Here is an example that reverse the words in a sentence.

public class ReverseWordsUsingLoops{

    public char[] reverseWords(char[] ch){
        int i;
        int index = 0; 
        for(i=0;i<=ch.length;i++){
            if(i==ch.length){
                reverse(ch,index,i-1);
            }
            else if(ch[i]==' '){
                reverse(ch,index,i-1);
                index = i+1;
            }
        }
        reverse(ch,0,i-2);
        return ch;
    }
    public char[] reverse(char[] ch,int start, int end){
        char temp;
        while(start<end){
        temp = ch[start];
        ch[start++]=ch[end];
        ch[end--]=temp;
        }
        return ch;
    }
    public static void main(String args[]){
        ReverseWordsUsingLoops rw = new ReverseWordsUsingLoops();
        String s = "Conputer Software";
        char[] ch = s.toCharArray();
        System.out.println(rw.reverseWords(ch));
    }
}