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Thread: problem with inheritance

  1. #1
    Junior Member
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    Default problem with inheritance

    package exam804;
    class Base
    {
    public static void foo(Base bObj)
    {
    System.out.println("In Base.foo()");
    bObj.bar();
    }

    public void bar()
    {
    System.out.println("In Base.bar()");
    }
    }

    class Derived extends Base
    {
    public static void foo(Base bObj)
    {
    System.out.println("In Derived.foo()");
    bObj.bar();
    }

    public void bar()
    {
    System.out.println("In Derived.bar()");
    }
    }

    class OverrideTest
    {
    public static void main(String[] args)
    {
    Base bObj = new Derived();
    bObj.foo(bObj);
    }
    }

    why the output is
    "In Base.foo() In Derived.bar()" and not
    "In Derived.foo() In Derived.bar()" ?


  2. #2
    Super Moderator helloworld922's Avatar
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    Default Re: problem with inheritance

    Static methods aren't polymorphic. Which static method is invoked is determined by: 1. The type of the variable being used (note that the variable type is not necessarily the same as the type of the object held), or 2. The class quantifier provided.

    Using an instance variable to call a static method is discouraged. Instead, use:

    Base.foo();
    Derived.foo();

  3. #3
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    Default Re: problem with inheritance

    tanks

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