publicclasspublicstaticvoidmain(Stringint}publicstaticintf(int{if(x==1||returnreturnf(x-1)+f(x-}}或publicclasspublicstaticvoidmain(Stringintmathmymath=new}}class{publicintf(int{if(x==1||returnreturnf(x-1)+f(x-}}【程序2 publicclasspublicstaticvoidmain(Stringintmathmymath=new}}class{publicintf(int{if(x==1||returnreturnf(x-1)+f(x-}publicbooleaniszhishu(int{for(intif(x%2==0returnfalse;returntrue;}} 題目：打印出所有的"水仙花數(shù)"，所謂"水仙花數(shù)"是指一個(gè)三位數(shù)，其各位數(shù)字立方和等于該數(shù)本身。例如：153是一個(gè)"水仙花數(shù)"，因?yàn)?53=1的三次方＋5的三次方＋3的三次方。publicclasspublicstaticvoidmain(Stringintmathmymath=new}}class{publicintf(int{if(x==1||returnreturnf(x-1)+f(x-}publicbooleaniszhishu(int{for(intif(x%2==0returnfalse;returntrue;}publicbooleanshuixianhua(int{inti=0,j=0,k=0;i=x/100;j=(x%100)/10;k=x%10;returntrue;return}} (2)如果nk，但n能被k整除，則應(yīng)打印出k的值，并用n除以k的商,作為新的正整數(shù)你,重復(fù)執(zhí)行第一步。publicclasspublicpublicvoidfengjie(intfor(int}}}publicstaticvoidmain(String[]args){Stringstr="";exp2c=newint}catch(NumberFormatExceptione){}}}【程序5 >importpublicclassex5publicstaticvoidmain(String[]args){Stringstr="";int}catch(NumberFormatExceptione){}}【程序6 publicclasspublicstaticvoidmain(String{}staticintcommonDivisor(intM,int{{return-}{System.out.println("thebiggestcommondivisorisreturn}return}}importjava.util.Scanner;publicclassCandC{publicstaticint(intm,int{while{if((m=m%n)==returnif((n=n%m)==return}}publicstaticvoidmain(Stringargs[])throws{//Scannerchin=new//inta=chin.nextInt(),b=inta=23;intintc=(a,System.out.println("最小公倍數(shù)：a*bc\n最大公約數(shù)：}}【程序7 1.while語(yǔ)句,'\nimportpublicclassex7publicstaticvoidmain(String{Scannerscan=newScanner(System.in);Stringstr=scan.next();StringE1="[\u4e00-\u9fa5]";StringE2="[a-zA-Z]";intintchar[]String[]arrStr=newfor(inti=0;i<arrChar.length;i++{}for(Stringi:arrStr{if{}if{}}}}【程序8】 題目：求s=a+aa+aaa+aaaa+aa...a的值，其中a是一個(gè)數(shù)字。例如2+22+222 共有5個(gè)數(shù)相加)，幾個(gè)數(shù)相加有鍵盤控制。importpublicclassSumlooppublicstaticvoidmain(String[]args)throws{intStringBufferedReaderstadinnewBufferedReader(newInputStreamReader(System.in));Stringinputfor(inti{inta=Integer.parseInt(output);}}}另解importpublicclassSumlooppublicstaticvoidmain(String[]args)throws{ints=0;intn;intt=0;BufferedReaderstadin=newBufferedReader(newInputStreamReader(System.in));Stringinput=stadin.readLine();for(inti=1;i<=n;i++){}}}【程序9】題目：一個(gè)數(shù)如果恰好等于它的因子之和，這個(gè)數(shù)就稱為"完數(shù)"。例如6=1＋2＋3.編程 publicclassWanshupublicstaticvoidmain(String[]{intfor(int{for(intif(i%j==0)System.out.print(i+"}}}【程序10】題目：一球從100米高度自由落下，每次落地后反跳回原高度的一半；再落下，求它在 經(jīng)過(guò)多少米？第10次反彈多高？publicclassEx10publicstaticvoidmain(String[]{doubledoublefor(int{}}}【程序11 publicclassWanshupublicstaticvoidmain(String[]{inti=0;intj=0;intk=0;intif(i!=j&&j!=k&&}System.out.println}}【程序12】題目：企業(yè)的獎(jiǎng)金根據(jù)利潤(rùn)提成。利潤(rùn)(I)低于或等于10萬(wàn)元時(shí)，獎(jiǎng)金可提10%；利潤(rùn)高于10萬(wàn)元，5%；4060403%；6010060萬(wàn)元的部分可提成1.5%，高于100萬(wàn)元時(shí)超過(guò)100萬(wàn)元的部分按1%提成從鍵盤輸入當(dāng)月利潤(rùn)I，求應(yīng)獎(jiǎng)金總數(shù)？importjavapublicclasstestpublicstaticvoidmaindoublesum;//要的變量應(yīng)發(fā)的獎(jiǎng)ScannerinputnewScannerSystem.in);//導(dǎo)入掃描器System.out.print("輸入當(dāng)月利潤(rùn)");doublelirun=inputnextDouble();//}elseif(lirun<=200000){}elseif(lirun<=400000){}elseif}elseif(lirun<= }}}}131.10100268后再開方，如果開方后的結(jié)果滿足如下publicclasstestpublicstaticvoidmainlongif(Math.floor(Math.sqrt(k+100))==Math.sqrt(k+100)&&}}3時(shí)需考慮多加一天。