java程序实例15题附答案

1、java 程序实例 15 题附答案1、public class MyClass( private int vall,vaI2 ;public void myFun(int x,int y)vall=x;val2=y ;11 nSystem.out.println( The sum is: +(vall+val2);public static void main(String arg)MyClass MyObj=new MyClass();MyObj.myFun(l,2);运行结果如下：The sum is: 32、public class MyArray (public static void

2、 main(String args)int myArrayf;声明数组myArray=new int10;创建数组System.outprintln( nIndextt Value'');for(int i=0; ivmyArray.length;i+)System.out.println(i+ * ftt * 1+my Array i);证明数组元素联认初始化为 0/myArray 10=100;将产生数组越界异常 输出：50503、public class Arrays( public static void main(String args) int al = ( 1,2

3、, 3, 4, 5 ；int a2;a2 = al;for(int i = 0; i < a2.1ength; i+) a2i+;for(int i = 0; i < al.length; i+) System.out.println( "al" + i + '' = " + ali);运行结果：al0 = 2all = 3al2 = 4al3 = 5al 4 = 6 4、 public class ArrayOfStringsDemo public static void main(String args)； for (int i =

4、 0; i < String anArray = "String One", "String Two", "String Three" anArray.length; i+) System.out.println(anArrayi.toLowerCase(); 运行结果： string one string two string three 5、public class ArrayCopyDemo( public static void main(String args) char copyFrom = 'd',

5、 'e', 'c', 'a', f, f, 'e','i', 'n', 'a', f, 'e', 'd' char copyTo = new char7; System.arraycopy(copyFrom, 2, copyTo, 0, 7); System.out.println(new String(copyTo); J 运行结果 : caffeine6、 ex3_l-输入一个年份，判断它是不是闰年。-闰年：能被 4整除但不能被 100 整除，或者

6、能被 400整除。 import java.io.*;public class ex3_l(public static void main(String args) throws IOException(int year;boolean IsLeapYear;System.out.println("Enter the year:");BufferedReader in =new BufferedReader( new InputStreamReader(System.in);year=(new Integer(in.readLine().intValue();IsLeapY

7、ear=(year%4=0 && year% 100 != 0)ll(year%400 = 0);if (IsLeapYear)System.out.print(year);System.out.println( "is a leap year");elseSystem.out.print(year);System.out.println( "is not a leap year");7、输入两个整数比较大小import java.io.*;public class ex3_2(public static void main(String

8、 args)throws lOExceptionint x,y;BufferedReader in = new BufferedReader(new InputStreamReader(System.in);System.out.println("Enter x and y:n);x=(new Integer(in.readLine().intValue();y=(new Integer(in.readLine().intValue();if (x!=y)if (x>y) System.out.println("x>y n);elseSystem.out.pri

9、ntln(nx<yn);else System.out.println(nx=yn);80-89 分为 B 级;（0 对应星期日 ）8、已知一个学生的分数，给出其分数等级。 90-100 分为 A 级；70-79分为C级；60-69分为D级；0-59分为E级public class IfElseDemo (public static void main(String args) (int testscore = 76;char grade;if (testscore >= 90) ( grade = 'A' )else if (testscore >= 80)

10、 ( grade = 'B' else if (testscore >= 70) ( grade = C; else if (testscore >= 60) ( grade = 'D' else grade = F; System.out.println("Grade = " + grade); J或public class Grade (public static char gradeLevel(double g)(int n = (int)Math.floor(g/10);switch (n)(case 10:case 9

11、: retum('A');case 8 : retum('B');case 7 : retum('C');case 6 : retum('D');default: retum('E');public static void main(String args)( System.out.println("gradeLevel(100)="+gradeLevel(100); System.out.println(,gradeLevel(95.5)="+gradeLevel(95.5);Sys

12、tem.out.println("gradeLevel(88)="+gradeLevel(88); System.out.println("gradeLevel(72)="+gradeLevel(72);System.out.println(',gradeLevel(68.5)="+gradeLevel(68.5); System.out.println("gradeLevel(60)="+gradeLevel(60);System.out.println(',gradeLevel(59.5)="+

13、gradeLevel(59.5); System.out.println("gradeLevel(35)="+gradeLevel(35);9、输入 0? 6 之间的某一个整数，然后把它转换成星期输出。 import java.io.*;public class ex3_3(public static void main(String args)throws lOExceptionint day;BufferedReader in =new BufferedReader(new InputStreamReader(System.in); day=(new Integer(i

14、n.readLine().intValue(); switch (day)(n1case 0: System.out.println( nSunday* 1);break;case 1: System.outprintln( nMonday* 1);break;case 2: System.outprintln( nTuesdayn); break;case 3: System.out.println( nWednesday n); break;case 4: System.outprintln( nThursday n); break;case 5: System.outprintln( n

15、Friday n); break;case 6: System.outprintln( nSaturday* 1); break; default:Sy stem .out.println( n Day out of range Sunday .Saturday 0 ); break; 10、打印九九乘数表 public class MultiTable ( public static void main(String args)(for (int i=l; iv=9;i+) ( for (int j=l; j<=i;j+)System, out. print。 ” +i+ ”*”+j+

16、 ” =” +i*j); S ystem.out.println();11、输入一个整数，输出它所有的因数 import java.io.*; public class ex3_7public static void main(String args) throws IOException( int n,k; BufferedReader in =new BufferedReader(new InputStreamReader(System.in); System.out.println("Enter a positive integer:"); n=(new Intege

17、r(in.readLine().intValue(); System.out.print( "Number” +n+" Factors ");for (k=l; k <= n; k+)if (n % k = 0) System.out.print(k + ""); System.out.println();12、计算数列 1,2,.,10 的和。 public class ex3_4public static void main(String args)int i=l, sum=0;while(i<=10) ( sum+=i; i+

18、；)S y stem.out .println(" sum="+sum);'13、输入一个整数，然后输出它的翻转形式import java.io.*;public class ex3_5(public static void main(String args)throws IOException( int n, right_digit, newnum = 0;BufferedReader in = new BufferedReader(new InputStreamReader(System.in);System.out.println("Enter th

19、e number:");n=(new Integer(in.readLine().intValue(); System.out.print(nThe number in reverse order is "); do right_digit = n % 10;System.out.print(right_digit); n/= 10;while (n != 0);System.out.println();14、public class BreakTest (public static void main( String args ) (String output =int i;for (i = l;i<= 10; i+) (if (i = 5 ) break; / break loop only if count = 5 output += i