Question #57455
Morse designed a coding system in which letters and other symbols are represented as coded sequences of short and long tones, traditionally called dots and dashes. The codes of the alphabet is easily found by searching "Morse Code". You can easily store these codes in a program by declaring an array with 26 elements and storing the sequence of characters corresponding to each letter in the appropriate array entry. Write a program that reads a string from the user and translates each letter in the string to its equivalent Morse code, using periods to represent dots and hyphens for dashes. Separate words in the output by calling println when there is a space in the input, but ignore punctuation. Write a Console Program in Java in which you can be using the acm.* libraries of Java.
Expert's answer
```
Run.java
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package morsecode;
import java.util.Scanner;
/**
* @author Slunger
*/
public class Run {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
// TODO code application logic here
Scanner i = new Scanner(System.in);
System.out.println("Enter the string:");
String[] str = MorseCode.getCode(i.nextLine());
for (String s : str)
System.out.println(s);
}
}MorseCode.java
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package morsecode;
/**
* @author Slunger
*/
public class MorseCode {
private static final String[] LETTERS = new String[] {
".-", "-...", "-.-.", "-..", ".", "..-.", "--.",
"....", "..", ".---", "-.-", ".-..", "--",
"-.", "---", ".--.", "--.-", ".-.",
"...", "-", "..-", "...-", ".--",
"-..-", "-.--", "--.."
};
private static final String[] DIGIT = new String[] {
"-----", ".----", "..---", "...--", "....-", ".....",
"-....", "--...", "---..", "----."
};
public static String[] getCode(String string) {
string = string.trim();
int n = 1, lastIndex;
int index = string.indexOf(" ");
while (index > 0) {
if (string.charAt(index + 1) != ' ')
n++;
index = string.indexOf(" ", index + 1);
}
String[] result = new String[n];
int i = 0;
while (i < n) {
lastIndex = string.indexOf(" ");
if (lastIndex == -1) {
result[i++] = string.substring(0, string.length());
} else {
result[i++] = string.substring(0, lastIndex);
string = string.substring(lastIndex, string.length());
string = string.trim();
}
}
for (i = 0; i < n; i++)
result[i] = getCodeString(result[i]);
return result;
}
private static String getCodeString(String string) {
StringBuilder line = new StringBuilder();
for (int i = 0; i < string.length(); i++) {
line.append(charToCode(string.substring(i, i + 1).toUpperCase().charAt(0)));
line.append(" "); // Add space between characters
}
return line.toString();
}
private static String charToCode(char c) {
int i = -1, j = -1;
switch (c) {
case 'A':
i = 0;
break;
case 'B':
i = 1;
break;
case 'C':
i = 2;
break;
case 'D':
i = 3;
break;
case 'E':
i = 4;
break;
case 'F':
i = 5;
break;
case 'G':
i = 6;
break;
case 'H':
i = 7;
break;
case 'I':
i = 8;
break;
case 'J':
i = 9;
break;
case 'K':
i = 10;
break;
case 'L':
i = 11;
break;
case 'M':
i = 12;
break;
case 'N':
i = 13;
break;
case 'O':
i = 14;
break;
case 'P':
i = 15;
break;
case 'Q':
i = 16;
break;
case 'R':
i = 17;
break;
case 'S':
i = 18;
break;
case 'T':
i = 19;
break;
case 'U':
i = 20;
break;
case 'V':
i = 21;
break;
case 'W':
i = 22;
break;
case 'X':
i = 23;
break;
case 'Y':
i = 24;
break;
case 'Z':
i = 25;
break;
case '0':
j = 0;
break;
case '1':
j = 1;
break;
case '2':
j = 2;
break;
case '3':
j = 3;
break;
case '4':
j = 4;
break;
case '5':
j = 5;
break;
case '6':
j = 6;
break;
case '7':
j = 7;
break;
case '8':
j = 8;
break;
case '9':
j = 9;
break;
default:
i = -1;
j = -1;
break;
}
if (i > -1)
return LETTERS[i];
else if (j > -1)
return DIGIT[j];
else
return "";
}
}
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