Example code of overriding and hiding methods. Check out my comments on http://goo.gl/wZL96

OverridingAndHidingTest.java

class SuperClass
{
  public static void runStatic(String code)
  {
    System.out.println(code + ": I am the runStatic method in SuperClass.");
  }

  public static void runStatic2(String code)
  {
    System.out.println(code + ": I am the runStatic2 method in SuperClass.");
  }

  public void run(String code)
  {
    System.out.println(code + ": I am the run method in SuperClass.");
  }
}

class SubClass extends SuperClass
{
  public static void runStatic(String code)
  {
    System.out.println(code + ": I am the runStatic method in SubClass.");
  }

  @Override
  public void run(String code)
  {
    System.out.println(code + ": I am the run method in SubClass.");
  }
}

public class OverridingAndHidingTest
{
  public static void main(String[] args)
  {
    SuperClass super1 = new SuperClass();
    System.out.println("SuperClass super1 = new SuperClass()");

    super1.run("super1.run()");
    // "I am the run method in SuperClass."
    super1.runStatic("super1.runStatic()");
    // "I am the runStatic method in SuperClass."
    // These are obvious.
    System.out.println();

    SuperClass sub1 = new SubClass();
    System.out.println("SuperClass sub1 = new SubClass()");

    sub1.run("sub1.run()");
    // "I am the run method in SubClass."
    // As you know, the run method in the SubClass object in overridden.

    sub1.runStatic("sub1.runStatic()");
    // "I am the runStatic method in SuperClass."
    // The type of sub1 variable is SuperClass so it calls the method in the
    // SuperClass not in the SubClass which means hiding works only when it's
    // called using ClassName.staticMethod().
    System.out.println();

    SubClass sub2 = new SubClass();
    System.out.println("SubClass sub2 = new SubClass()");

    sub2.run("sub2.run()");
    // "I am the run method in SubClass."
    // sub2 has an instance of SubClass so it executes the one in the SubClass.

    sub2.runStatic("sub2.runStatic()");
    // "I am the runStatic method in SubClass."
    // The type of the variable, sub2 is SubClass so calling runStatic()
    // executes the class method, runStatic, in the SubClass.
    System.out.println();

    SuperClass super2 = sub2;
    System.out.println("SuperClass super2 = sub2");
    // Now reassign an instance of SubClass (more precisely the reference to an
    // instance of SubClass) to the variable super2 the type of which is
    // SuperClass.
    super2.run("super2.run()");
    // "I am the run method in SubClass."
    // Although the type of super2 variable is SuperClass, it contains a
    // reference to an instance of SubClass so it executes the overridden run()
    // method in the SubClass.
    super2.runStatic("super2.runStatic()");
    // "I am the runStatic method in SuperClass."
    // The type of super2 is SuperClass and the static methods belong to the
    // class but not instance so it doesn't care about the instance and calls
    // the runStatic method in the class that is SuperClass.
    System.out.println();

    SubClass sub3 = (SubClass) super2;
    System.out.println("SubClass sub3 = (SubClass) super2");
    sub3.run("sub3.run()");
    // "I am the run method in SubClass."
    sub3.runStatic("sub3.runStatic()");
    // "I am the runStatic method in SubClass."
    // Reassigning it to SubClass type variable makes it use the runStatic
    // method in the SubClass.
    System.out.println();

    SubClass.runStatic("SubClass.runStatic()");
    // "I am the runStatic method in SubClass."
    // SubClass.runStatic() hides SuperClass.runStatic()
    SubClass.runStatic2("SubClass.runStatic2()");
    // "I am the runStatic2 method in SuperClass."
    System.out.println();

    SuperClass.runStatic("SuperClass.runStatic()");
    // "I am the runStatic method in SuperClass."
    SuperClass.runStatic2("SuperClass.runStatic2()");
    // "I am the runStatic2 method in SuperClass."
  }
}