Question

• open up a new Java project on Eclipse named Review and create a new class called Review.java.
• Copy and paste the below starter code into your file:

/**

* @author

* @author

* CIS 36B
*/

//write your two import statements here

public class Review {
  
    public static void main(String[] args) { //don't forget IOException
        File infile = new File("scores.txt");
        //declare scores array
        //Use a for or while loop to read in data from scores.txt to the array
        //call method
        //Use a for loop to write data from array into extraCredit.txt
      
    }
    
        
    /**
     * Write complete Javadoc comment here
     */
    //write your addExtraCredit method here   
  
}

• Next, create a new text file named scores.txt
  • Rick-click the project. Go to New->File.
  • Name your file scores.txt
  • Make sure the text file gets saved inside the overall project folder (Review), not in the src folder
• Now, copy and paste the following data (exam scores) into your scores.txt file:

90
95
86
41
79
56
90
83
74
98
56
81
64
99
12

• Your program must declare an array of integers, and populate the array with the contents of the file.
  • You may assume that the length of the array is known to be 15 elements.
• Next, write a method called addExtraCredit:
  • The addExtraCredit method takes in one parameter - an array of integers
  • It adds 2 to each element in the array (hint: think for loop)
  • It returns nothing
• Inside of main, call the addExtraCredit method, passing it the array of exam scores.
• Next, write the contents of the array to a file named extraCredit.txt.
  • Use PrintWriter to write out to the file (see lesson notes above).
• When you are finished, extraCredit.txt should contain the following:
  • Don't forget the title!

Scores with Extra Credit:
92
97
88
43
81
58
92
85
76
100
58
83
66
101
14

• Hint: Your program should include either 3 for loops or 2 for loops and a while loop.
• If you get stuck, review today's lesson notes.
• When extraCredit.txt contains the above data, submit your program to Canvas.
• Both partners must submit to receive credit.

Answer 1

If you have any doubts, please give me comment...

/**

* @author

* @author CIS 36B

*/

// write your two import statements here

import java.io.*;

import java.util.*;

public class Review {

    public static void main(String[] args) throws IOException{ // don't forget IOException

        File infile = new File("scores.txt");

        Scanner fileScnr =new Scanner(infile);

        // declare scores array

        int scores[] = new int[15];

        // Use a for or while loop to read in data from scores.txt to the array

        int n=0;

        while(fileScnr.hasNextInt()){

            scores[n] = fileScnr.nextInt();

            n++;

        }

        fileScnr.close();

        // call method

        addExtraCredit(scores);

        // Use a for loop to write data from array into extraCredit.txt

        PrintWriter pw = new PrintWriter(new File("extraCredit.txt"));

        for(int i=0; i<n; i++){

            pw.println(scores[i]);

        }

        pw.close();

    }

    /**

     * Write complete Javadoc comment here

     */

    // write your addExtraCredit method here

    public static void addExtraCredit(int scores[]){

        for(int i=0; i<scores.length; i++){

            scores[i] += 2;

        }

    }

}