importjava.util.*;publicclasstest{publicstaticvoidmainintday=0;intmonth=0;intyear=0;intsum=0;intleap;Scannerinput=newScanner(System.in);switch(month/*先計(jì)算某月以前月份的總天數(shù){casecasecasecasecasecasecasecasecasecasecasecaseSystem.out.println("data}sum=sum+day/*再加上某天的天數(shù)if(leap==1&&month>2)/*如果是閏年且月份大于2,總天數(shù)應(yīng)該加一天*/System.out.println("Itisthethe}}importpublicclasstestpublicstaticvoidmaininti=0;intj=0;intk=0;intScannerinput=newScanner(System.in);{}{}{}System.out.println(i+","+j+",}}169*9publicclassjiujiupublicstaticvoidmain(String[]{intint{}}}publicclassjiujiupublicstaticvoidmain(String[]{intint{}}}publicclassjiujiupublicstaticvoidmain(String[]{intint{}}}17】題目：猴子吃桃問(wèn)題：猴子第一天摘下若干個(gè)桃子，當(dāng)即吃了一半，還不癮，又多吃了一個(gè)第二天早上又將剩下的桃子一半，又多吃了一個(gè)。以后每天早上都吃了前一天剩下的一半零一個(gè)。到第10天早上想再吃時(shí)，見只publicclassstaticinttotal(intif(day==return}return}}publicstaticvoidmain(String[]{}}人向隊(duì)員打聽比賽的。a說(shuō)他不和x比，c說(shuō)他不和x,z比，請(qǐng)編程序找出三隊(duì)賽手的。1.程序分析：判斷素?cái)?shù)的方法：用一個(gè)數(shù)分別去除2到sqrt(這個(gè)數(shù))，如果能被整除， importpublicclasspang{Stringa,b,c;publicstaticvoidmain(String[]args){String[]op={"x","y","z"};ArrayList<pang>arrayList=newArrayList<for(inti=0;i<3;i++)for(intj=0;j<3;j++)for(intk=0;k<3;k++){panga=new}}for(Objecta:arrayList){}}publicpang(Stringa,Stringb,Stringc)this.a=a;this.b=b;this.c=}publicStringtoString()//TODOAuto-generatedmethod}}19】題目：打印出如下圖案（菱形** publicclassStartGpublicstaticvoidmain(String[]{intint{for(j=1;j<=2*i-1;j++)}{for(j=1;j<=2*i-3;j++)}}}publicclassStartGpublicstaticvoidmain(String[]{intint{for(intk=1;k<=4-i;k++)System.out.print("");}{for(intk=1;k<=5-i;k++)System.out.print("");}}}【程序20 publicclasstest20publicstaticvoidmain(String[]args)floatfm=1f;floatfz=1f;floattemp;floatsum=0f;for(inti=0;i<20;i++){temp=fm;fm=fz=fz+temp;sum+=fz/fm;}}}【程序21 publicclassEx21staticlongsum=staticlongfac=publicstaticvoidmain(String[]args)longsum=longfac=for(inti=1;i<=10;i++){fac=fac*i;sum+=}}}【程序22 importjava.util.Scanner;publicclassEx22{publicstaticvoidmain(String[]args){Scanners=newScanner(System.in);intn=s.nextInt();Ex22tfr=newEx22();}publiclongrecursion(intn)longvalue=0if(n==1||n==0){value=1;}elseif(n>1)value=n*recursion(n-}return}} 2歲。問(wèn)第4個(gè)人歲數(shù)，他說(shuō)比第32歲。問(wèn)第三個(gè)人，又說(shuō)比第2兩歲。問(wèn)第2個(gè)人，說(shuō)比第一個(gè) 推到第一人（10歲，再往回推。publicclassEx23staticintgetAge(intifreturn}return2+getAge(n-}publicstaticvoidmain(String[]args){System.out.println("第五個(gè)的為:"+getAge(5));}}【程序24 importpublicclassEx24publicstaticvoidmain(String[]args){Ex24tn=newEx24();Scanners=newlonga=if(a<0||a>100000)System.out.println("ErrorInput,pleaserunthisprogramAgain");}if(a>=0&&a<=9){System.out.printlna是一位數(shù)");System.out.println("按逆序輸出是\n}elseif(a>=10&&a<=99){System.out.println(a+"是二位數(shù)");System.out.println("按逆序輸出是}elseif(a>=100&&a<=999){System.out.println(a+"是三位數(shù)");System.out.println("按逆序輸出是elseif(a1000&&a9999System.out.println(a+"是四位數(shù)");System.out.println("按逆序輸出是elseif(a10000&&a99999){System.out.println(a+"是五位數(shù)");System.out.println("按逆序輸出是");}}publicvoidconverse(longl){Strings=Long.toString(l);char[]ch=for(inti=ch.length-1;i>=0;i--){}}}【程序25 