JavaLearning/fanshe/src/main/SimpleFactoryTest.java

package main;// Press Shift twice to open the Search Everywhere dialog and type `show whitespaces`,
// then press Enter. You can now see whitespace characters in your code.

public class SimpleFactoryTest
{
    public static void main(String[] args)
    {
        try
        {
            SimpleFactory.createProduct("A").show();
        }
        catch (NullPointerException e)
        {
            System.out.println("没有A这款产品，无法生产~");
        }

        try
        {
            SimpleFactory.createProduct("B").show();
        }
        catch (NullPointerException e)
        {
            System.out.println("没有B这款产品，无法生产~");
        }

        try
        {
            SimpleFactory.createProduct("C").show();
        }
        catch (NullPointerException e)
        {
            System.out.println("没有C这款产品，无法生产~");
        }

        try
        {
            SimpleFactory.createProduct("D").show();
        }
        catch (NullPointerException e)
        {
            System.out.println("没有D这款产品，无法生产~");
        }
    }
}