actionfactory.java

简易的java问答系统

package cn.netjava.factory;

import cn.netjava.action.*;

public class ActionFactory {

	private static ActionFactory af;

	// 不允许实例化
	private ActionFactory() {
	}

	/**
	 * 单实例方法
	 * 
	 * @return 动作工厂
	 */
	public static ActionFactory getIns() {
		if (null == af)
			af = new ActionFactory();
		return af;
	}

	/**
	 * 根据给出的动作类类名创建动作类对象
	 * @param actionClassName:要创建的动作类的类名
	 * @return 动作类对象
	 */
	public Action getAction(String actionClassName) {
		Action actionInstance = null;
		try {
			Class c = Class.forName(actionClassName);
			actionInstance = (Action) c.newInstance();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return actionInstance;
	}

}