新疆大学《JAVA程序设计》2019-2020学年期末考试试卷

《JAVA语言设计》试卷B《JAVA语言设计》试卷B一二三四五六A．$millionB．$_milliC．2$_millionD．$2B．若用于比较的数据类型为double型，则不可以用装订线6、下面是有关子类继承父类构造函数的描述，其中正确的是B．子类无条件地继承父类不含参数的构A．大小B．颜色C．名称D．D.类外调用该方法的方式必须是：对象名.方法名(答A表示说法正确.答B表示说法不正确,本题只需指答A表示说法正确.答B表示说法不正确,本题只需指17、使用Thread子类创建线程的优点是可以在子类中增加新的成员变20、对数据库操作时，使用PreparedStatement执行SQL语句，比起21、把编写好的Java源文件保存起来，源文件的装订线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");}装订线}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("收到数据是："+message+"\n");}}catch(Exceptione){System.out.println(e.getMessage());}}启动源代码如下：privateStringbland;privateStringtype;publicabstractvoidstart();public【②】(Stringbland,Stringtype){this.bland=bland;this.type=type;}publicStringtoString(){return"品牌:"+bland+";型号:"+type;}}publicclassBMW【③】Car{publicBMW(Stringbland,Stringtype){【④】(bland,type);publicBMW(Stringbland,Stringtype){【④】(bland,type);}publicvoidstart(){System.out.println("启动");}publicstaticvoidmain(Stringargs[]){Carcar=new【⑤】("宝马","X5");System.out.println(car.toString());car.start();}}序，在⑥~⑩处补充相应的内容，使整个程序能够正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