ok, I am getting close on this...I am just getting 2 errors.

Timing.java:45: class, interface, or enum expected
public static void exponential(int n){
^
Timing.java:47: class, interface, or enum expected
}
^
2 errors


Code:
public class Timing {
	public static void main(String[] args){
		
		long start, end;
		double result,difference;
		
	   	for(int n=1; n<=20; n++){                                                                                                                                                                                                                                                                                                                                                                                                          
			// Calculate the Time for n^2.
		   	start = System.nanoTime();
			// Call method to calculate n^2
				squared();
		   	end = System.nanoTime();
		   	difference = (end - start);	
				System.out.println(squared());
		}	
		
 	   	for(int n=1; n<=20; n++){   
		   // Calculate the Time for 2^n.
                                                                                                                                                                                                                                                                                                                                                                                                       
		   	start = System.nanoTime();
		  	// Call method to calculate 2^n
			exponential();
			end = System.nanoTime();
			difference = (end - start);	
			System.out.println(exponential());
  	}
	}
	
// Method to calculate n^2	
public static void squared(int n){
			result = n * n;
			
	}

	}
	
// Method to calculate 2^n
public static void exponential(int n){
		Math.pow(2, n);
	}
	
}

	
}
}