2020计算机二级《JAVA》基本操作题模拟

1、2020计算机二级JAVA基本操作题模拟二基木操作题本题提示输入年份，然后判断该年份是否为闰年。importjava-io.*;publicclassjavalpublicstaticvoidmain(Stringargs)InputStreamReaderir;BufferedReaderin;ir=newlnputStreamReader(System.in);in=newBufferedReader(ir);intyear=1900;System,out.print(”请输入年份：”);try(Strings二in.readLine();(Exceptione)i()System.OUt

2、.println(year+fr是|闰年“);elseSystem,out-println(yea:r+不是|闰年);三、简单应用题本题使用下拉菜单来控制字体,口中有一个标签和一个下拉菜单，当选中下拉菜单中的任一项字体时，标签上字符串的字体就随之改亦又Oimportjava.awt.*;importjava.awteevent*;importjavax.swing*;classComboBoxFrameextendsJFramepublicComboBoxFrame()setTitleCjava2setSize(300,200);addWindowListene:r(newWindowAdap

3、ter()publicvoidwindowClosing(WindowEvente)System-exit(0);)；style二newJComboBox():style-setEditable(true);style-addhem(z/Serifz/)；style-additem(,zSansSerifz/)；style-addhem(Monospaced);style,addhem(Dialog);style-addhem(z/Dialoglnput)；styleaddActionListener(this);JPanelp二newJPanel();P.add(style);getCont

4、entPane()add(p,Southff);panel二newComboBoxTestPanel();getContentPane()add(panel,Center);publicvoidactionPerformedQctionEventevt)JComboBoxsource二(JComboBox);Stringitem=(String)source-getSelectedhemO:panel.setStyle(item);privateComboBoxTestPanelpanel;privateJComboBoxstyle;)classComboBoxTestPanelextendsJPanelpublicComboBoxTestPanel()setstyle(Serif);)publicvoidsetStyle(Strings)setFont(newFont(S,Font.PLAIN,12);repaint();)publicvoidpaintComponent(Graphicsg)super.paintComponent(g);9.drawStringCWeicometoChina!,0,50);)publicclassjava2pu