考試Java語言程序設(shè)計一試題課程代碼在每小題列出的四個備選項中只有一個是符合題目要求的，請將其代碼填寫在題2.以下程序代碼的輸出結(jié)果是()while(x>7)A.**B.***C.*D.****U(inta,intb){x=a;y=b;}voidcopy(Ua){x=;y=;}}Uu=newU(1,2),v=newU(2,3);在以下供選擇的代碼中，可能引起系統(tǒng)回收內(nèi)存的是()Stringsl="123"；Strings2="123"；Strings3=newString("123")；，true，false，false，true對象對象對象對象在這個方法中調(diào)用繪圖方法，繪制各種圖形。要重定義的方法是()t9.程序如果要按行輸入輸出文件的字符流，最合理的方法是采用()A存儲查詢結(jié)果B數(shù)據(jù)庫的連接D序的加載和建立數(shù)據(jù)庫連接的字節(jié)碼文件的擴展名是_________。有子Strings="ABCDABCD"；B是_________。______對象分組，使同一組內(nèi)的單選法恢復(fù)。兩個端點分別是，和，。staticintsigmaDigit(intn)while(n>0){d=n%10;_________；n/=10;}_________；}import.*;import.*;classMyPanelextendsJPanel{publicvoidprint(Graphicsg,intx,inty)(;}}classMyWindowextendsJFrameimplementsMouseListener{finalintMaxMarks=20;intcurrentMarks=0,markCount=0;Pointmarks[]=newPoint[MaxMarks];MyPanelpanel;MyWindow(){Containercon=();elnewMyPanel}publicvoidpaintGraphicsg){for(i=0;i<markCount;i++){}}publicvoidmousePressed(MouseEvente){}publicvoidmouseReleased(MouseEvente){}publicvoidmouseEntered(MouseEvente){}publicvoidmouseExited(MouseEvente){}publicvoidmouseClickedMouseEvente){marks[currentMarks]=newPoint(),());arkscurrentMarksMaxMarks}}publicclassClass1extendsApplet{publicvoidinitMyWindowmyWndownewMyWindow();}}classMyWindowextendsJFrameimplementsItemListener{eldtextBoxboxlboxMyWindow(Strings){_________；Containercon=();ieldxaddItemListenerthis}publicvoiditemStateChanged_________e){if()==box1){}elseif()==box2){}}}intnummagemyImagenewnumpublicvoidpaint(Graphicsg){g____(myImage[currentImage],10,10,myImagecurrentImage.getWidth(this),myImagecurrentImagegetHeightthis),this);}publicclassClass1{publicstaticvoidmainStringargs{DatamrcnewShareDataThreadaThreadArraynewThread0];for(inti=0;i<20;i++){dArrayinewThreadnewMyMultiThreadClassmrcdArrayistart}WhileLoop:_________}}}classMyMultiThreadClassimplementsRunnable{DataUseIntegerintdeltaMyMultiThreadClass(ShareDatamrc,intd){UseInteger=mrc;delta=d;}publicvoidrun(){for(inti=0;i<1000;i++){classA{A(inta,intb){xay=b;}}publicclasssample{publicstaticvoidmain(Stringargs[]){Apl,p2;p2=newA(12,15);pp;++;}}staticvoidpascal(intn){pasnewintn];pas[0]=1;for(inti=2;i<=n;i++){pasil=1;forintji-2;j>0;j--)pas[j]=pas[j]+pas[j-1];forintjjij++)}}classMyPanelextendsJPanel{ButtonbuttonJLabellabelMyPanel(Strings1,Strings2){buttonnewJButtonslabel=newJLabel(s2,;addbuttonaddlabeladd(newJLabel());}}publicclassClass1{publicstaticvoidmain(Stringargs[]){JFramemwnewJFrame口");Containercon=();MyPanelpanel,panel2;lJButtonbuttonnewJButton);}}cclassClasspublicstaticvoidmain(Stringargs[]).}xtendsJFrameimplementsActionListenerFieldtextnewJTextFieldeashowAreanewJTextAreaelConnectNetStrings){PanejspnewJScrollPaneshowAreaetrue}publicvoidactionPerformedActionEvente){meeadmyThreadnullpublicvoidstart(){if(myThread==null){myThread=newThread(this);();}}publicvoidrun(){while(myThread!=null){ry}catch(InterruptedExceptione){}}}publicvoidpaint(Graphicsg){}}37.編寫數(shù)組復(fù)制方法。該方法從已知平衡的兩維數(shù)組的左下角復(fù)制出一個非平衡的publ