Reverse Word

Reverse

public static String reverseWord(String str){
        char[] array = str.toCharArray();
        int start=0;
        int end=array.length-1;
        reverse(array,0,array.length-1);
        while (start<=end && array[start]==' ')
            start++;

        while (end>=start && array[end] == ' ')
            end--;

        for(int j=start;j<=end;j++){
            if(array[j]==' '){
                reverse(array,start,j-1);
                j++;
                while (array[j]==' ')
                    j++;
                start=j;
            }
        }
        reverse(array,start,end);
        return String.valueOf(array);
    }




public static void reverse(char[] array, int start, int end){
        while (start<end){
            char temp = array[start];
            array[start]=array[end];
            array[end]=temp;
            start++;
            end--;
        }
 }