Infix to Postfix problem

[slixtrix]

import java.util.Scanner;
import java.io.*;

public class infixtopostfix {
String fname;
String output = "";
	
	public infixtopostfix(){
		System.out.println("starting infixtopostfix() method...");
		getFileName();
		readFileContents();
	}
	
	public int priority(Object x){
		if(x.equals('+') || x.equals('-')){
			return 1;
		}else if(x.equals('*') || x.equals('/')){
			return 2;
		}else{
			return 0;
		}
	}
	
	public void getFileName() {
		Scanner in = new Scanner(System.in);
		System.out.println("Enter file name please.");
		fname = in.nextLine();
		System.out.println("You entered " + fname);
	}
	
	public void readFileContents() {
		boolean looping;
		DataInputStream in;
		String line;
		int j, len;
		stackOb myStack = new stackOb(10);
 
		try {
			in = new DataInputStream(new FileInputStream(fname));
			looping = true;
			while (looping) {
				if (null == (line = in.readLine())) {
					looping = false;
					in.close();
				}
				else {
					myStack.reset();
					System.out.println("line: " + line);
					len = line.length();
					for(int i = 0; i < len; i++){
						char c = line.charAt(i);
						
						if(c == ('+') || c == ('*') || c == ('-') || c == ('/')){
							while(!myStack.empty() && priority(myStack.peek()) >= priority(c)){
								output += myStack.pop();
								myStack.push(c); 
							}
						}else if(c == '('){
							myStack.push(c);
						}else if(c == ')'){
							while(!myStack.peek().equals('(')){
								
							}
						}
					}
					
				}
			}
		}
 
		catch(IOException e) {
			System.out.println("Error " + e);
		} //end catch
	}
}

this is my code so far for my assignment...the problem i am having is that part that does

while(!myStack.peek().equals('(')){

it has a compile error telling me: Cannot invoke equals(char) on the primitive type char

how do i fix this?

[slixtrix]

still havn't figure it out, any help would be fantastic