Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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public class Plant {
protected String plantName;
protected String plantCost;

public void setPlantName(String userPlantName) {
plantName = userPlantName;
}

public String getPlantName() {
return plantName;
}

public void setPlantCost(String userPlantCost) {
plantCost = userPlantCost;
}

public String getPlantCost() {
return plantCost;
}

public void printInfo() {
System.out.println(" Plant name: " + plantName);
System.out.println(" Cost: " + plantCost);
}
}

public class Flower extends Plant {

private boolean isAnnual;
private String colorOfFlowers;

public void setPlantType(boolean userIsAnnual) {
isAnnual = userIsAnnual;
}

public boolean getPlantType(){
return isAnnual;
}

public void setColorOfFlowers(String userColorOfFlowers) {
colorOfFlowers = userColorOfFlowers;
}

public String getColorOfFlowers(){
return colorOfFlowers;
}

@Override
public void printInfo(){
System.out.println(" Plant name: " + plantName);
System.out.println(" Cost: " + plantCost);
System.out.println(" Annual: " + isAnnual);
System.out.println(" Color of flowers: " + colorOfFlowers);
}
}

[画像:**Java Code: PlantArrayListExample** This code snippet is an example of a Java program that aims to create an `ArrayList` to store objects representing plants or flowers. Below is the transcribed code with comments explaining the intended actions: ```java import java.util.StringTokenizer; public class PlantArrayListExample { // TODO: Define a printArrayList method that prints an ArrayList of plant (or flower) objects public static void main(String[] args) { Scanner scnr = new Scanner(System.in); String input; // TODO: Declare an ArrayList called myGarden that can hold objects of type plant // TODO: Declare variables - plantName, plantCost, flowerName, flowerCost, colorOfFlowers, isAnnual input = scnr.next(); while (!input.equals("-1")) { // TODO: Check if input is a plant or flower // Store as a plant object or flower object // Add to the ArrayList myGarden input = scnr.next(); } // TODO: Call the method printArrayList to print myGarden } } ``` **Explanation** - **Import Statement (Line 1):** The code imports the `StringTokenizer` class from Java's utility package, although not used in this snippet, it might be planned for parsing strings efficiently. - **Class Declaration (Line 3):** The class `PlantArrayListExample` is defined. It likely includes methods and data related to plant objects. - **Main Method (Lines 5-19):** - The main method begins by creating a `Scanner` object `scnr` to read user input. - A `String` variable `input` is declared to receive input values. - A placeholder is present to declare an `ArrayList` called `myGarden`. This list will potentially store plant or flower objects. - Additional placeholder comments suggest the need to declare several variables for storing attributes like `plantName`, `plantCost`, `flowerName`, `flowerCost`, `colorOfFlowers`, and `isAnnual`. - A loop is set to continue taking inputs until the user enters `-1`. Inside this loop, checks will be made to determine if the input corresponds to a plant or a flower, then store it in the `myGarden` ArrayList. - A final comment hints at a method `printArrayList]
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Transcribed Image Text:**Java Code: PlantArrayListExample** This code snippet is an example of a Java program that aims to create an `ArrayList` to store objects representing plants or flowers. Below is the transcribed code with comments explaining the intended actions: ```java import java.util.StringTokenizer; public class PlantArrayListExample { // TODO: Define a printArrayList method that prints an ArrayList of plant (or flower) objects public static void main(String[] args) { Scanner scnr = new Scanner(System.in); String input; // TODO: Declare an ArrayList called myGarden that can hold objects of type plant // TODO: Declare variables - plantName, plantCost, flowerName, flowerCost, colorOfFlowers, isAnnual input = scnr.next(); while (!input.equals("-1")) { // TODO: Check if input is a plant or flower // Store as a plant object or flower object // Add to the ArrayList myGarden input = scnr.next(); } // TODO: Call the method printArrayList to print myGarden } } ``` **Explanation** - **Import Statement (Line 1):** The code imports the `StringTokenizer` class from Java's utility package, although not used in this snippet, it might be planned for parsing strings efficiently. - **Class Declaration (Line 3):** The class `PlantArrayListExample` is defined. It likely includes methods and data related to plant objects. - **Main Method (Lines 5-19):** - The main method begins by creating a `Scanner` object `scnr` to read user input. - A `String` variable `input` is declared to receive input values. - A placeholder is present to declare an `ArrayList` called `myGarden`. This list will potentially store plant or flower objects. - Additional placeholder comments suggest the need to declare several variables for storing attributes like `plantName`, `plantCost`, `flowerName`, `flowerCost`, `colorOfFlowers`, and `isAnnual`. - A loop is set to continue taking inputs until the user enters `-1`. Inside this loop, checks will be made to determine if the input corresponds to a plant or a flower, then store it in the `myGarden` ArrayList. - A final comment hints at a method `printArrayList
[画像:Given a base `Plant` class and a derived `Flower` class, complete `main()` to create an `ArrayList` called `myGarden`. The `ArrayList` should be able to store objects that belong to the `Plant` class or the `Flower` class. Create a method called `printArrayList()`, that uses the `printInfo()` methods defined in the respective classes and prints each element in `myGarden`. The program should read plants or flowers from input (ending with -1), add each `Plant` or `Flower` to the `myGarden` `ArrayList`, and output each element in `myGarden` using the `printInfo()` method. Example: If the input is: ``` plant Spirea 10 flower Hydrangea 30 false lilac flower Rose 6 false white plant Mint 4 -1 ``` The output is: ``` Plant 1 Information: Plant name: Spirea Cost: 10 Plant 2 Information: Plant name: Hydrangea Cost: 30 Annual: false Color of flowers: lilac Plant 3 Information: Plant name: Rose Cost: 6 Annual: false Color of flowers: white Plant 4 Information: Plant name: Mint Cost: 4 ```]
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Transcribed Image Text:Given a base `Plant` class and a derived `Flower` class, complete `main()` to create an `ArrayList` called `myGarden`. The `ArrayList` should be able to store objects that belong to the `Plant` class or the `Flower` class. Create a method called `printArrayList()`, that uses the `printInfo()` methods defined in the respective classes and prints each element in `myGarden`. The program should read plants or flowers from input (ending with -1), add each `Plant` or `Flower` to the `myGarden` `ArrayList`, and output each element in `myGarden` using the `printInfo()` method. Example: If the input is: ``` plant Spirea 10 flower Hydrangea 30 false lilac flower Rose 6 false white plant Mint 4 -1 ``` The output is: ``` Plant 1 Information: Plant name: Spirea Cost: 10 Plant 2 Information: Plant name: Hydrangea Cost: 30 Annual: false Color of flowers: lilac Plant 3 Information: Plant name: Rose Cost: 6 Annual: false Color of flowers: white Plant 4 Information: Plant name: Mint Cost: 4 ```
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