Question

ArraysAndFiles.java and PartiallyFilledArray.java. They are shells that do not do anything. You will be adding code after the comments in the main method and using the javadoc documentation to implement the other methods.

Task 1: Send array data to the screen

In ArraysAndFiles.java, create a new method printOnScreen and compile it.

In the main method of ArraysAndFiles.java, add the code to declare and initialize the array of Strings and call printOnScreen to print the array on the screen.

Task 2: Send array data to a textfile

In the main method of ArraysAndFiles.java

Add code to open a textfile named "Output.txt"

Write the array contents to the textfile using an "enhanced for" loop.

Task 3: Read data from a file into a completely-filled array

Create an input file: Using a text editor, create an input file called “Input.txt” with these subjects. Put one per line:

Computer Science

Mathematics

Biology

English

Physical Education

Read array data from a textfile into a completely-filled array

In the main method of ArraysAndFiles.java, open the input textfile named “Input.txt”.

Create an array of Strings. The size of the array must be the same as the number of Strings in the file.

Read new data from the textfile into the array.

Task 4: Work with a partially-filled array

In PartiallyFilledArray.java, create a new method printPartiallyFilledArray and compile it.

In the main method of PartiallyFilledArray.java

Instantiate a String array that can contain 10 strings.

Write a sentinel-controlled (“q” to quit) loop to read some strings into an array from the keyboard and count how many have been read in. Possibly, they will only partially fill it up.

Call the printPartiallyFilledArray method to print the array elements that were read in.

Your program will be graded according your adherence to the following specifications:

Program compiles and runs without errors.

Appropriate data types and descriptive names are chosen for all variables and constants.

The program is properly indented.

Submit ArraysAndFiles.java and PartiallyFilledArray.java for grading to the blackboard.

(Sample output of ArraysAndFiles.java)

First Shell

/**
 * ArraysAndFiles contains codes to read array items
 * from files and send array items to files.  
 *
 */
import java.io.*;

public class ArraysAndFiles
{
     public static void main(String[] args) throws IOException
    {
        // Declare and initialize an array of Strings.  This one
        // will contain "A", "B", "C", "D", "E", "F", "G"
        
        
        // Print the array contents on the screen
        
        
        // Open a textfile "Output.txt" 
        
                
        // Write the array contents to the textfile using an "enhanced for" loop.
         

        
        // Open an input textfile named "Input.txt".
        

        // Read new data into the array of names from "Input.txt" one String per line, and places them in an array. 
        //The number of Strings in the file must be the same as the number of cells in the array.
                
                
       
       
       // Print the new array contents on the screen
        
        
        
    }

    /**
     * Method printOnScreen sends the entire contents of an 
     * array to the Screen using an "enhanced for" loop.
     * 
     * param array the array of Strings be printed on Screen
     * 
     */
    
   
    
}
/**

Second Shell

/**
 * Class PartiallyFilledArray  reads items for a 
 * partially-filled array from the keyboard, and
 * then prints them on the screen.  
 */
public class PartiallyFilledArray
{

    public static void main(String [] args)
    {
        // Instantiate a String array that can contain 10 items.
        
       
        // Read names of subjects into this array
        // and count how many have been read in.
        // There may be fewer than 10.
        



        // Call printPartiallyFilledArray to print the names in the array.
       
    }


        /**
         * Method printPartiallyFilledArray prints the String values 
         * in a partially-filled array, one per line.  Only the 
         * significant items in the array should be printed.
         * 
         * param array the array of Strings to be printed on the screen
         * param count the number of items in the partially-filled array
         */
}