1、任務(wù)9設(shè)計(jì)用戶注冊(cè)介面、學(xué)習(xí)方案2(考試系統(tǒng)獨(dú)立)、學(xué)習(xí)目標(biāo)、JComboBox、JCheckBoxl、JRadioButton組件的生成以及ItemEvent事件的處理?？刂艼List組件的創(chuàng)建和ListSelectionEvent事件的處理。熟悉網(wǎng)格包布局管理器、磁帶盒布局使用和各種布局方法的集成應(yīng)用程序。、9.1作業(yè)說(shuō)明、9.2技術(shù)點(diǎn)、可選組件選擇事件復(fù)雜布局管理器、可選組件組合框(JComboBox類)、可選組件列表框(JList類)、可選組件單選按鈕(JRadioButton類)和可選組件復(fù)選框(可選組件復(fù)選框)3 import javax . swing . *；4 public

2、class itemevent demo extends jframe implements item listener，action listener 5 jradio button opt 1；6 JRadioButton opt27 ButtonGroup btg8 JTextArea ta9 JComboBox comb10 jlabelsex，城市；11 public itemeventdemo(string title)12 super(title)；13 set layout(new flow layout(flow layout . left)；14 sex=new JLabe

3、l(性別3360)；15點(diǎn)=新jlabel(主樓：)；16 opt1=新jradiobutton(男性)；17 opt2=new JRadioButton(女人)；18 btg=new button group()；19 btg . add(op t1)；20 btg . add(opt 2)；21 opt 1 . additemlistener(this)；22 opt 2 . additemlistener(this)；23 ta=new JTextArea (8，35)；24 comb=new JComboBox()；25 comb.addItem(北京)；26 comb.addItem

4、(上海)；27 comb.addItem(南京)；28 comb.addItem(廣州)；29 comb.addItem(成都)；30 comb.addItem(昆明)；31 comb . additem listener(this)；32 comb . addaction listener(this)；33 getContentPane()。add(sex)；34 getContentPane()。add(op t1)；35 getContentPane()。add(opt 2)；36 getcontentpane()。add(城市)；37 getContentPane()。add(comb

5、)；38 getContentPane()。add(ta)；39 settitle(標(biāo)題)；40 setSize(300，250)；41 set visible(true)；42示例ItemeventDemo.java(繼續(xù))，示例ItemeventDemo.java(繼續(xù))，43 public static void main(字符串a(chǎn)rgs) 44nn 45 46 /如果為49 if(e . get source()=op t1)/op t1，則為50 ta.append(n性別：男性)；如果51 El seif(e . get source()=opt 2)/opt 2選擇了52 ta

6、. append(n性別：女人)；53 if(e . get source()=comb)54 str=comb . getselecteditem()。tostring()；55 ta.append(n國(guó)籍： str=ItemEvent事件)；56 57 58 public void action performed(action evente)59 string str；60 if(e . get source()=comb)61 str=comb . getselecteditem()。tostring()；62 ta.append(n國(guó)籍： str=ActionEvent事件)；63

7、64 65，checkbox demo.java，1 import Java . awt . *；2 import Java . awt . event . *；3 import javax . swing . *；4 public class checkbox demo extends jframe implements item listener 5 private jtextfield field；6 private JCheckBox bold，italic7 private int valBold=Font。PLAIN8 private int valitalic=font . pl

8、ain；9 public checkbox demo()10 super(jcheckbox demo)；11 container container=getcontentpane()；12 container . set layout(new flow layout()；13 field=new JTextField(2008年北京歡迎您！20)；14 field.setFont(new Font(例如，F(xiàn)ont .PLAIN，14)；15 container.add(字段)；16 Bold=new JCheckBox(Bold)；17 container . add(bold)；18 It

9、alic=new JCheckBox(Italic)；19 container . add(italic)；20 bold . additem listener(this)；21 italic . additem listener(this)；22 setSize(280，100)；23 set visible(true)；24 25 public void itemstatechanged(項(xiàng)目事件)26 if(事件)。getsource()=bold)27 val bold=bold.Font .BOLD : Font。PLAIN28if(事件。getsource()=italic)29

10、valitalic=italic . is selected()？Font .ITALIC : Font。PLAIN30 field.set font(新font(例如，valBold valItalic，14)；31 32 public static void main(string args)33 new checkbox demo()；34 35，選擇事件ListSelectionEvent類。必須先聲明實(shí)現(xiàn)偵聽(tīng)器對(duì)象的類介面ListSelectionListener，然后通過(guò)JList類的addListSelectionListener()方法注冊(cè)文本框中的偵聽(tīng)器對(duì)象。您可以在List

11、SelectionListener介面的value changed(ListSelectionEvente)方法主體中撰寫相關(guān)程式碼，回應(yīng)listselectionevent事件。，示例9-3 jlist demo.java，1 import Java . awt . *；2 import Java . awt . event . *；3 import javax . swing . *；4 import javax . swing . event . *；5 public class jlist demo extends jframe implements listselectionlist

12、ener 6 jlist list list=null；7 JLabel label=null8 String s=BMW，奔馳，奧迪，本田，皇冠，福特，現(xiàn)代9 public jlistdemo()10j frame f=new j frame(jlistdemo)；11 container content pane=f . get content pane()；12 content pane . set layout(new border layout(0，15)；13 label=new JLabel()；14 list=new j list(s)；15 list . setvisible

13、rowcount(5)；16 list . set border(border factory . createtitledborder(汽車品牌：)；17 list . addlistselectionlistener(this)；18 contentpane.add(標(biāo)簽，border layout . north)；19 content pane . add(new jscroll pane(list)，border layout . center)；20 f.setSize(300，200)；21 f . set visible(true)；22 23 public static vo

14、id main(string args)24 new jlist demo()；25 26 public void value changed(listselectionevent e)27 int tmp=0；28 String stmp=您最喜歡的汽車品牌是3360。29 int index=list . getselectedindices()；用于30(int I=0；I index.lengthI)31 tmp=indexi；32 stmp=stmp stmp33 34 label . settext(stmp)；35 36，執(zhí)行效果，復(fù)雜布局管理器網(wǎng)格包布局(GridBagLayo

15、ut類)，例如gridbaglayoutdemo.java，1 import Java . awt . *；2 import javax . swing . *；3 public class gridbaglayoutdemo extends jframe 4 protected void add button(string name，gridbag layout gridbag，5 gridbag constrain)8 getContentPane()。add(button)；9 10 public gridbaglayoutdemo()11 gridbag layout gridbag=

16、new gridbag layout()；12 gridbagconstraints c=new gridbagconstraints()；13setfont (new font (sans serif，font.plain，14)；14集布局(grid bag)；15 c . fill=gridbagconstraints . both；16 c.weightx=1.017 addbutton(Button1，gridbag，c)；18 addbutton(Button2，gridbag，c)；19 addbutton(Button3，gridbag，c)；20c .grid width=gridbagconstraints . remainder；/最后一個(gè)組件21 addbutton(Button4，gridbag，c)；22 c.weightx=0.0/恢復(fù)默認(rèn)值44，23 add button(button 5，gridbag，c)；24c .grid width=gridbagconstraints . relative；/倒數(shù)第二個(gè)組件25 addbutton(Bu