staticmethodsdemo.java

来自「java编程代码」· Java 代码 · 共 29 行

/**
 Demonstrates that static methods use static binding.
*/
public class StaticMethodsDemo
{
    public static void main(String[] args)
    {
        Sale.announcement( );
        DiscountSale.announcement( );
        System.out.println(
             "That showed that you can override a static method definition.");

        Sale s = new Sale( );
        DiscountSale discount = new DiscountSale();
        s.announcement( );
        discount.announcement( );
        System.out.println("No surprises so far, but wait.");

        Sale discount2 = discount; 
        System.out.println(
              "discount2 is a DiscountSale object in a Sale variable.");
        System.out.println( "Which definition of announcement( ) will it use?");
        discount2.announcement( );
        System.out.println(
              "It used the Sale version of announcement( )!");
   }
}