Count words and sort the words in line

Programs:
public class Count {
    public static void main(String arg[]){
        String main = "hello welcome to java";
        char[] arr = main.toCharArray();

Get the input string from User using scanner object and reverse the string using for loop

Program: 
import java.util.Scanner;
public class HelloWorld{
     public static void main(String []args){
        System.out.println("Hello World");
        // Getting a string from user using Scanner

Write Data in existing sheet at the end of the sheet

Program:

import java.io.File;  

import java.io.FileInputStream;  

import java.io.FileNotFoundException;  

import java.io.FileOutputStream;

Write Data in existing excel doc in new sheet

Program:

import java.io.File;

import java.io.IOException;

import java.util.Locale;

import jxl.CellView;

import jxl.Workbook;

import jxl.WorkbookSettings;

import jxl.format.UnderlineStyle;

Code to save command prompt data to text file

Program:

import java.io.BufferedWriter;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileWriter;