class SuperClass {
  public static void staticMethod() {
    System.out.println("Superclass's static method");
  }
  public void instanceMethod() {
    System.out.println("Superclass's instance method");
  }
}
 
public class Test extends SuperClass {
  public static void staticMethod() {
    System.out.println("Subclass's static method");
  }
  public void instanceMethod() {
    System.out.println("Subclass's instance method");
  }
  public static void main(String[] args) {
    SuperClass obj = new Test();
    obj.staticMethod();
    ((Test)obj).staticMethod();
    obj.instanceMethod();
    ((Test)obj).instanceMethod();
  }
}

結果:
Superclass's static method
Subclass's static method
Subclass's instance method
Subclass's instance method

被overriden的method沒有辦法再被呼叫, 除非透過override它的method, 使用super去呼叫
父別類與子類別有同名的static method....應該是稱做"hide"吧? (不知道有沒有記錯)
這種hide的情況, 透過casting就可以呼叫到不同的static method了
而override就沒辦法囉~

學習來源 :
http://www.javaworld.com.tw/jute/post/view?bid=29&id=13488&tpg=1&ppg=1&sty=1&age=0