2010JAVA笔试题.doc

写出下列程序运行的结果1public class SignFunction public static void main(String args) int intx; intx=0; if(intx0) System.out.println(The sign of +intx+ is + ;); else if(intx0) System.out.println(The sign of +intx+ is - ;); else System.out.println(The sign of +intx+ is 0 ;); 程序执行结果为：( 0 )；2 /Sum.java源代码如下：public class Sumpublic static void main(String args)int j=10;System.out.println(j is : +j);calculate(j);System.out.println(At last,j is : +j);static void calculate(int j)for (int i=0;i10;i+)j+;System.out.println(j in calculate() is: +j);输出结果为：j is : (1) j in calculate() is :(2) At last j is : (3) 答案： j is : 10j in calculate() is: 20At last,j is : 103class UseArrayCopypublic static void main(String args) int a=1,2,3,4,5,6,7; int b=new int6; int i; System.arraycopy(a,1,b,2,3); for(i=0;i= 90) grade = A; else if (score = 80) rade = B; else if (score = 70) grade = C; else if (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public class UserExceptionDemo1public static void main(String args) int a,b; try a=10;b=0; int c=Divide(a,b); System.out.println(a+/+b+=+c); catch(ArithmeticException e) System.out.println(Divided by zero error!); System.out.println(After try-catch.);static int Divide(int x,int y) return x/y;程序运行结果为：( Divided by zero error!After try-catch. )；五、程序阅读填空1、完成求n!的程序public class Testpublic static void main(String args) factorial(3);factorial(6);factorial(9);static (1) factorial(int n)long m=1;for (int x=1;x=n; (2) ) (3) ;System.out.println(n+!=+m);六、编程题1使用dowhile循环，计算1至2000之间的所有奇数的和。解：static int Divide() int i = 1; / i初始值为1int sum = 0;do sum += i;i += 2; while (i 2000);return sum;2编程将字符串Mary was a改为Mary had a book.。 StringBuffer str1=new StringBuffer(Mary was a); StringBuffer str2=str1.replace(5,10,had a book.); System.out.println(str2);3计算1！+2！+3！+10！。int i;long j = 1, s = 0;for (i = 1; i = 10; i+) j *= i;s += j;System.out.println(s);4编写一个程序，用选择法对数组a=20,10,50,40,30,70,60,80,90,100进行从大到小的排序。int a = 20, 10, 50, 40, 30, 70, 60, 80, 90, 100 ;int i, n, max;for (i = 0; i = 8; i+) for (n = i + 1; n = 9; n+) if (ai an) max = ai;ai = an;an = max;for (i = 0; i = 9; i+) System.out.print(ai + );5输出九九乘法表。int i