Question

Step 1: Getting Started

Create a new .java file named Lab12.java. At the beginning of this file, include your assignment documentation code block. After the documentation block, you will need several import statements.

import java.util.Scanner;

import java.io.BufferedReader;
import java.io.FileNotFoundException;

import java.io.FileReader;
import java.io.IOException;

Next, declare the Lab12 class and define the main function.

public class Lab12 {
    public static void main (String [] args) {

Step 2: Declaring Variables

For this section of the lab, you will need to declare 1 local variable: a String that we will use to store the data read from a file. Declare this variable inside of the main function.

// A String for the strings that we will read from file.
// -->

Step 3: Declare the Array

Make an 2D array with 12 elements (4 rows and 3 columns) This declaration is very similar to the way we have declared Scanner, Person, Student, and Employee objects in the past. Make sure to declare a Stringarray.

// For reference, the following is an EXAMPLE declaration of an
// String [] [] Array1 = new String [4][3];
// -->

Step 4: Create a text file

Make a text file and write 12 strings in it, one string on each line, and then save it in the folder that you want to save your program in it. The text file and your java program must be in the same folder.

Step 5: read from the file

In this step you must open the file that you made in the step 4 and read the file.

// put all the commands of this step in a try block
try {
    // Make a fileReader object to open the file that you want
    // You the name of the file that you made in step 6
    FileReader fr = new FileReader (name of the file);
    // define a BufferedReader named inFile to read from the file
    // -->
    // use a nested for loop structure to read all lines of file
    for (int row = 0; row < 4; row++) {
        for (int col = 0; col < 3; col++) {
            // read one line of file at a time
            // store the line in a string variable using something like this:
            line = inFile.readLine();
            // store this line in the array
            Array1[row][col] = line;
        }
        //close the file
        inFile.close();
    }
} catch (FileNotFoundException ex) {
    System.out.println("No file with that name found!");
} catch (IOException ex) {
 System.out.println("An error occurred while trying to read the file!");
}

Step6: Print the array contents

for (int row = 0;row < 4; row++) {
    for (int col = 0; col < 3; col++) {
        System.out.print(Array1[row][col] + ” “);
    }
    System.out.println ();
}

Sample input: A text file with 12 lines like this

Apple
Banana
Cherry
Durian
Elderberry
Fig
Grape
Huckleberry
Jackfruit
Kumquat
Lime
Mango

Sample output.

Apple Banana Cherry
Durian Elderberry Fig
Grape Huckleberry Jackfruit
Kumquat Lime Mango

Answer 1

Dear Student ,

As per the requirement submitted above , kindly find the below solution.

Here a new java program with name "Lab12.java" is created, which contains following code.

Lab12.java :

import java.util.Scanner;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
public class Lab12 {

   public static void main(String[] args) {
       // A String for the strings that we will read from file.
       String line;
       String [] [] Array1 = new String [4][3];
       // put all the commands of this step in a try block
       try {
       // Make a fileReader object to open the file that you want
       // You the name of the file that you made in step 6
       FileReader fr = new FileReader("fruits.txt");
       // define a BufferedReader named inFile to read from the file
       BufferedReader inFile=new BufferedReader(fr);
       // use a nested for loop structure to read all lines of file
       for (int row = 0; row < 4; row++) {
       for (int col = 0; col < 3; col++) {
       // read one line of file at a time
       // store the line in a string variable using something like this:
           line = inFile.readLine();
       // store this line in the array
       Array1[row][col] = line;
         
       }
         
       }
       //close the file
   inFile.close();
       } catch (FileNotFoundException ex) {
       System.out.println("No file with that name found!");
       } catch (IOException ex) {
       System.out.println("An error occurred while trying to read the file!");
       }
       for (int row = 0;row < 4; row++) {
       for (int col = 0; col < 3; col++) {
       System.out.print(Array1[row][col] + " ");
       }
       System.out.println ();
       }

   }

}

======================================================

Output : Compile and Run above program to get the screen as shown below

Screen 1 :fruits.txt

Screen 2:Lab12.java

NOTE : PLEASE FEEL FREE TO PROVIDE FEEDBACK ABOUT THE SOLUTION.