Method peek

java/Chapter 3/Question3_1/Question.java:44–49

(int stackNum)

	}

	static int peek(int stackNum) {
		if (isEmpty(stackNum)) {
			throw new EmptyStackException();
		}		
		return buffer[absTopOfStack(stackNum)];
	}

	static boolean isEmpty(int stackNum) {
		return stackPointer[stackNum] == -1;