reverse a string, then reverse a sentence

Question

Califax · Accepted Answer

1) reverse a string:

public static String reverse(String str) {
		StringBuilder revStr = new StringBuilder("");
		for (int i = str.length()-1; i >= 0; i--) {
			revStr.append(str.charAt(i));
		}
		return revStr.toString();
	}


2) Reverse a sentence: 

	public static String reverseSentance(String str) {
		StringBuilder revStr = new StringBuilder("");
		String[] arr = str.split(" ");
		for (int i = arr.length-1; i >= 0; i--) {
			revStr.append(arr[i] + " ");
		}
	    return revStr.toString();
    }

ektor · Answer

1. swap position 1 - n, 2 - (n-1), ... 
2. previous step and called again for every word every time a word delimiter is found.

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