1a.java

	/**
	 * @param word String to be turned into T9 code
	 * @return the T9 code of the input string
	 * 
	 * Method returns the order of buttons of digipad buttons to be pressed to 
	 * get the input String from a T9 predictive text dictionary.
	 * 
	 * This method assumes the order of the buttons is as follows and ignores case:
	 *
	 * 2= a,b,c
	 * 3= d,e,f
	 * 4= g,h,i
	 * 5= j,k,l
	 * 6= m,n,o
	 * 7= p,q,r,s
	 * 8= t,u,v
	 * 9= w,x,y,z
	 * 
	 * punctuation of any kind is replaced with a " ".
	 * 
	 */
	
	public static String wordToSignature(String word){
		String code = "";
		while(!(word=="")){ //while the word isn't empty
			String l = word.substring(0, 1); //first letter of the word
			if(l.equalsIgnoreCase("a")||l.equalsIgnoreCase("b")||l.equalsIgnoreCase("c")){
				code +="2";
			}else if(l.equalsIgnoreCase("d")||l.equalsIgnoreCase("e")||l.equalsIgnoreCase("f")){
				code +="3";
			}else if(l.equalsIgnoreCase("g")||l.equalsIgnoreCase("h")||l.equalsIgnoreCase("i")){
				code +="4";
			}else if(l.equalsIgnoreCase("j")||l.equalsIgnoreCase("k")||l.equalsIgnoreCase("l")){
				code +="5";
			}else if(l.equalsIgnoreCase("m")||l.equalsIgnoreCase("n")||l.equalsIgnoreCase("o")){
				code +="6";
			}else if(l.equalsIgnoreCase("p")||l.equalsIgnoreCase("q")||l.equalsIgnoreCase("r")||l.equalsIgnoreCase("s")){
				code +="7";
			}else if(l.equalsIgnoreCase("t")||l.equalsIgnoreCase("u")||l.equalsIgnoreCase("v")){
				code +="8";
			}else if(l.equalsIgnoreCase("w")||l.equalsIgnoreCase("x")||l.equalsIgnoreCase("y")||l.equalsIgnoreCase("z")){
				code +="9";
			}else{
				code +=" ";
			}
			if(word.length()>1){
				word=word.substring(1,word.length()); //returns the word minus its first letter
			}else{
				break; // prevent outofbounds exception
			}
		}
		return code;
	}