importpublicclassEx25staticint[]a=newint[5];staticint[]b=newpublicstaticvoidmain(String[]args)booleanisScanners=newlongl=if(l>99999||l<10000)System.out.println("Inputerror,pleaseinputagain!");l=s.nextLong();}for(inti=4;i>=0;i--)a[i]=(int)(l/(long)Math.pow(10,i));l=(l%(long)Math.pow(10,i));}for(inti=0,j=0;i<5;i++,j++)b[j]=}for(inti=0,j=4;i<5;i++,j--)if(a[i]!=b[j]){is=false;}else{is=true;}}if(is==false)System.out.println("isnota}elseif(is==true){System.out.println("isaPalindrom!");}}} importpublicclassEx26publicstaticvoidmain(String[]charScannerinput=newScanner(System.in);Stringletter=input.next();if(letter.length()==charweekFirst=switchcasecasecase't':caseletter=if(letter.length()==weekSecond=letter.charAt(0);if(weekSecond=='U'||weekSecond=='u'){elseif(weekSecond'H||weekSecond'h'){}}}else}casecasecase'f':casecase's':caseletter=if(letter.length()==weekSecond=letter.charAt(0);if(weekSecond=='A'||weekSecond=='a'){elseif(weekSecond'U||weekSecond'u'){}}}}}}}}}【程序27 publicclassEx27publicstaticvoidmain(String{int{{}}}}【程序28 1.9個(gè)比較過(guò)程中，選擇一個(gè)最小的與第一個(gè)元素交換，下次類推，即用第二個(gè)元素8個(gè)進(jìn)行比較，并進(jìn)行交換。importjava.util.Arrays;importjava.util.Random;importjava.util.Scanner;publicclassEx28{publicstaticvoidmain(String[]args)intarr[]=newint[11];Randomr=newRandom();for(inti=0;i<10;i++){}for(inti=0;i<arr.length;i++){}System.out.print("\nPleaseInputaintnumberScannersc=newScanner(System.in);for(inti=0;i<arr.length;i++){}}}【程序29 publicclassEx29publicstaticvoidmain(String[]doubleintarray[][]={{1,2,3},{4,5,for(intfor(intsum=sum+}System.out.println(}}【程序30 importpublicclassArraySortpublicstaticvoidmain(String[]{intintmyarr[]=newint[12];Randomr=newRandom();for(inti=1;i<=10;i++)for(intk=1;k<=10;k++)for(inti=1;i<=9;i++)for(int{}for(intk=1;k<=10;k++)for(int{for(intj=11;j>=k+1;j--)}for(intk=1;k<=11;k++)}}【程序31】 for(intk=11;k>=1;k--)【程序32】 題目：取一個(gè)整數(shù)a從右端開始的4～7位。a441,0的數(shù)?？捎脋(~0<4)publicclassEx32publicstaticvoidmain(String[]{intlong a=(int)Math.floor(b%Math.pow(10,7)/Math.pow(10,3));}}331 publicclassEx33publicstaticvoidmain(Stringintinta=newint[8][8];}}}System.out.printf(""+a[i][j]);}}}}【程序34 publicclassEx34publicstaticvoidmain(String[]{int[]arrays=for(inti=arrays.length;--{for(int{{inttemp=arrays[j];}}}for(intn=0;n<arrays.length;n++)}}【程序35 importpublicclassEx35publicstaticvoidmain(String[]args)inti,min,max,n,temp1,intScannerkeyboardnewScanner(System.in);n=keyboard.nextInt();a=newfor(i=0;i<n;i++)System.out.print("輸入第i1個(gè)數(shù)據(jù)");a[i]=keyboard.nextInt();}max=0;min=for(i=1;i<n;i++)if(a[i]>maxi遍歷數(shù)組,如果大于a[max]，就把他的數(shù)組下標(biāo)賦給if(a[i]<mini同上，如果小于a[min],就把他的數(shù)組下標(biāo)賦給}temp1=a[0];temp2a[min這兩個(gè)tempa[0]=a[maxtemp1首先交換a[0]和最大值if(min0如果最小值不是a[0]，執(zhí)行下面a[min]=a[n-1];a[n1temp2交換a[min]和a[n-}else{ a[max]=a[n-1];a[n-1]=}for(i0ini輸出數(shù)組System.out.print(a[i]+"");}}}【程序36 題目：有n個(gè)整數(shù)，使其前面各數(shù)順序向后移m個(gè)位置，最后m個(gè)數(shù)變成最前面的m個(gè)37題目：有n個(gè)人圍成一圈，順序排號(hào)。從第一個(gè)人開始報(bào)數(shù)（13報(bào)數(shù)3的人退出圈子，問(wèn)最后留下的是原importpublicclassEx37publicsta