Question

Write a program that concatenates the characters in a two-dimensional into a set of Strings in a
one-dimensional array as described below.
main
#Request and Read in the number of rows of a two dimensional array.
#Create the reference to the two-dimensional array.
For each row
#Request and Reads in a line of text
#Based on the length of the line create a row with the correct number of columns (look
#back to lesson 3)
#Place each character for the String into the row, one character at a time.
#Call concatenateColumnsPerRow with a reference to the character two-dimensional array as a
#reference. The return will be a reference to a one-dimensional String array.
#Call displayArray with a reference to the one-dimensional StringArray.
concatenateColumnsPerRow
#Accepts a character two-dimensional array reference as input.
#Concatenates the elements in each row into a String.
#Returns a one-dimensional String array, with the Strings from each row placed into the
#corresponding row in the String array.
displayArray
#Accepts the one-dimensional String array and prints out the Strings on separate lines

Answer 1

import java.util.Scanner; public class MultiDimensionalArrayConcater { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); //Request and Read in the number of rows of a two dimensional array. System.out.printf("Enter number of rows: "); int rows = scanner.nextInt(); //Create the reference to the two-dimensional array char[][] arr = new char[rows][]; for (int i = 0; i < rows; i++) { //Request and Reads in a line of text System.out.printf("Enter line: "); String word = scanner.next(); //Based on the length of the line create a row with the correct number of columns arr[i] = new char[word.length()]; for (int j = 0; j < word.length(); j++) { //Place each character for the String into the row, one character at a time arr[i][j] = word.charAt(j); } } //Call concatenateColumnsPerRow with a reference to the character two-dimensional array as a //reference. String[] result = concatenateColumnsPerRow(arr); //Call displayArray with a reference to the one-dimensional StringArray displayArray(result); } //Accepts a character two-dimensional array reference as input.Concatenates the elements in each row into a String //Returns a one-dimensional String array, with the Strings from each row placed into the corresponding row in the String array public static String[] concatenateColumnsPerRow(char[][] arr) { String[] result = new String[arr.length]; for (int i = 0; i < arr.length; i++) { String word = ""; //Creating word of a row for (int j = 0; j < arr[i].length; j++) { word += (arr[i][j]); } //adding to result result[i] = word; } return result; } //Accepts the one-dimensional String array and prints out the Strings on separate lines public static void displayArray(String[] arr) { System.out.println(); for (int i = 0; i < arr.length; i++) { System.out.println(arr[i]); } } }