CSI 311L Lab 7, Spring 2012

American University of Science & Technology Department of Computer Science CSI 311L – Java Programming Lab Spring 2011/2012 Lab Work 7 Problem1: Trace the following java applications: a- //Suppose that the generated numbers are: 14 25 46 45 39 public class Lab { public static void main ( String a [] ) { int x[] = new int [5]; for( int i = 0; i < 5; i++ ) x[i] = 1 + (int)(Math.random() * 51); for( int i = 0; i < 5; i++ ) System.out.println( x[i] ); int c = 0; for( int i = 0; i < 5; i++ ) if( x[i] % 2 == 0 ) c++; System.out.println( "Percentage of Even Numbers: " + c * 100 / x.length + "%" ); System.out.println( "Percentage of Odd Numbers: " + ( x.length - c ) * 100 / x.length + "%" ); } } 1 b- class q8 { public static void main(String[] args) { int N = 1000 + 1; // Create Array Boolean p [] = new Boolean [ N ]; // Initialize to TRUE for (int i=0;i<p.length ; i++) p[i] = true; for (int i=2;i<N ;i++) { // skip all FALSE elements if (p[i] == false) continue; // I removed all multiples of 'i' for (int j=i;j*i<N ;j++) p[i*j] = false; } // Print all prime numbers for (int i=1;i<N;i++) { if (p[i] == false) continue;// not prime System.out.println(i + " is prime!"); } } } 2 Problem 2: write a java application to output the following shape: 3 Problem 3: Write the class definitions and implementations for the following class specifications. Instructor Attributes  id: an integer to identify the id of the instructor  name: a String to identify the name of the instructor  highestDegree: a String to identify the highest degree achieved by the instructor  rate: a floating-point value to identify the rate per hour of the instructor Methods  Default constructor  Constructor  set methods  get methods  toString: to return information about an instructor Course Attributes  code: a String to identify the code of the course  name: a String to identify the name of the course  instructor: an object of class Instructor to identify the instructor of the course  hours: an integer to identify the number of hours to be taught for this course Methods  Default constructor  Constructor  set methods  get methods  toString: to return information about a course  compute: to compute the cost of the course A. Write a java application to do the following (Use JOptionPane methods):  Create N objects of class Instructor and let the user initialize them  Create N objects of class Course and let the user initialize them  Compute and display the total cost of all courses  Display information about courses taught by a specific instructor 4