Java important program

How to get list of all file names from a folder in java

package com.java2novice.files;

import java.io.File;

public class FileListFromFolder

{  

    public static void main(String a[])

    {

        File file = new File("C:/MyFolder/");

        String[] fileList = file.list();

        for(String name:fileList)

        {

            System.out.println(name);

        }

    }

}

Reverse a word or string using Stack data structure

package com.java2novice.ds.stack;

public class MyWordReverse

{

           public String reverseWord(String word)

      { 

        StringBuilder sb = new StringBuilder();

        int size = word.length();

        StackImpl stack = new StackImpl(size);

        for(int i=0;i

        {

            stack.push(word.charAt(i));

        }

        while(!stack.isStackEmpty())

         {

            sb.append(stack.pop());

        }

        return sb.toString();

    }

     public static void main(String a[])

    {

        MyWordReverse mwr = new MyWordReverse();

        System.out.println("Java2Novice == "+mwr.reverseWord("Java2Novice"));

        System.out.println("Java == "+mwr.reverseWord("Java"));

        System.out.println("program == "+mwr.reverseWord("program"));

    }

}

class StackImpl

  {

    private int stackSize;

    private char[] stackArr;

    private int top;

    public StackImpl(int size)

   {

        this.stackSize = size;

        this.stackArr = new char[stackSize];

        this.top = -1;

    }

               public void push(char entry)

              {

        this.stackArr[++top] = entry;

    }

    public char pop()

     {

        char entry = this.stackArr[top--];

        return entry;

    } 

    public char peek()

    {

        return stackArr[top];

    }

    public boolean isStackEmpty()

    {

        return (top == -1);

    }  

    public boolean isStackFull()

    {

        return (top == stackSize - 1);

    }

}