在Java中从String创建实例 [英] Creating an instance from String in Java

问题描述

如果我有2个类，A和B，我怎么能创建一个通用工厂，所以我只需要将类名作为字符串传递给接收实例？

If I have 2 classes, "A" and "B", how can I create a generic factory so I will only need to pass the class name as a string to receive an instance?

示例：

public static void factory(String name) {
     // An example of an implmentation I would need, this obviously doesn't work
      return new name.CreateClass();
}

谢谢！

Joel

推荐答案

Class c= Class.forName(className);
return c.newInstance();//assuming you aren't worried about constructor .

• javadoc


• javadoc

用于调用带参数的构造函数

For invoking constructor with argument

 public static Object createObject(Constructor constructor,
      Object[] arguments) {

    System.out.println("Constructor: " + constructor.toString());
    Object object = null;

    try {
      object = constructor.newInstance(arguments);
      System.out.println("Object: " + object.toString());
      return object;
    } catch (InstantiationException e) {
      //handle it
    } catch (IllegalAccessException e) {
      //handle it
    } catch (IllegalArgumentException e) {
      //handle it
    } catch (InvocationTargetException e) {
      //handle it
    }
    return object;
  }
}

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