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Understanding Class Inheritance
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System.out.println("\tCurrent Age: " + getAge() + " " + "Current Height: " + getHeight()); } public void doFall() { System.out.println("Fall: The maple tree has stopped growing" + " and is losing its leaves"); System.out.println("\tCurrent Age: " + getAge() + " " + "Current Height: " + getHeight()); } public void doWinter() { System.out.println("Winter: The maple tree is dormant"); System.out.println("\tCurrent Age: " + getAge() + " " + "Current Height: " + getHeight()); } }
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The preceding class is the MapleTree class. It extends the Plant class and is used as a simple representation of a maple tree. Since the Plant class is abstract, the MapleTree class must implement all of its abstract methods. The MapleTree class contains one variable named AMOUNT_TO_GROW_IN_ONE_GROWING_SEASON. This variable is marked as private static final int. This is how Java declares a constant. These details are beyond the scope of the SCJA exam. Just consider this a constant that is a primitive int and is private. This variable is used to set the amount of growth that a maple tree completes during a growing season. The MapleTree class contains a method to grow, called grow(). This method is used to add the new height to the current height. The next four methods are all methods required to be implemented. These abstract methods are declared in the Plant class, with each one representing a different season. When they are invoked, they perform any required action that is needed for that season and then print two lines to standard out. The first line of text states what season it is and what the maple tree is doing. The next line displays the values of the age and height variables.
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public class Tulip extends Plant { private static final int AMOUNT_TO_GROW_IN_ONE_GROWING_SEASON = 1; //A tulip grows each year to the same height. During //the winter they die down to ground level. private void grow() { int currentHeight = getHeight();
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setHeight(currentHeight + AMOUNT_TO_GROW_IN_ONE_GROWING_SEASON); } private void dieDownForWinter(){ setHeight(0); } public void doSpring() { grow(); addYearToAge(); System.out.println("Spring: The tulip is starting to grow " + "up from the ground"); System.out.println("\tCurrent Age: " + getAge() + " " + "Current Height: " + getHeight()); } public void doSummer() { System.out.println("Summer: The tulip has stopped growing " + "and is flowering"); System.out.println("\tCurrent Age: " + getAge() + " " + "Current Height: " + getHeight()); } public void doFall() { System.out.println("Fall: The tulip begins to wilt"); System.out.println("\tCurrent Age: " + getAge() + " " + "Current Height: " + getHeight()); } public void doWinter() { dieDownForWinter(); System.out.println("Winter: The tulip is dormant underground"); System.out.println("\tCurrent Age: " + getAge() + " " + "Current Height: " + getHeight()); } }
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The preceding class is the Tulip class. It is intended to represent a tulip. It extends the Plant class and therefore must also implement all its abstract methods. Like the MapleTree class, the Tulip class also has a constant that is used to store the amount of growth per growing season. The Tulip class has two private methods. A grow() method that is like the one present in the MapleTree class. It also has a method named dieDownForWinter().
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Understanding Class Inheritance
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This method is used to reset the height to zero when the tulip loses all of its leaves during the winter. The last four methods in the class are the abstract methods from the Plant class. Each season method performs the needed actions first, such as grow, die down, or age. It then prints to standard out a message about what it is doing, and what season it is. The second line of text contains the values of the age and height variables.
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public class Simulator{ public static void main(String[] args) { System.out.println("Creating a maple tree and tulip..."); MapleTree mapleTree = new MapleTree(); Tulip tulip = new Tulip(); System.out.println("Entering a loop to simulate 3 years"); for (int i = 0; i < 3; i++) { mapleTree.doSpring(); tulip.doSpring(); mapleTree.doSummer(); tulip.doSummer(); mapleTree.doFall(); tulip.doFall(); mapleTree.doWinter(); tulip.doWinter(); } } }
This final code segment is the main() method that uses both the Tulip and MapleTree classes. First, an object of each type is created. Then there is a for loop that invokes the methods for all four seasons for each object. This loop represents a simple simulation program. Each time through the loop represents one year. Both objects age and grow from year to year. When the preceding code is executed, it will produce the output shown next.
Creating a maple tree and tulip... Entering a loop to simulate 3 years Spring: The maple tree is starting to grow leaves and new branches Current Age: 1 Current Height: 2 Spring: The tulip is starting to grow up from the ground Current Age: 1 Current Height: 1 Summer: The maple tree is continuing to grow Current Age: 1 Current Height: 4 Summer: The tulip has stopped growing and is flowering
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