Two,Three的布局形式。6、用可重用的思想编写该界面:packagelab3;importjava.awt.Color;impo

7、rtjava.awt.Dimension;importjavax.swing.JFrame;importjavax.swing.JLabel;importjavax.swing.JPanel;publicclassNestedPanels1extendsJFrame/Presentstwocoloredpanelsnestedwithinathird./JPanelsubPanel1,subPanel2,subPanel3,subPanel4,primary;JLabellabel1,label2,label3,label4;publicNestedPanels1()label1=newJLa

8、bel("One");label2=newJLabel("Two");label3=newJLabel("Three");label4=newJLabel("MyPanel");subPanel1=newJPanel();subPanel2=newJPanel();subPanel3=newJPanel();subPanel4=newJPanel();primary=newJPanel();subPanel1.setPreferredSize(newDimension(150,100);subPanel2.setP

9、referredSize(newDimension(150,100);subPanel3.setPreferredSize(newDimension(300,100);subPanel4.setPreferredSize(newDimension(320,20);primary.setPreferredSize(newDimension(320,260);subPanel1.setBackground(Color.green);subPanel2.setBackground(Color.red);subPanel3.setBackground(Color.red);subPanel4.setB

10、ackground(Color.blue);primary.setBackground(Color.blue);subPanell.add(labell);subPanel2.add(label2);subPanel3.add(label3);subPanel4.add(label4);primary.add(subPanel4);primary.add(subPanell);primary.add(subPanel2);primary.add(subPanel3);getContentPane().add(primary);pack();setVisible(true);setDefault

11、CloseOperation(JFrame.EXIT_ON_CLOSE);publicstaticvoidmain(String口args)NestedPanels1NP=newNestedPanels1();NP.setTitle("NestedPanels");/设置窗口的名称实验2VotingwithButtonsFilesVoteCounter.javaandVoteCounterPanel.javacontainslightlymodifiedversionsofPushCounter.javaandPushCounterPanel.javainlistings4

12、.10and4.11ofthetext.Asinthetexttheprogramcountsthenumberoftimesthebuttonispushed;however,itassumes(pretends”)eachpushisavoteforJoesothebuttonandvariableshavebeenrenamedappropriately.1. Compiletheprogram,thenrunittoseehowitworks.每次点击按钮一次，会显示Joe的得票数:I务VoteCounterVoteforJoeVotesforJoe:42. Modifytheprog

13、ramsothattherearetwocandidatestovoteforJoeandSam.Todothisyouneedtodothefollowing:a. AddvariablesforSanavotecounter,abutton,andalabel.b. AddanewinnerclassnamedSamButtonListenertolistenforclicksonthebuttonforSam.InstantiateaninstanceoftheclasswhenaddingtheActionListenertothebuttonforSam.c. Addthebutto

14、nandlabelforSamtothepanel.代码如下：*/VoteCounterPanel.java/Demonstratesagraphicaluserinterfaceandeventlistenersto/tallyvotesfortwocandidates,JoeandSam./*packagelab4;importjava.awt.*;importjava.awt.event.*;importjavax.swing.*;publicclassVoteCounterPanelextendsJPanel(privateintvotesForJoe,votesForSam;priv

15、ateJButtonjoe,Sam;privateJLabellabelJoe,labelSam;publicVoteCounterPanel()(votesForJoe=0;votesForSam=0;joe=newJButton("VoteforJoe");Sam=newJButton("VoteforSam");joe.addActionListener(newJoeButtonListener();Sam.addActionListener(newSamButtonListener();labelJoe=newJLabel("Votes

16、forJoe:"+votesForJoe);labelSam=newJLabel("VotesforSam:"+votesForSam);add(joe);add(labelJoe);add(Sam);add(labelSam);setPreferredSize(newDimension(300,80);setBackground(Color.cyan);privateclassJoeButtonListenerimplementsActionListenerpublicvoidactionPerformed(ActionEventevent)votesForJo

17、e+;labelJoe.setText("VotesforJoe:"+votesForJoe);privateclassSamButtonListenerimplementsActionListenerpublicvoidactionPerformed(ActionEventevent)votesForSam+;labelSam.setText("VotesforSam:"+votesForSam);3、Compileandruntheprogram.点击按钮后:4、以重用的思想实现该界面的代码如下:packagelab4;importjava.awt.

18、Color;importjava.awt.Dimension;importjava.awt.event.*;importjavax.swing.*;implementspublicclassVoteCounter1extendsJFrameActionListenerprivateJPanelVoteCounterPanel;privateintvotesForJoe,votesForSam;privateJButtonjoe,Sam;privateJLabellabelJoe,labelSam;publicVoteCounter1()votesForJoe=0;votesForSam=0;V

19、oteCounterPanel=newJPanel();joe=newJButton("VoteforJoe");Sam=newJButton("VoteforSam");joe.addActionListener(this);Sam.addActionListener(this);labelJoe=newJLabel("VotesforJoe:"+votesForJoe);labelSam=newJLabel("VotesforSam:"+votesForSam);VoteCounterPanel.add(joe

20、);VoteCounterPanel.add(labelJoe);VoteCounterPanel.add(Sam);VoteCounterPanel.add(labelSam);VoteCounterPanel.setPreferredSize(newDimension(300,80);VoteCounterPanel.setBackground(Color.cyan);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);getContentPane().add(VoteCounterPanel);pack();setVisible(true);pu

