static 정리

  

    
    
    
    
  
class Foo {

    public static String classVar = "I class var";
    public String instanceVar = "I instance var";

}
public class StaticApp {
    public static void main(String[] args) {
        System.out.println(Foo.classVar); // ok
        System.out.println(Foo.instanceVar); // Error
    }
}