whats wrong with mine,and why?

真不理解

public class Cat { private static int catCount = 0; public static void setCatCount(int catCount) { //在此编写你的代码 Cat.catCount = catCount; } public static void main(String[] args) { setCatCount(2); } }

In this particular task the use of the word static in the method declaration is very important. The keyword 'this' is used when referring to the current object. 'static' methods can be called without an associated object. When considering that static methods can be called without the use of an object, and 'this' points to the current object; the use of the this keyword doesn't make sense when in a static method. You will need to use the name of the class (Cat in this task) instead of the this keyword.