main function not being called?

[LdaXy]

i was writing some code for a small project i'm working on and form somke reason, it never displays the main function. it just makes the user input 7 times before crashing. any ideas? i can't seem to locate my error.

package rtnasm;

/*
 * RTNASM - n64 assembler
 * 
 * problems - for some reason it's asking for input on start instead of using the main method.
 * idk how to fix it.
 */

import java.util.Scanner;

import java.util.Stack;
import java.io.DataInputStream;


public class rtnasm {
	
	public static constants c = new constants();
	
	public static void main(String [] args)
	{
		System.out.println("Real Time Nintendo 64 Assmebler by Alexander Frankland");
		System.out.println("Version 0.44 Rev B");
		System.out.println("\nChangelog");
		System.out.println("------------");
		System.out.println("Added new function to allow users to overwrite single existing lines");
		System.out.println("to view a full list of functions type help");
		Menu();
	}
	
	public static void Menu()
	{
		System.out.println("\nRTNASM::");
		System.out.print(c.options.toLowerCase());
		
		if(c.options.indexOf("help") > 0)
			HelpMsg();
		else if(c.options.indexOf("newfile") > 0)
			SetFileName();
		else if(c.options.indexOf("viewcode") > 0)
			ReturnStack();
		else if(c.options.indexOf("exit") > 0)
			EndProgram();
		else if(c.options.indexOf("editline") > 0)
			EditLine();
		else
			System.out.println("Not a valid function!");
	}
	public static void SetFileName()
	{
		System.out.println("Enter the file name below (you'll hvae to program this name into the header of the rom!)");
		System.out.println("File name: ");
		System.out.print(c.FileName);
		SetMemoryBuffer();
	}
	
	public static void SetMemoryBuffer()
	{
		System.out.println("Enter the value for the size of the rom(0 for 4mb. Hint: Size < 81920000!)");
		System.out.println("Rom Size: ");
		System.out.print(c.MaxOpcodesGet);
		
		if(c.MaxOpcodesGet == 0 || c.MaxOpcodesGet > 81920000)
			c.MaxOpcodesGet = 40960000;
		OpcodeEntry();
	}
	
	public static void OpcodeEntry()
	{
		System.out.println("File: " + c.FileName);
		System.out.println("Approx. Size: " + c.ApproxSize + "MB(" + c.MaxOpcodes + ")");
		System.out.println("You may now begin to enter you code below! type endl to exit!");
		System.out.println("\n");
		
		for (c.i = 0; c.i < c.MaxOpcodes;)
		{
			System.out.println(Integer.toHexString(c.i).toUpperCase() + ": ");
			System.out.print(c.OpcodeGet.toUpperCase());
			
			if(c.OpcodeGet.indexOf("ENDL") > 0)
				Menu();
			else
			{
				c.Opcode[c.i] = c.OpcodeGet;
				c.OpcodeStack.add(c.i, c.Opcode[c.i]);
				c.i+=1;
				continue;
			}
			
		}
		
	}
	
	public static void ReturnStack()
	{
		System.out.println("Printing all of your inputed code to the screen!");
		
		for(c.x = 0; c.x < c.OpcodeStack.size();)
		{
			c.Output = c.OpcodeStack.get(c.x);
			System.out.println(Integer.toHexString(c.x).toUpperCase() + ": " + c.Output);
			c.x+=1;
		}
	}
	
	public static void HelpMsg()
	{
		System.out.println("\nList of functions");
		System.out.println("-------------------");
		System.out.println("newfile - creates a new romfile");
		System.out.println("viewcode - displays all entered code");
		System.out.println("editline - edits a specific line you entered");
		System.out.println("writeall - writes code to .z64 file of specified name (COMMING SOON!)");
		System.out.println("options -  sets options (COMMING SOON)");
		System.out.println("exit - ends the program");
		System.out.println("help - displays this help screen");
	}
	
	public static void EditLine()
	{
		System.out.println("Enter the line you want to edit: ");
		System.out.print(c.LineNumGet);
		System.out.println("Enter the new code for the specified line: ");
		System.out.print(c.OpcodeGet);
		
		c.Opcode[c.LineNum] = c.OpcodeGet;
		c.OpcodeStack.remove(c.LineNum);
		c.OpcodeStack.add(c.LineNum, c.Opcode[c.LineNum]);
	}
	


	public static void EndProgram()
	{
		System.exit(0);
	}
}

class constants
{
	public DataInputStream di;
	public Stack<String> OpcodeStack = new Stack<String>();
	public int x,i,t;
	public int MaxOpcodesGet = new Scanner(System.in).nextInt();
	public int MaxOpcodes = MaxOpcodesGet;
	public String[] Opcode = new String[MaxOpcodes];
	public String FileNameGet = new Scanner(System.in).nextLine();
	public String FileName = FileNameGet + ".z64";
	public float ApproxSize = MaxOpcodes / 10240000;
	public String OpcodeGet = new Scanner(System.in).nextLine();
	public String Output;
	public String options = new Scanner(System.in).nextLine();
	public int LineNumGet = new Scanner(System.in).nextInt();
	public int LineNum = LineNumGet;
}

[ejosiah]

your constants does not work the way u expect it to work. when u create an instance of your constants object it does not read any input. what you need to do is to ask the user for input from the main method after which u can call scanner.next(whatever)