2010JAVA笔试题

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1、写出下列程序运行的结果1．publicclassSignFunction{publicstaticvoidmain(Stringargs[]){intintx;intx=0;if(intx>0)System.out.println("Thesignof"+intx+"is+;");else{if(intx<0)System.out.println("Thesignof"+intx+"is-;");elseSystem.out.println("Thesignof"+intx+"is0;");}}}程序执行结果为：(0)；2．//Sum.java源代

2、码如下：publicclassSum{publicstaticvoidmain(String[]args){intj=10;System.out.println("jis:"+j);calculate(j);System.out.println("Atlast,jis:"+j);}staticvoidcalculate(intj){for(inti=0;i<10;i++)j++;System.out.println("jincalculate()is:"+j);}}输出结果为：jis:(1)jincalculate()is:(2)Atlastjis

3、:(3)答案：jis:10jincalculate()is:20Atlast,jis:103．classUseArrayCopy{publicstaticvoidmain(Stringargs[]){inta[]={1,2,3,4,5,6,7};intb[]=newint[6];inti;System.arraycopy(a,1,b,2,3);for(i=0;i

4、licstaticvoidmain(String[]args){intscore=86;chargrade;if(score>=90){grade='A';}elseif(score>=80){rade='B';}elseif(score>=70){grade='C';}elseif(score>=60){grade='D';}else{grade='E';}System.out.println("Grade="+grade);}}程序执行结果为：(Grade=B)；5．处理除数为0的异常publicclassUserExceptionDemo1{

5、publicstaticvoidmain(Stringargs[]){inta,b;try{a=10;b=0;intc=Divide(a,b);System.out.println(a+"/"+b+"="+c);}catch(ArithmeticExceptione){System.out.println("Dividedbyzeroerror!");}System.out.println("Aftertry-catch.");}staticintDivide(intx,inty){returnx/y;}}程序运行结果为：(Dividedbyzer

6、oerror!Aftertry-catch.)；五、程序阅读填空1、完成求n!的程序publicclassTest{publicstaticvoidmain(Stringargs[]){factorial(3);factorial(6);factorial(9);}static(1)factorial(intn){longm=1;for(intx=1;x<=n;(2))(3);System.out.println(n+"!="+m);}}六、编程题1．使用do~while循环，计算1至2000之间的所有奇数的和。解：staticintDivide(

7、){inti=1;//i初始值为1intsum=0;do{sum+=i;i+=2;}while(i<2000);returnsum;}2．编程将字符串"Marywasa"改为"Maryhadabook."。StringBufferstr1=newStringBuffer("Marywasa");StringBufferstr2=str1.replace(5,10,"hadabook.");System.out.println(str2);3．计算1！+2！+3！+……+10！。inti;longj=1,s=0;for(i=1;i<=10;i++){

8、j*=i;s+=j;}System.out.println(s);4．编写一个程序，用选择法对数组a[]={20,10,5