Java String handling

ADescription.md

A Java exercise taken from Exercism.io

I did not create this assignment. The coded solution is mine. This was a Java practice project which helped me with String manipulation methods.

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Bob is a lackadaisical teenager. In conversation, his responses are very limited.

Bob answers 'Sure.' if you ask him a question.

He answers 'Whoa, chill out!' if you yell at him.

He answers 'Calm down, I know what I'm doing!' if you yell a question at him.

He says 'Fine. Be that way!' if you address him without actually saying anything.

He answers 'Whatever.' to anything else.

bob.hey("         hmmmmmmm...") -> "Whatever."
bob.hey("Tom-ay-to, tom-aaaah-to.") -> "Whatever."
bob.hey("\t\t\t\t\t\t\t\t\t\t") -> "Fine. Be that way!"
bob.hey("") -> "Fine. Be that way!"
bob.hey("ZOMG THE %^*@#$(*^ ZOMBIES ARE COMING!!11!!1!") -> "Whoa, chill out!"
bob.hey("FCECDFCAAB") -> "Whoa, chill out!"
bob.hey("fffbbcbeab?") -> "Sure."
bob.hey("You are, what, like 15?") -> "Sure."
bob.hey("WHAT WERE YOU THINKING?") -> "Calm down, I know what I'm doing!"

Bob.java

class Bob {

	public String hey(String address) {
		String response = null;
      	if(this.hasLetters(address) && !this.hasLowerCase(address) && this.isQuestion(address))
		{
			response = "Calm down, I know what I'm doing!";	
		}
		//shouting = has letters which are all upper case
		else if(this.hasLetters(address) && !this.hasLowerCase(address))
		{
			response = "Whoa, chill out!";	
		}
		//question - ends with the question mark
		else if(this.isQuestion(address))
		{
			response = "Sure.";
		}
		//nothing but whitespace characters
		else if(this.isSilence(address))
		{
			response = "Fine. Be that way!";	
		}
		//all other possibilities
		else
		{
			response = "Whatever.";
		}
		
		return response;
	}
	
	private boolean isSilence(String address)
	{
		boolean isSilence = true;
		if (address.length() > 0)
		{	
			for(int i = 0;i<address.length();i++)
			{
				//get the character
				char a = address.charAt(i);
				//if not a space break the loop
				if(!Character.isWhitespace(a))
				{
					isSilence = false;
					break;
				}
			}
		}
		return isSilence;
	}
	
	private boolean isQuestion(String address)
	{
		boolean isQuestion = false;
		if(address.length() > 0)
		{	
			int theLength = address.length();
			//get the last character in the address
			String theEnd = address.substring(theLength-1);
			if(theEnd.equals("?"))
			{
				isQuestion = true;	
			}
		}
		return isQuestion;
	}
	
	private boolean hasLetters(String address)
	{
		boolean hasLetters = false;
	
		for(int i = 0;i<address.length();i++)
		{
			//get the character
			char a = address.charAt(i);
			//if it has letters break the loop
			if(Character.isLetter(a))
			{
				hasLetters = true;
				break;
			}
		}	
		return hasLetters;
	}
	
	private boolean hasLowerCase(String address)
	{
		boolean hasLower = false;
		for(int i = 0;i<address.length();i++)
		{
			//get the character
			char a = address.charAt(i);
			//if it has lower case letters break the loop
			if(Character.isLowerCase(a))
			{
				hasLower = true;
				break;
			}
		}
		return hasLower;
	}

  
  public static void main(String[] args) {
    
    Bob bob = new Bob();
    System.out.println(bob.hey("         hmmmmmmm..."));
    System.out.println(bob.hey("hi"));
    System.out.println(bob.hey(""));
    System.out.println(bob.hey("\t\t\t\t\t\t\t\t\t\t"));
    System.out.println(bob.hey("ZOMG THE %^*@#$(*^ ZOMBIES ARE COMING!!11!!1!"));
    System.out.println(bob.hey("WHAT WERE YOU THINKING?"));
  }
}