參考成果講稿

GameLoft1 求下列代碼執(zhí)行以后expr的inta=8,b=4;intexpr=a++%++b*2intexpr=20/8*intexpr=4<<2+注意：+的優(yōu)先級(jí)高于intexpr=-4321intexpr=123^321^intinta=intexpr=(byte)a+(((byte)a)&注意：byteintintexpr= ”.charAt(4)+Integera= newInteger(1234);Integerb= newInteger(1234);booleanexpr=a==Stringfunc(Stringreturns.length()>0?func(s.substring(1))+s.charAt(0):}Stringexpr=2 知識(shí)答案：回收(GC)是Java語言的一個(gè)重要特性，作用是釋放不再被使用的內(nèi)存。垃short的取值范圍。什么是(obfuscate)?有什么好處？有哪些工具可以jar文件答案：是指通過對(duì)class文件中的變量名和部分方法名進(jìn)行處理，來提高代碼反編好處主要有2個(gè)：12class文件的大小。常見的器有Proguard和RetroGuard兩種。答案：狀態(tài)機(jī)(StateMachine)是根據(jù)對(duì)應(yīng)狀態(tài)進(jìn)行處理的一種機(jī)制，在游戲開發(fā)中最典J2MEJavaPythonAntJavacJavaSubversionOpenGL3 const[j2me1]SCREEN_WIDTH=176;const[j2me2]TEXTWORD_SPACE=3;publicstaticvoidDrawString(StringstrText,intposX,intposY,intflagX){intwidth=GetTextWidth(strText);intx,int[j2me3]y=posY;if(flagX>0){x=}elseif(flagX==x=(SCREEN_WIDTH–width)/}}

x=SCREEN_WIDTH–x+=posX;bytefor(inti=0;i<=[j2me5]strText.length();i++){charTemp=strText.charAt(i);if(charTemp<‘!’|charTemp>‘z’){x+=}}

x+=flagXflagX的作用是決定對(duì)齊方式，大于0左對(duì)齊，等于0居中，小于0DrawCharater的返回值有什么意義？charTemp的寬度4 應(yīng)用boolIsOverlapped(intx1,inty1,intr1,intx2,inty2,int

@paramx1x@paramy1y@paramr1@paramx2x@paramy2y@paramr2booleanIsOverlapped(intx1,inty1,intr1,intx2,inty2,intintl=(x1-x2)*(x1-x2)+(y1-y2)*(y1-y2);if(l<(r1+r2)*(r1+r2)){return}}

return@params@returnStringdoString(StringStringtemp=""+s.charAt(0);for(inti=1;i<charc=if(c==''){if(s.charAt(i-1)!='temp+=}}

temp+=return}2、每個(gè)字符的像素寬度不一樣，每個(gè)字符的像素寬度不一樣。用intGetCharWidth(charc)獲得每個(gè)字符的像素寬度。@params@paramscreenWidth@returnintcalcLineNum(Strings,intscreenWidth){intlength=0;intn=for(inti=0;i<intcharLen=lengthcharLen;if(lengthscreenWidth){n++;//行數(shù)lengthcharLen;}}if(length>0){}return}5 Anintegralapproachtocodeationistowritethecodesothatitsitself.Inotherwords,thecodeshouldbenaturallyreadableinsuchawayastomakeeasytounderstand.This plishedbypropernamingconventionsandstatementCollectionsarethedatastructuresthataremosteasilyalteredforperformance-tuningpurposes.Usingthecorrectormostappropriatecollectionclasscanimproveperformancewithlittlechangetocode.Forexample,ifalargeorderedcollectionhaselementsfrequentlydeletedorinsertedthroughoutit,itusuallycanprovidebetterperformanceifbasedonalinkedlistratherthananarray.Ontheotherhand,astatic(unchanging)collectionthatneedstobeaccessedbyindexperformsbetterwithanunderlyingimplement