add a file into my classpath

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Java

import java.io.*;
import java.util.Properties;

public class Input
{
    // This code is nasty and not exception safe. Just demo code!
    public static void main(String[] args) throws Exception
    {    
    InputStream  stream = Input.class.getResourceAsStream("SomeTextFile.txt");
     InputStreamReader is=new InputStreamReader(stream);
     BufferedReader br =new BufferedReader(is);
     String str=null;
     while ((str = br.readLine()) != null) {
    	   System.out.println(str);
    	  }
		
               
    }
}

Hi,this is my class and my file name is "SomeTextFile.txt" which is located in C:\MyProgram,and the Input.class file is located in D:\myjava ,I want to run this program in commandprompt,like

D:\myjava>javac Input.java -then it will compile

D:\myjava>java Input -then it will showing error
also i give java -classpath C:\MyProgram Input and run also same error.
I am new in java ,please someone help me what i have to give in commandprompt?