Repast Java入门教程：搭建僵尸追逐模型

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Repast Java Getting Started 是一本针对Repast J 3.1的入门教程，由Nick Collier和Michael North撰写，旨在帮助读者通过实例深入理解和掌握Repast Simphony在Java环境下的开发。该教程首先强调了安装最新版本Repast Simphony的重要性，推荐使用Java 8，可以在Java Standard Edition下载页面找到。在开始前，确保你已经成功下载并安装了Repast Simphony，这对于后续的模型开发至关重要。教程的主体部分围绕一个简单的代理模型展开，模拟僵尸追逐人类和人类躲避僵尸的情境，最终目标是创建如图1所示的运行模型。教程的步骤具体包括： 1. 启动Repast Simphony视角：在预装有Repast Simphony的Eclipse IDE中，你需要打开Repast Simphony视角，这将为Java项目开发提供便利的功能菜单和工具栏。要在Eclipse中激活此视角，你需要点击Window菜单，然后选择Open Perspective，接着在弹出的对话框中选择Repast Simphony。在这个视角下，开发者可以更轻松地进行Java项目的构建，比如编写和管理代理类（Agents）、空间（Spaces）和事件驱动的行为（Event Driven Behaviors）。教程将引导你创建和配置这些核心组件，以及如何设置和运行模拟。通过这个教程，初学者可以学习到如何在Repast J 3.1环境中设计、实现和测试复杂的Agent-Based Modeling (ABM)项目。它不仅教授技术细节，也注重培养理解和应用仿真方法论的能力，让你能够利用Repast Java平台解决实际问题。对于想要在模拟领域进行研究或实践的开发者来说，这本书是一个宝贵的资源。

REPAST JAVA GETTING STARTED 7

update the Zombies position in the Grid by converting its location in the ContinuousSpace

to int coordinates appropriate for a Grid.

Once you’ve written this moveTowards() method, add a call to it in the step() method.

The end of the step() should now look like:

1 for ( GridCell < Human > cell : gri dCells ) {

2 if ( cell . size () > maxCou nt ) {

3 p oi ntW it hMo st Hum an s = cell . getPoint ();

4 maxCo unt = cell . size ();

5 }

6 }

7 moveTowards ( p ointW ithMo stH um ans );

Listing 5. Step with MoveTowards Added

Note the addition of the call to moveTowards() following the for loop.

We want the step method to be called every iteration of the simulation. We can do this

by adding an @ScheduledMethod annotation on it. Obviously, the method itself is part of a

class, and thus what we are actually scheduling are invocations of this method on instances

of this class. For example, if we have 10 Zombies, then we can schedule this method to be

called on each of those Zombies. The annotation has a variety of parameters that are used

to specify when and how often the method will be called, the number of object instances

to invoke the method on, and so on.

1 @S che du le dMe th od ( start = 1, int erval = 1)

2 public void step () {

3 // get the grid l oca tion of this Zombie

4 GridPoint pt = grid . ge tL ocation ( this );

Listing 6. Step Method with Annotation

The parameters here in line 1 will schedule the step method to be called on all Zombies

starting at tick (timestep) 1 and every tick thereafter.

Let’s now turn to the code for the Humans. Select Human.java in Eclipse’s editor

pane. The basic behavior for a Human is to react when a Zombie comes within its local

neighborhood by running away from the area with the most Zombies. Additionally, Humans

have a certain amount of energy that is expended in running away. If this energy is 0 or

less then a Human is unable to run. We begin by creating the relevant ﬁeld variables and

constructor.

See the Repast Java API documentation and the Repast Reference for more information on the

@ScheduledMethod annotation.

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