21、blicvoidactionPerformed(ActionEventevent)/确定事件源if(event.getSource()=joe)(votesForJoe+;labelJoe.setText("VotesforJoe:"+votesForJoe);if(event.getSource()=Sam)votesForSam+;labelSam.setText("VotesforSam:"+votesForSam);publicstaticvoidmain(Stringargs)VoteCounter1VC1=newVoteCounter1();

22、VC1.setTitle("VoteCounter");/设置窗口的名称实验3CalculatingBodyMassIndexBodyMassIndex(BMI)ismeasureofweightthattakesheightintoaccount.Generally,aBMIabove25isconsideredhigh,thatis,likelytoindicatethatanindividualisoverweight.BMIiscalculatedasfollowsforbothmenandwomen:(703*heightininches)/(weightinpo

23、unds)2FilesBMI.javaandBMIPanel.javacontainskeletonsforaprogramthatusesaGUItolettheusercomputetheirBMI.ThisissimilartotheFahrenheitprograminlistings4.12and4.13ofthetext.Fillinthecodeasindicatedbythecommentsandcompileandrunthisprogram;youshouldseetheBMIcalculatordisplayed.填写的代码如下：packagelab4;*/BMIPane

24、l.java/ComputesbodymassindexinaGUI./*importjava.awt.*;importjava.awt.event.*;importjavax.swing.*;publicclassBMIPanelextendsJPanel(privateintWIDTH=280;privateintHEIGHT=120;privateJLabelheightLabel,weightLabel,BMILabel,resultLabel;privateJTextFieldheight,weight;privateJButtoncalculate;/SetsuptheGUI./p

25、ublicBMIPanel()(/createlabelsfortheheightandweighttextfieldsheightLabel=newJLabel("Yourheightininches:");weightLabel=newJLabel("Yourweightinpounds:");/createa"thisisyourBMI"labelBMILabel=newJLabel("thisisyourBMI");/createaresultlabeltoholdtheBMIvalueresultLabe

26、l=newJLabel();/createaJTextFieldtoholdtheperson'sheightininches/createaJTextFieldtoholdtheperson'sweightinpoundshweight=newJTextField(5);/createabuttontopresstocalculateBMIca/createaBMIListenerandmakeitlistenforthebuttontobepressedBMIlistenerBl=newBMIIistener();calculate.addActionListener(BL

27、);/addtheheightlabelandheighttextfieldtothepaneladd(heightLabel);add(height);/addtheweightlabelandweighttextfieldtothepaneladd(weightLabel);add(weight);/addthebuttontothepaneladd(calculate);/addtheBMIlabeltothepaneladd(calculate);/addthelabelthatholdstheresulttothepaneladd(resultLabel);/setthesizeof

28、thepaneltotheWIDTHandHEIGHTconstantssetPreferredSize(newDimension(WIDTH,HEIGHT);/setthecolorofthepaneltowhateveryouchoosetcyan);*/Representsanactionlistenerforthecalculatebutton.*privateclassBMIListenerimplementsActionListener(/ComputetheBMIwhenthebuttonispressed/publicvoidactionPerformed(ActionEven

29、tevent)(StringheightText,weightText;intheightVal,weightVal;doublebmi;/getthetextfromtheheightandweighttextfieldsheightText=height.getText();weightText=weight.getText();/UseInteger.parseInttoconvertthetexttointegervaluesheightVal=Integer.parseInt(heightText);weightVal=Integer.parseInt(weightText);/Ca

30、lculatethebmi=703*weightinpounds/(heightininches)A2bmi=(703*weightVal)/(heightVal*heightVal);/Putresultinresultlabel.UseDouble.toStringtoconvertdoubletostring.resultLabel.setText("YourBMIis:"+Double.toString(bmi);运行时:色BMIYourheightininches:Yourweightinpounds:Calculate输入数字后:Yourweightinpoun

31、ds:4uCaJculareYourBMIis;13.0用可重用的思想编写该界面：packagelab4;*/BMIPanel.java/ComputesbodymassindexinaGUI.*importjava.awt.*;importjava.awt.event.*;importjavax.swing.*;publicclassBMI1extendsJFrameimplementsActionListenerprivateintWIDTH=280;privateintHEIGHT=120;privateJPanelBMIPanel;privateJLabelheightLabel,we

32、ightLabel,BMILabel,resultLabel;privateJTextFieldheight,weight;privateJButtoncalculate;/SetsuptheGUI./publicBMI1()BMIPanel=newJPanel();heightLabel=newJLabel("Yourheightininches:");weightLabel=newJLabel("Yourweightinpounds:");/createa"thisisyourBMI"labelBMILabel=newJLabel

33、("thisisyourBMI");/createaresultlabeltoholdtheBMIvalueresultLabel=newJLabel();/createaJTextFieldtoholdtheperson'sheightininches/createaJTextFieldtoholdtheperson'sweightinpoundsheweight=newJTextField(5);/createabuttontopresstocalculateBMIcacalculate.addActionListener(this);/addtheheightlabelandheighttextfieldtothepanelB_MIPanel.add(heightLabel);B_MIPanel.add(height);/addtheweightlabelandweighttextfieldtothepanelBMI