新疆大學(xué)《JAVA程序設(shè)計(jì)》2019-2020學(xué)年期末考試試卷

《JAVA語言設(shè)計(jì)》試卷B《JAVA語言設(shè)計(jì)》試卷B一二三四五六A．$millionB．$_milliC．2$_millionD．$2B．若用于比較的數(shù)據(jù)類型為double型，則不可以用裝訂線6、下面是有關(guān)子類繼承父類構(gòu)造函數(shù)的描述，其中正確的是B．子類無條件地繼承父類不含參數(shù)的構(gòu)A．大小B．顏色C．名稱D．D.類外調(diào)用該方法的方式必須是：對(duì)象名.方法名(答A表示說法正確.答B(yǎng)表示說法不正確,本題只需指答A表示說法正確.答B(yǎng)表示說法不正確,本題只需指17、使用Thread子類創(chuàng)建線程的優(yōu)點(diǎn)是可以在子類中增加新的成員變20、對(duì)數(shù)據(jù)庫操作時(shí)，使用PreparedStatement執(zhí)行SQL語句，比起21、把編寫好的Java源文件保存起來，源文件的裝訂線classA{A(){System.out.println(“A”);doublef(doublex,doubley){}ClassBextendsA{B(){System.out.println(“B”);doublef(doublex,doubley){}publicclassTest{}returnx*y;}}returnx+y;}publicstaticvoidmain(Stringargs[]){Aobj=newB();System.out.println("Theprogramoutputis"+obj.f(4,6));}}Connectionconn=DBTool.getConnection();try{Stringsql="selectcount(*)frommanagerwhereusername=?andpassword=?";PreparedStatementpst=conn.prepareStatement(sql);pst.setString(1,userName);pst.setString(2,password);ResultSetrs=pst.executeQuery();intcount=0;if(rs.next()){count=rs.getInt(1);}}catch(SQLExceptione){e.printStackTrace();}finally{conn.close();}TreeSet<Integer>set=newTreeSet<Integer>();set.add(2);set.add(5);set.TreeSet<Integer>set=newTreeSet<Integer>();set.add(2);set.add(5);set.add(3);set.add(8);try{ObjectOutputStreambr=newObjectOutputStream(newFileOutputStream("a.txt"));br.writeObject(set);br.close();ObjectInputStreambi=newObjectInputStream(newFileInputStream("a.txt"));TreeSet<Integer>s=(TreeSet)bi.readObject();Iterator<Integer>it=s.iterator();while(it.hasNext()){System.out.println(it.next());}bi.close();}catch(IOExceptione){System.out.println(e.getMessage());}publicclassTestException{publicvoidCreateException()throwsException{thrownewException("newexception");}publicstaticvoidmain(String[]args){TestExceptionte=newTestException();try{System.out.println("trycalledstart");te.CreateException();System.out.println("trycalledend");}catch(Exceptionex){System.out.println("catchcalled");System.out.println(ex.getMessage());}finally{System.out.println("finallycalled");}System.out.print("main()finished");}裝訂線}34.、publicvoidrun(){DatagramPacketpack=null;DatagramSocketmail_data=null;bytedata[]=newbyte[8192];try{pack=newDatagramPacket(data,data.length);mail_data=newDatagramSocket(888);while(true){mail_data.receive(pack);Stringmessage=newString(pack.getData(),0,pack.getLength());System.out.println("收到數(shù)據(jù)是："+message+"\n");}}catch(Exceptione){System.out.println(e.getMessage());}}啟動(dòng)源代碼如下：privateStringbland;privateStringtype;publicabstractvoidstart();public【②】(Stringbland,Stringtype){this.bland=bland;this.type=type;}publicStringtoString(){return"品牌:"+bland+";型號(hào):"+type;}}publicclassBMW【③】Car{publicBMW(Stringbland,Stringtype){【④】(bland,type);publicBMW(Stringbland,Stringtype){【④】(bland,type);}publicvoidstart(){System.out.println("啟動(dòng)");}publicstaticvoidmain(Stringargs[]){Carcar=new【⑤】("寶馬","X5");System.out.println(car.toString());car.start();}}序，在⑥~⑩處補(bǔ)充相應(yīng)的內(nèi)容，使整個(gè)程序能夠正publicclassJ_Test{privateJFramef;privateJButtonbutton1,button2,button3;publicvoidgo(){f=【⑥】JFrame("Test");f.setLayout(newFlowLayout());button1=newJButton("Ok");button2=newJButton("Open");button3=newJButton("Close");f.add(button1);f.add(button2);f.add(button3);f.setSize(160,106);f.setVisible(【⑧】);}publicstaticvoidmain(String[]args){J_Testt=newJ_Test();t.go();}}ClassMonitor【⑨】ActionListener{publicvoid【⑩】(ActionEvente){System.exit(0);}}①②③④