文檔設計模式

設計題編寫代碼比較使用迭代器遍歷鏈表和使用get(intindex)方法遍歷鏈表所有的時間。mportjava.util.*;publicclassTestSpeed{ publicstaticvoidmain(String[]args){ LinkedList<String>list=newLinkedList<String>(); for(inti=0;i<=60096;i++){ list.add("speed"+i); } Iterator<String>iter=list.iterator(); longstarttime=System.currentTimeMillis(); while(iter.hasNext()){ Stringte=iter.next(); } longendTime=System.currentTimeMillis(); ; longresult=endTime-starttime; System.out.println("使用迭代遍歷集合所用時間"+result+"毫秒"); starttime=System.currentTimeMillis(); for(inti=0;i<list.size();i++){ Stringte=list.get(i); } endTime=System.currentTimeMillis(); result=endTime-starttime; System.out.println("使用get方法歷集合所用時間"+result+"毫秒"); }}編寫?zhàn)I漢式和懶漢式單件模式示意代碼，并說明這兩種方式的適應性。（1）餓漢式：publicclassSingleton{ privatestaticSingletonunigueInstance=newSingleton(); privateSingleton(){} publicstaticSingletongetInstance(){ returnunigueInstance; }}（2）懶漢式：publicclassSingleton{ privatestaticSingletonunigueInstance; privateSingleton(){} publicstaticsynchronizedSingletongetInstance(){ if(unigueInstance==null){ unigueInstance=newSingleton(); } returnunigueInstance; }}以下你看到的類和接口是取自一個動作冒險游戲，它們代表游戲角色(Character)的類和角色可以使用的武器行為的類。每個角色一次只能使用一種武器，但是可以在游戲的過程中換武器。你的工作是使用策略模式實現(xiàn)該游戲的架構。publicabstractclassCharacter{ WeaponBehaviorweapon; publicvoidperformWeapon(){ weapon.useWeapon(); } publicabstractvoidfight(); publicvoidsetWeaponBehavior(WeaponBehaviorw){ this.weapon=w; }}publicclassQueenextendsCharacter{ publicQueen(){ weapon=newKnifeBehavior(); } publicvoidfight(){ System.out.println("皇后在戰(zhàn)斗。"); }}publicclassKingextendsCharacter{publicKing(){publicinterfaceHandler{ publicabstractvoidcompuerMultiply(Stringnumber); publicabstractvoidsetNextHandler(Handlerhandler);}publicclassUseIntimplementsHandler{ privateHandlerhandler; privateintresult=1; publicvoidcompuerMultiply(Stringnumber){ try{ intn=Integer.parseInt(number); inti=1; while(i<=n){ result=result*i; if(result<=0){ System.out.println("超出我的能力范圍，我計算不了"); puerMultiply(number); return; } i++; } System.out.println(number+"的階乘:"+result); } catch(NumberFormatExceptionexp){ System.out.println(exp.toString()); } } publicvoidsetNextHandler(Handlerhandler){ this.handler=handler; }}publicclassUseLongimplementsHandler{ privateHandlerhandler; privatelongresult=1; publicvoidcompuerMultiply(Stringnumber){ try{ longn=Long.parseLong(number); longi=1; while(i<=n){ result=result*i; if(result<=0){ System.out.println("超出我的能力范圍，我計算不了"); puerMultiply(number); return; } i++; } System.out.println(number+"的階乘:"+result); } catch(NumberFormatExceptionexp){ System.out.println(exp.toString()); } } publicvoidsetNextHandler(Handlerhandler){ this.handler=handler; }}importjava.math.BigInteger;publicclassUseBigIntegerimplementsHandler{ privateHandlerhandler; privateBigIntegerresult=newBigInteger("1"); publicvoidcompuerMultiply(Stringnumber){ try{ BigIntegern=newBigInteger(number); BigIntegerONE=newBigInteger("1"); BigIntegeri=ONE; while(pareTo(n)<=0){ result=result.multiply(i); i=i.add(ONE); } System.out.println(number+"的階乘:"+result); } catch(NumberFormatExceptionexp){ System.out.println(exp.toString()); } } publicvoidsetNextHandler(Handlerhandler){ this.handler=handler; }}publicclassApplication{ privateHandleruseInt,useLong,useBig; publicvoidcreateChain(){ useInt=newUseInt(); useLong=newUseLong(); useBig=newUseBigInteger(); useInt.setNextHandler(useLong); useLong.setNextHandler(useBig); } publicvoidreponseCli