Array index out of range: 1 HELP!

[TheBreadCat]

i cant find out what im doing wrong!

import java.util.LinkedList;
import java.util.List;
import java.util.Scanner;
import java.util.Stack;


public class Compiler 
{	
	static int j,i = 0;
	static String CI; //CommandInput
	static Scanner I = new Scanner(System.in); //demanded Input
	static Stack M = new Stack(); //memory
	static int Mindex = 0;
	static int[][] O; //output (8x8 screen)
	static String ScopeVar , ScopeOp;
	static int ScopeVal;
	public static void main(String[] args) {
		CI = I.next();
		M.push(0);
		while(i !=CI.length())
		{
			CheckOps(i);
			CheckArgs(i);
			CheckVals(i);
			i++;
		}
	}
	

	public static int CheckOps(int a)
	{
		int SKIP = 0;
		int cv;
		if(CI.charAt(i) == ' '){SKIP = 1;}
		else if(CI.charAt(i) == '+')
		{
			cv = Integer.parseInt((M.get(Mindex)).toString());
			M.set(Mindex,cv+1);
		}else if(CI.charAt(i) == '-')
		{
			cv = Integer.parseInt((M.get(Mindex)).toString());
			M.set(Mindex,cv-1);
		}else if(CI.charAt(i) == '!')
		{
			System.out.printf("%d",M.pop());
		}else if(CI.charAt(i) == '>')
		{
			Mindex+=1;
			if(Mindex > M.size())
			{
			M.push(0);
			}
		}else if(CI.charAt(i) == '<')
		{
			Mindex-=1;
			if(!(Mindex <1))
			{
			M.add(Mindex,0);
			}
		}
		return(SKIP);
	}
	public static void CheckArgs(int a)
	{
		
	}
	public static void CheckVals(int a)
	{
		
	}
}

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Array index out of range: 1
	at java.util.Vector.get(Unknown Source)
	at Compiler.CheckOps(Compiler.java:37)
	at Compiler.main(Compiler.java:22)

[JosAH]

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Array index out of range: 1
	at java.util.Vector.get(Unknown Source)
	at Compiler.CheckOps(Compiler.java:37)
	at Compiler.main(Compiler.java:22)

Check line #37 of your code; you're trying to get element #1 from a Vector while it contains only one element (only index value #0 is valid). Print out all variable values you don't trust just before you try to get that element.

kind regards,

Jos

[TheBreadCat]

Check line #37 of your code; you're trying to get element #1 from a Vector while it contains only one element (only index value #0 is valid). Print out all variable values you don't trust just before you try to get that element.

kind regards,

Jos

but should'nt the

if(Mindex = M.size()){M.push(0);}

part get rid of that?