多态

class Base
{
    public void method()
    {
        System.out.println("Base");
    }
}
class Son extends Base
{
    public void method()
    {
        System.out.println("Son");
    }

    public void methodB()
    {
        System.out.println("SonB");
    }
}
public class Test01
{
    public static void main(String[] args)
    {
        Base base = new Son();
        base.method();
        base.methodB();
    }
}