Question

CSC151 JAVA PROGRAMMING LAB #7 OBJECTIVES . . . In this lab assignment, students will learn: To get an overview of exceptions and exception handling • To explore the advantages of using exception handling • To declare exceptions in a method header • To throw exceptions in a method • To write a try-catch block to handle exceptions To develop applications with exception handling To use the finally clause in a try-catch block To write data to a file using the PrintWriter class To use try-with-resources to ensure that the resources are closed automatically • To read data from a file using the Scanner class • To understand how data is read using a Scanner COURSE PREPARATION You should have done your reading assignment listed under "Reading Assignment" and "Video Assignment" sections in BlackBoard. You should also have reviewed the lecture slides in BlackBoard. You have taken the online REVEL quizzes. There is an optional section called "In Case You Don't Know" in BlackBoard for those who are interested to expanding their horizon. WHAT TO SUBMIT For this lab you need to submit the following files: - Salary Generator.java (from Part One) SalaryAnalyzer.java (from Part Two) GRADING RUBRIC: Be sure to follow the Coding Standard Guidelines. You must properly indent and comment your code. This assignment is worth 100 points. • Indent code and insert comments to document your program. [10 pts] • Program must be implemented and run with no syntax errors. [40 pts] Program must be implemented and run with no logic errors. [40 pts] Required source files should be zipped and uploaded to BlackBoard assignment drop box before the deadline. [10 points]

Answer 1

///////////////////////////////////////////// SalaryGenerator.java ////////////////////////////////////////////

// PLEASE LIKE THE SOLUTION
// FEEL FREE TO DISCUSS IN COMMENT SECTION
// JAVA PROGRAM

import java.io.*;
import java.util.*;

// class
public class SalaryGenerator{
   // main method
   // now opening the file to write in try catch block
   public static void main(String arg[]){
       // try with resources
       try(PrintWriter write = new PrintWriter(new File("Salary.txt"))){
           //now for thousands
           String fn = "FirstName";
           String ln = "LastName";
           String rank[] = {"assistant","associate","full"};
           double salary;

           // now for thousands
           for(int i=0;i<1000;i++){
               write.print((fn+(i+1))+" "+(ln+(i+1))+" ");
               // now rank genearte random 0 to 2
               int r = (int)(Math.random()*3);
               if(r == 0){
                   // generate salary
                   salary = Math.random()*(30001)+50000;
                   // now round up to 2 digits
                   salary = Math.round(salary * 100.0) / 100.0;

                   // now write to file
                   write.print(rank[0]+" "+salary+"\n");
               }

               else if(r==1){
                   // generate salary
                   salary = Math.random()*(50001)+60000;
                   // now round up to 2 digits
                   salary = Math.round(salary * 100.0) / 100.0;

                   // now write to file
                   write.print(rank[1]+" "+salary+"\n");
               }

               else if(r==2){
                   // generate salary
                   salary = Math.random()*(55001)+75000;
                   // now round up to 2 digits
                   salary = Math.round(salary * 100.0) / 100.0;

                   // now write to file
                   write.print(rank[2]+" "+salary+"\n");
               }
           }
          
       }

       catch(Exception e){
           // print the message
           System.out.println(e.getMessage());
       }
   }
}

//////////////////////////////////////////////////////////////////////////////////////////

////////////////////// SAMPLE OUTPUT FILE////////////////////////////////

Salary.txt FirstName1 LastName1 assistant 69527.5 FirstName2 LastName2 assistant 56619.33 FirstName3 LastName3 assistant 76650.22 FirstName4 LastName4 full 110194.16 FirstName5 LastName5 associate 76228.92 FirstName6 LastName6 full 108247.14 FirstName7 LastName7 full 100073.29 FirstName8 LastName8 full 126027.79 FirstName9 LastName9 full 83281.16 FirstName 10 LastName 10 full 128687.37 FirstName 11 LastName 11 associate 68654.15 FirstName12 LastName12 assistant 62825.65 FirstName13 LastName 13 associate 108296.0 FirstName 14 LastName 14 associate 108158.94 FirstName15 LastName 15 assistant 76547.05 FirstName 16 LastName 16 assistant 79541.28 FirstName17 LastName 17 assistant 68107.03 FirstName18 LastName18 full 77606.66 FirstName19 LastName19 full 93098.75 FirstName20 LastName20 assistant 56170.4 FirstName 21 LastName 21 associate 100252.31 FirstName22 LastName22 associate 103850.6 FirstName23 LastName23 full 119892.7 FirstName 24 LastName 24 associate 67452.64 FirstName25 LastName25 associate 62762.07 FirstName 26 LastName 26 full 112275.0 FirstName27 LastName27 full 116984.45 FirstName28 LastName28 assistant 63609.4 FirstName29 LastName 29 associate 85760.66 FirstName 30 LastName 30 associate 97564.39

/////////////////////////////// SalaryAnalyzer.java /////////////////////////////////////////////////////////////

import java.io.*;
import java.util.*;

// class
public class SalaryAnalyzer{
   //main method
   public static void main(String arg[]){
       // now read all the data and find the
      
       // read the the file data using try with resources
       try(Scanner scan = new Scanner(new File("Salary.txt"))){
           //now open the file
          

           // read the data and store the analyzed data
           int assistantCount = 0;
           int associateCount = 0;
           int fullCount = 0;
           double assistantTotal = 0;
           double associateTotal = 0;
           double fullTotal = 0;

           // now read the data
           String fn;
           String ln;
           String rank;
           double salary;
           while(scan.hasNext()){
               fn = scan.next();
               ln = scan.next();
               rank = scan.next();
               salary = scan.nextDouble();
              
               // now update
               if(rank.equals("assistant")){
                   assistantTotal += salary;
                   assistantCount++;
               }

               else if(rank.equals("associate")){
                   associateTotal += salary;
                   associateCount++;
               }

               else if(rank.equals("full")){
                   fullTotal += salary;
                   fullCount++;
               }

           }

           // now print the result
           System.out.println("Total Salary of Assistant Professors = "+assistantTotal);
           System.out.println("Total Salary of Associate Professors = "+associateTotal);
           System.out.println("Total Salary of Full Professors = "+fullTotal);

           System.out.println("Average Salary of Assistant Professors = "+(assistantTotal/assistantCount));
           System.out.println("Average Salary of Associate Professors = "+(associateTotal/associateCount));
           System.out.println("Average Salary of Full Professors = "+(fullTotal/fullCount));
       }
       catch(Exception e){
           System.out.println(e.getMessage());
       }
   }
}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

//////////// SAMPLE OUTPUT ///////////////////

kashyap@kashyap-Inspiron-3542:-/Pictures/cch$ javac salaryAnalyzer.java kashyap@kashyap-Inspiron-3542:-/Pictures/cch$ java SalaryAnalyzer Total salary of Assistant Professors = 2.080405613000001E7 Total salary of Associate Professors 2.9535428420000006E7 Total salary of Full Professors = 3.458237160000001E7 Average salary of Assistant Professors = 65627.93731861202 Average Salary of Associate Professors = 84628.73472779371 Average Salary of Full Professors = 103540.03473053894 kashyap@kashyap-Inspiron-3542:-/Pictures/cch$