Java words reverse

Question

I am new to Java and I found a interesting problem which I wanted to solve. I am trying to code a program that reverses the position of each word of a string. For example, the input string = "HERE AM I", the output string will be "I AM HERE". I have got into it, but it's not working out for me. Could anyone kindly point out the error, and how to fix it, because I am really curious to know what's going wrong. Thanks!

import java.util.Scanner;
public class Count{
static Scanner sc = new Scanner(System.in);
static String in = ""; static String ar[];
void accept(){
    System.out.println("Enter the string: ");
    in = sc.nextLine();
}
void intArray(int words){
    ar = new String[words];
}
static int Words(String in){
    in = in.trim(); //Rm space
    int wc = 1;
    char c;
    for (int i = 0; i<in.length()-1;i++){

        if (in.charAt(i)==' '&&in.charAt(i+1)!=' ') wc++;
    }
    return wc;
}
void generate(){
    char c; String w = ""; int n = 0;
    for (int i = 0; i<in.length(); i++){
        c = in.charAt(i);
        if (c!=' '){
          w += c;
        }
        else {
            ar[n] = w; n++;
        }

    }
}
void printOut(){
    String finale = "";
    for (int i = ar.length-1; i>=0;i--){
        finale = finale + (ar[i]);
    }
    System.out.println("Reversed words: "  + finale);
}
public static void main(String[] args){
    Count a = new Count();
    a.accept();
    int words = Words(in);
    a.intArray(words);
    a.generate();
    a.printOut();
 }
}

Answer 1

From adding debug output between each method call it's easy to determine that you're successfully reading the input, counting the words, and initializing the array. That means that the problem is in generate().

Problem 1 in generate() (why "HERE" is duplicated in the output): after you add w to your array (when the word is complete) you don't reset w to "", meaning every word has the previous word(s) prepended to it. This is easily seen by adding debug output (or using a debugger) to print the state of ar and w each iteration of the loop.

Problem 2 in generate() (why "I" isn't in the output): there isn't a trailing space in the string, so the condition that adds a word to the array is never met for the last word before the loop terminates at the end of the string. The easy fix is to just add ar[n] = w; after the end of the loop to cover the last word.