Move into basic Java programming in the context of a wildlife simulation on an exotic island.

Introduction to Using Jeroo. The Jeroo’s World: Santong island is an uninhabited speck of land in the South Pacific Ocean. In the late 1980’s, naturalist Jessica Tong discovered two previously unknown species that are unique to this island. One is the jeroo, a rare mammal similar to the wallabies of Australia. The other is the large winsum flower that is the jeroo’s. Puppy Linux is an operating system and family of light-weight Linux distributions that focus on ease of use and minimal memory footprint.The entire system can be run from random-access memory with current versions generally taking up about 600 MB (64-bit), 300 MB (32-bit), allowing the boot medium to be removed after the operating system has started. Applications such as AbiWord, Gnumeric. Jeroo’s programming language styles make it suitable for use in a course where the primary programming language is Java, C, C#, or VB.NET. Written in Java and tested under Windows, Mac OS-X, Linux, and Solaris.

Santong island is an uninhabited speck of land in the South Pacific Ocean. In the late 1980's, naturalist Jessica Tong discovered two previously unknown species that are unique to this island. One is the jeroo, a rare mammal similar to the wallabies of Australia. The other is the large winsum flower that is the jeroo's primary food source.

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Like its distant Australian relative, the jeroo moves by hopping, but its movements are unique in all of nature. Each jeroo only moves in one of the four main compass directions, and only turns in 90 degree increments. This unusual behavior continues to mystify Jessica and the few other researchers who have observed jeroos in the wild. Some believe that this behavior is somehow related to geomagnetic forces, but others think that this is just a bizarre learned behavior.

Every jeroo has a pouch, but the male's pouch is somewhat smaller. While the female uses her pouch to protect and nuture her offspring, both sexes use their pouches to carry winsum flowers that they have picked.

During the rainy season, January through December, sudden storms can create temporary lakes and rivers, or even alter the shape of the island itself. Despite living on Santong island for uncounted millennia, the jeroos are extremely poor swimmers. While they are keenly aware of their immediate surroundings, jeroos can be careless. If one happens to hop into the ocean, its fur becomes waterlogged and it must rest in the sun for a few hours before resuming its normal activity. In what can only be described as a telepathic connection, all other jeroos also cease their activities until the wet jeroo has recovered.

Until recently, the jeroos were safe from human interference because they were only known to a handful of researchers and because Santong island is very small, very remote, and missing from most maps. The jeroo's idyllic world was interrupted in 2001, when Brian arrived at the island. Brian is a renowned collector who was hired to capture a jeroo for the extreme animal exhibit at Missouri's C. A. Baret zoo. Having studied the jeroos' unique patterns of movement, Brian periodically sets nets in the locations that a jeroo is likely to visit. Fortunately, the sensitive jeroos can detect his nets, and have learned that tossing a winsum flower onto a net will disable the net and make that location safe for future travel. Brian can only catch a careless jeroo that leaps before it looks.

A Jeroo Simulator

After returning from a recent trip to Santong island, Jessica asked her colleague, Deanna, to develop a simulator that could be used to demonstrate the jeroos and their relationship with their island. The result of Deanna's work is a computer program written in Java to help Jessica with her research. The program provides a micro-world representation of Santong island and shows the behavior of one or more jeroos on the island. This program also works as an Android app so that Jessica can take it with her into the field easily.

When Deanna designed the simulator, she used the jeroo's unique movements to model the island as a grid, where the x-axis runs from West to East along lines of lattitude, and the y-axis runs from North to South along lines of longitude. Each element (cell) of this model corresponds to a location where a jeroo might land when it hops.

Deanna chose to number both the x-coordinates and y-coordinates by starting with zero at the northwest corner of the map containing the island (her maps included the water immediately surrounding the island). When asked why she started at zero, Deanna said that she was counting the number of safe hops from any location to the northwest corner. We will use the notation (x, y) to indicate a specific cell, where x represents the horizontal position of the cell and y represents the vertical position of the cell.

Two of the Java classes in Deanna's simulation are Island and Jeroo. The Island class is a world subclass that represents the island map, while the Jeroo class is an actor subclass. There are also Flower, Net and Water classes to represent other objects on the island.

There as seven action methods that a Jeroo understands (three of them require an argument value):

Method	Purpose	Example
`hop()`	Hop one space ahead. The program terminates with a logic error if the hopping Jeroo lands in the water, lands on another Jeroo, or hops onto a net. A Jeroo can hop onto a flower.	`jessica.hop();`
`hop(number)`	Hop number times in a row, where number is a positive integer.	`jessica.hop(3);` `jessica.hop(12);`
`pick()`	Pick a flower from the current location. Nothing happens if there is no flower at the current location.	`jessica.pick();`
`plant()`	Plant a flower at the current location. Nothing happens if the jeroo does not have a flower to plant.	`jessica.plant();`
`toss()`	Toss a flower one space ahead. The tossed flower is lost forever. If the flower lands on a net, the net is disabled.	`jessica.toss();`
`turn(relativeDirection)`	Turn in the indicated direction [ `turn(AHEAD)` and `turn(HERE)` are meaningless ]	`jessica.turn(LEFT);` `jessica.turn(RIGHT);`
`give(relativeDirection)`	Give a flower to a neighboring Jeroo in the indicated direction. Nothing happens if the giving Jeroo has no flowers, or if there is no neighboring Jeroo in the indicated direction. [ `give(HERE)` is meaningless ]	`jessica.give(LEFT);` `jessica.give(RIGHT);` `jessica.give(AHEAD);`

Direction

Each Jeroo knows four relative directions and four compass directions as shown in the following table. Each direction must be written in UPPER CASE (In Java, constant values that never change are usually written this way). The relative direction HERE refers to the Jeroo's current location, so it isn't useful with the action methods in the previous section (we'll see other methods later where HERE makes sense).

Relative Directions	Compass Directions
`LEFT`	`NORTH`
`RIGHT`	`EAST`
`AHEAD`	`SOUTH`
`HERE`	`WEST`

Attributes

When designing an object to represent something, we must select facts about that thing that are relevant to the problem we are trying to solve. For example, the title of a book would be important to a bookstore, but not to the company that shipped the book from the publisher's warehouse. On the other hand, the weight of the book would be important to the shipper, but not to the bookstore. Facts such as the title or weight of a book are called attributes.

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