Keyboard.java

package exercise;

import java.util.ArrayList;
import java.util.Scanner;

import javafx.util.Pair;

/*
 * this class simulates the use of keyboard with a tv controller, the aim is count the steps needed to digit a word
 * each letter is followed by a OK button press that has to be included in the count, it's necessary to take the shorter route
 * from one letter to another, the prompt always starts on the letter A (0,0)
 * */

public class Keyboard {

	private static final String[][] keyboard ={//new String[5][8]
			{"a","b","c","d","e","1","2","3"},
			{"f","g","h","i","j","4","5","6"},
			{"k","l","m","n","o","7","8","9"},
			{"p","q","r","s","t",".","@","0"},
			{"u","v","w","x","y","z","_","/"}
	};

	public static int stepCounter(ArrayList<Pair<Integer,Integer>> pair) {
		int counter=0;

		for(int i=0; i<pair.size()-1;i++) {
			Pair<Integer,Integer> p = pair.get(i);
			Pair<Integer,Integer> p2 = pair.get(i+1);
			int step1= Math.abs(p.getKey()-p2.getKey());
			int step2= Math.abs(p.getValue()-p2.getValue());
			counter=counter+(step1+step2);
			counter++;//simulates OK button
			//System.out.println("*****************************"+ counter);
		}

		return counter;
	}

	public static Pair<Integer,Integer> findLetter(String letter) {

		Pair<Integer,Integer> resPair = new Pair<> (0,0);

		for(int i = 0; i<keyboard.length;i++) {
			for (int j=0; j<keyboard[i].length; j++) {
				if(keyboard[i][j].equalsIgnoreCase(letter)) {
					resPair=new Pair<>(i,j);
				}
			}
		}
		return resPair;
	}

	public static void main(String args[]) {
		
		Scanner sc = new Scanner(System.in);
		String input1=sc.next();
		String letter="";
		
		ArrayList<Pair<Integer,Integer>> arr= new ArrayList<>();
		Pair<Integer,Integer> pairs= new Pair<>(0,0);
		
		for(int i=0; i<input1.length();i++) {
			letter=Character.toString(input1.charAt(i));
			pairs= findLetter(letter);
			arr.add(pairs);
		}

		System.out.println("total steps:"+stepCounter(arr));
		sc.close();
	}

}