hellofactory.java

JSP高级程序员网络开发源代码

package com.jspdev.ch20;

public class HelloFactory {

    public Hello getHello(String hello) {

        if (hello.equals("world"))
            return new HelloWorld();
        else if (hello.equals("spring"))
            return new HelloSpring();
        else
            throw new IllegalArgumentException("输入参数错误!");
    }
}