Exam 1z0-808 topic 1 question 201 discussion

isn't qty a local variable? and local variables can't be static?

To test: class StockRoom { private int stock = 10; public void purchase(int qty) { stock += qty; } public void sell (int qty) { stock -= qty; } public void printStock (String action) { System.out.println( action + ":" + qty + " items. Stock in Hand: " + stock); // qty needs to be static variable to compile. } } public class Test { public static void main(String[] args) { StockRoom k1 = new StockRoom(); k1.sell(5); k1.printStock("Sold"); StockRoom k2 = new StockRoom(); k2.purchase(5); k2.printStock("Purchased"); } }

Answer is C. Although executing the code does not produce the exact print reported. The only plausible answer is option C. Because the 'qty' variable needs to be static for the code to at least compile. Note that this variable is not declared as an attribute of the class, so it could not be called in the printStock() method, which causes the compilation error. For it to be enclosed in this method, it needs to be declared in the class, which is what option C proposes.

The answer is C, to perform the operation, the variables must be static to refer to a single value and the method must also be static, otherwise, variables that are static cannot be used inside it.