Help me please, can't make a custom class file work

[colecifer]

I need to make a program where we make our own class and what it is suppoused to do is take two numbers and an operation sign, then compute. Here is my code and i get a couple errors i can't fix. Whats wrong with it?

public class Exercise
{
	
	
	public static void main(String args[])
	{
		System.out.println( Compute.computer(2.5, 0.5, + ));
		
	}




}
class Compute
{

	public static double computer(double double1, double double2, char char1)
	{
		double result;
		result = 0;
		
		switch (char1)
		{
		
		case '+': 
			result = double1 + double2;
			break;
		case '-':
			result = double1 - double2;
			break;
		case '*':
			result = double1 * double2;
			break;
		case '/':
			result = double1 / double2;
			break;
		}
		
		return result;			
	}
}

EDIT:
never mind i made it work, i just needed to put the operation in single quotes. Any mods that see this can go ahead and delete. No one replied so its sort of useless.