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){
		char[] code = word.toLowercase().toCharArray();
		for (int i=1; i<code.length; i++){
			switch(code[i]){
				case 'a':
				case 'b':
				case 'c':
					code[i] = '1';
					break;
				...
				default:
					code[i] = ' ';
					break;
			}
		return new String(code);
	}