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AssessmentPartFour.java

+import java.util.ArrayList;
+import java.io.FileNotFoundException;
+import java.util.List;
+import java.io.File;
+import java.util.Scanner;
+
+
+public class AssessmentPartFour {
+	
+	List<String> morseCode = new ArrayList<String>();
+	
+	public int loadMorseFromFile(String filename) //throws IOException
+	{
+		
+		//this deletes all data from the array list effectively making it a blank slate.
+	    morseCode.clear();
+		
+		
+		//this sets up a variable to represent the text file
+	    File morse = new File(filename);
+	    
+	    //this creates an instance of a scanner so that the file can be read from.
+	    Scanner readLine;
+	    
+	    //This creates a try catch method that prevents the program from breaking if the file cannot be found.
+		try {
+			//this creates a new instance of the scanner that allows it to read from the file
+			readLine = new Scanner(morse);			
+			//this creates a while loop that will continue to iterate until there is no longer anything to read from the file
+			 while (readLine.hasNextLine()) {
+				 //this adds the line that the program has just read into the array list
+				 morseCode.add(readLine.nextLine());
+				
+			      
+			  }
+		//This section of code runs if the file cannot be found and causes an error
+		} catch (FileNotFoundException e) {
+			// TODO Auto-generated catch block
+			e.printStackTrace();
+		} 
+	  
+		//This returns the number of lines within the array list by calculating the size
+		return morseCode.size();
+		
+	}
+	
+	public String translateMorse()
+	{
+		//this creates an instance of a string builder called message
+		StringBuilder message = new StringBuilder();
+		//this is a for loop that will continuously loop until the array morseCode is empty
+		//this has also created a string that is equal to each string in the array morse
+		for (String sentence: morseCode)
+		{
+			//this creates a string called decoded and uses the method translator to translate the string sentence
+			String decoded = translator(sentence);
+			//this uses the stringbuilder to add the decoded string to the message
+			message.append(decoded);
+		}//this returns the fully decoded message
+		return message.toString();
+	}
+	//this is an additional method that I created that translates the morse for me
+	public String translator(String morseSentence)
+	{
+		//this is an array that contains the english alphabet including a space
+		String[] englishAlphabet = {"a", "b", "c", "d", "e", "f", "g", "h", "i","j", "k", "l", "m", "n", "o", "p", "q",
+			"r", "s", "t", "u","v", "w", "x", "y", "z", " "	};
+			//this is an array that contains the morse alphabet
+		String[] morseAlphabet = {".-", "-...", "-.-.", "-..", ".", "..-.", "--.", "....", "..",".---", "-.-", ".-..",
+				"--", "-.", "---", ".--.", "--.-",  ".-.", "...", "-", "..-","...-" ,".--" ,"-..-", "-.--", "--..", "/"};
+		
+		//this is a for loop that continues to loop until it reaches the end of the array morseAlphabet
+		for(int i = 0; i < morseAlphabet.length; ++i){
+			//this checks whether the word in the array is equal to the letter in the morse alphabet
+			if(morseSentence.equals(morseAlphabet[i]))
+			{
+				//if they are equal then this returns the translated word to the method translateMorse
+				return englishAlphabet[i];
+			}
+			
+		}
+		//nothing is returned if the program is unable to decipher what is in the file.
+		return null;
+		}
+	
+	
+	
+
+}

AssessmentPartFourTest.java

+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+
+class AssessmentPartFourTest {
+
+	
+	public static AssessmentPartFour test;
+	
+	
+	@BeforeAll
+	static void setUpBeforeClass() throws Exception {
+		test = new AssessmentPartFour();
+	}
+
+	@ParameterizedTest
+	@DisplayName("Testing loadMorseFromFile")
+	@CsvSource({
+					"test1.txt,9",
+					"test2.txt,18",
+					"test3.txt,15",
+					"test4.txt,13"
+	})	
+	void testEnryptedCharacter(String filename, int count) {
+		assertEquals(count,test.loadMorseFromFile(filename));
+	}
+
+	@ParameterizedTest
+	@DisplayName("Testing translateMorse")
+	@CsvSource({
+					"test1.txt,9,java code",
+					"test2.txt,18,programming is fun",
+					"test3.txt,15,fingers crossed",
+					"test4.txt,13,yippee did it"
+	})
+	void testEncryptedString(String filename, int count, String message) {
+		int cc = test.loadMorseFromFile(filename);
+		if (cc==count)
+		{
+			assertEquals(message, test.translateMorse());
+		}
+		else
+		{
+			fail("File failed to load");
+		}
+	}
+}