Cracking the Coding Chpt 1.6 String Compression

StringCompression.java

// aabccccaaa -> aabccccaaa
String compressString(String input) {
	StringBuilder compressed = new StringBuilder(); 
	int count = 1; 
	String[] arr = input.split(""); 
	for(int i = 0; i < arr.length; i++) {
		++count; 
		if(i + 1 >= arr.length || !arr[i + 1].equals(arr[i])) {
			compressed.append(arr[i]); 
			compressed.append(Integer.toString(count));
			count = 0; 
		} 
	}

	return compressed.toString().length() < input.length() ? compressed.toString() : input; 
}

"Look ahead" and safety index check are better done in if statement instead of messing with the loop beginning or end conditions.