中关村中心-笔试题记

一．java1．publicclassTest2staticbooleanfoo(char}publicstaticvoidmain(String[]{inti=for(foo('A');foo('B')&&(i<2);{}}}WhatistheCompilationAnexceptionisthrownat//输出结果是就像这里，虽然是打印的字母，但是却不是false，所以可以执行foo('BB，i=0,比较(i2true，进行循环体，foo('D'Dfoo('C')打印字母Cfoo('BB，i=1,比较(i2true，进行循环体，foo('D'Dfoo('C')打印字母C<就相当于%符号，所以是例：interfaceAintx=0;}ClassB{intx=1;}ClassCextendsBimplementsPublicvoidPublicstaticvoidmain(String[]args){new}答：此段程序在编译期间会发生错误，不同的JVM有不同的信息，意思就是调用xJVMxx，这两个都是匹配的，就像引用了java.util.Date和java.sql.Date这两个类型的date一样，对于父类的变量，可以用用输出结果为0.。publicstaticvoidmain(String[]{StringintSystem.out.println("n1: }privatestaticinttest(String...{try}catch(NullPointerException{returne){return2;return}答案：publicstaticvoidmain(String[]{int }privatestaticint{inttryreturn}catch(Exceptione)return}}publicclasscountMonkeypublicstaticvoidmain(String[]{inti,m,j=0,k,count;for(i=4;i<10000;i+=4){elsebreak;System.out.println("原有桃子"+j}}}}publicclassprintpublicstaticvoidmain(String[]{int[][]a=newint[10][10];for(inti=0;i<10;i++){a[i][i]=a[i][0]=}for(inti=2;i<10;{for(intj=1;j<i;j++)a[i][j]=a[i-1][j-1]+a[i-1][}}for(inti=0;i<10;i++)for(intk=0;k<2*(10-i)-1;k++)}for(intj=0;j<=i;{System.out.print(a[i][j]+"}}}}publicclasspublicstaticvoidmain(String[]{intn= } staticlongdiGui(int{if(n==1)return} n*diGui(n-}}intj;publicstaticvoidmain(StringIncinc=tt.newInc();for(inti=0;i<2;i++){}}inc(){}dec(){j--;}classIncimplementsRunnable{publicvoidfor(int}}}classDecRunnable{publicvoidrun(){i=0;i<100;i++){de}}}}publicclasspublicstaticvoidmain(String[]{intcount=0;for(intx=1;x<5;x++){for(inty=1;y<5;y++)for(intz=1;z<5;z++)if(x!=y&&y!=z&&x!={countSystem.out.println(x*100+y*10+z}}}}}}在公式中a代表一个数字。例如6+66+666 publicclasspublicstaticvoidmain(String[]{longa,b=0,sum=Scanners=newScanner(System.in);System.out.print(a=s.nextInt();intn=s.nextInt();inti=0;while(i<n)b=b+sum=sum+b;a=a*10;++}}}importpublic publicstaticvoidmain(String[]{intyear,month,day;intdays=0;intd=0;inte; fymd=newInprint();do{e=year=fymd.input();month=fymd.input();day=fymd.input();if(year<0||month<0||month>12||day<0||day>{e=1}}while(for(inti=1;i<month;{switch(i)casecasecasecasecasecasecasecase4:casecasecasecase2:if((year%400==0)||(year&3==0&&year%100!=0))days=}elsedays=}}d+=}System.out.println(yearmonthday(d+day)}}classpublicint{intvalue=Scanners=newScanner(System.in);value=s.nextInt();return}}publicclasspublicstaticvoidmain(String[]{for(inti=1;i<10;i++)for(intj=1;j<=i;j++)System.out.print(j+"*"+i+"="+j*i+" if(j*i<10){System.out.print("");}}}}}publicclasspublicstaticvoidmain(String[]{longsum=sum(20);}privatestaticlongsum(intn{longsum=longfac=for(inti=1;i<=n;{fac=fac*sum+=}return}}publicstaticvoidmain(String[]{Scanners=newbooleanflag=true;longnum=s.nextLong();char[]ch=ss.toCharArray();intj=ch.length;for(inti=0;i<j/2;i++)}}else}}publicstaticvoidmain(String[]{Scanners=newScanner(System.in);int[][]arr=newint[3][3];for(inti=0;i<3;i++){for(intj=0;j<3;{arr[i][j]=}}System.out.println("3*3for(inti=0;i<3;i++){for(intj=0;j<3;j++){System.out.print(arr[i][j]+"}}intsum=for(inti=0;i<3;i++){for(intj=0;j<3;j++){if(i==j)sum+=arr[i][}}}}一个数如果恰好等于他的因子之和，这个数就称之为完数，例如6=1+2 publicclasspublicstaticvoidmain(String[]args){ints;i=1;i<=1000;i++){s=j=1;j<i;j++){==0)}}}}Strings=“abc-eee-ppp”返回[“abc”,”eee”,”PublicstatieString[]getArray(Strings,charmark)}publicstaticvoidmain(String[]{Strings="abc-eee-ppp";String[]strs for(Stringss:strs){}}publicstaticString[]getArray(Strings,String{StringTokenizerst=newString[]strs=newString[count];inti=0;strs[i]=(String)st.nex i++;}return}publicclasslianxi01publicstaticvoidmain(String[] System.out.println("第2个月的兔子对数: intf1=1,f2=1,f,M=24;for(inti=3;i<=M;{f=f2=f1+f2;f1=f;}}}打印出(1)如果这个质数恰等于n，则说明分解质因数的过程已经结束，打印出即可。nknkknk数你n,重复执行第一步。importjava.util.*;publicstaticvoidmain(String[]ScannersnewScanner(System.in);intn=s.nextInt();intwhile(k<=n){if(k==n)}elseif(n%k=={System.out.print(k+"*");n=n/}else}}}次时，共经过多少米第10次反弹多publicclasslianxi10publicstaticvoidmain(String[]{doubleh=100,s=100;for