Session 18

Source Code

import java.util.*;

public class Session18 {
    public static void main(String[] args) {
        System.out.println("Session 18");

        // Menu
        System.out.println("Menu");
        System.out.println("E1 - Example 1");
        System.out.println("Q  - Quit");

        // setup Scanner
        Scanner in = new Scanner(System.in);
        System.out.print("Choice: ");
        String choice = in.nextLine();

        // switch choices
        switch (choice) {
            case "E1":
                System.out.println("Example 1");
                example1();
                break;
            case "E2":
                System.out.println("Example 2");
                example2();
                break;
            case "E3":
                System.out.println("Example 3");
                example3();
                break;
            case "E4":
                System.out.println("Example 4");
                example4();
                break;
            case "E5":
                System.out.println("Example 5");
                example5();
                break;
            case "E6":
                System.out.println("Example 6");
                example6();
                break;
            case "E7":
                System.out.println("Example 7");
                example7();
                break;
            case "E8":
                System.out.println("Example 8");
                example8();
                break;
            case "E9":
                System.out.println("Example 9");
                example9();
                break;
            case "E10":
                System.out.println("Example 10");
                example10();
                break;
            case "E11":
                System.out.println("Example 11");
                example11();
                break;
            case "E12":
                System.out.println("Example 12");
                example12();
                break;
            case "Q":
                System.out.println("Quitting..!");
                break;
        }
    }

    // example1 method
    public static void example1() {
        // declare and create an array
      

        // for loop to traverse the array

    }

    // example2 method
    public static void example2() {
        // declare and create an array
      

        // while loop to traverse the array
     
    }


    // printArray method



    // example3 method
    public static void example3() {
        // declare array numbers
        
        // pass numbers to printArray method
        

    }

    // changeArray method


    // example4 method
    public static void example4() {
        // declare array numbers
        
        // pass numbers to changeArray method
        


    }

    // example5 method
    public static void example5() {
        // create an array of friends

        // for loop

        // enhanced for loop

    }

    // example6 method
    public static void example6() {

    }
    // example7 method
    public static void example7() {

    }
    // example8 method
    public static void example8() {

    }
    // example9 method
    public static void example9() {

    }
    // example10 method
    public static void example10() {

    }
    // example11 method
    public static void example11() {

    }
    // example12 method
    public static void example12() {

    }
}

S18Problem1.java

import java.util.*;

public class S18Problem1 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("Problem 1");

        
    }
}

S18Problem2.java

import java.util.*;

public class S17Problem2 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("Problem 2");

        
    }
}

S18Problem3.java

import java.util.*;

public class S17Problem3 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("Problem 3");

        
    }
}

CommandLineArgs.java

public class CommandLineArgs {
    public static void main(String[] args) {
        System.out.println("Number of arguments: " + args.length);
        for (int i = 0; i < args.length; i++) {
            System.out.println("Argument " + i + ": " + args[i]);
        }
    }
}

CommandLineSum.java

public class CommandLineSum {
    public static void main(String[] args) {
        if (args.length < 2) {
            System.out.println("Please provide two numbers.");
            return;
        }

        int num1 = Integer.parseInt(args[0]);
        int num2 = Integer.parseInt(args[1]);
        int sum = num1 + num2;

        System.out.println("Sum: " + sum);
    }
}

S18Problem4.java

import java.util.*;

public class S18Problem4{
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("Problem 4");

        
    }
}

S18Problem5.java

import java.util.*;

public class S18Problem5 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("Problem 5");

        
    }
}

S18Problem6.java

import java.util.*;

public class S18Problem6 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("Problem 6");

        
    }
}

S18Problem7.java

import java.util.*;

public class S18Problem7 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("Problem 7");

        
    }
}

S18Problem8java

import java.util.*;

public class S18Problem8 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("Problem 8");

        
    }
}

S18Problem9.java

import java.util.*;

public class S18Problem9 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("Problem 9");

        
    }
}

S18Problem10java

import java.util.*;

public class S18Problem10 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("Problem 10");

        
    }
}

S18Problem11java

import java.util.*;

public class S18Problem11 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("Problem 11");

        
    }
}

Horse.java

public class Horse {
    private String name;
    private int weight;

    public Horse(String name, int weight) {
        this.name = name;
        this.weight = weight;
    }

    public String getName() {
        return name;
    }

    public int getWeight() {
        return weight;
    }
}

HorseBarn.java

/**
 * HorseBarn - A class to manage horses in a barn with numbered spaces.
 * Each space can hold at most one horse, and each horse has a unique name.
 */
public class HorseBarn {
    // Instance Variables
    private Horse[] spaces; // Array to store horses, null represents empty space

    /**
     * Constructor for HorseBarn
     *
     * @param numberOfSpaces the number of spaces in the barn
     */
    public HorseBarn(int numberOfSpaces) {
        spaces = new Horse[numberOfSpaces];
    }

    /**
     * Returns the index of the space that contains the horse with the specified
     * name.
     *
     * @param name the name of the horse to find
     * @return the index of the space containing the horse with the specified name;
     *         -1 if no horse with the specified name is in the barn.
     */
    public int findHorseSpace(String name) {
        // Input validation
        if (name == null) {
            return -1;
        }

        // Search through all spaces
        for (int i = 0; i < spaces.length; i++) {
            // Check if space has a horse and if the names match
            if (spaces[i] != null && spaces[i].getName().equals(name)) {
                return i;
            }
        }

        // Horse not found
        return -1;
    }

    /**
     * Consolidates the barn by moving horses so that the horses are in adjacent
     * spaces,
     * starting at index 0, with no empty space between any two horses.
     * The order of the horses remains the same as before the consolidation.
     */
    public void consolidate() {
        // Create temporary array
        Horse[] temp = new Horse[spaces.length];
        int nextPosition = 0;

        // Copy non-null horses in order
        for (int i = 0; i < spaces.length; i++) {
            if (spaces[i] != null) {
                temp[nextPosition] = spaces[i];
                nextPosition++;
            }
        }

        // Replace original array with consolidated version
        spaces = temp;
    }

    /**
     * Adds a horse to the first available (empty) space in the barn.
     *
     * @param horse the horse to add
     * @return true if the horse was added successfully, false if the barn is full
     *         or if a horse with the same name already exists
     */
    public boolean addHorse(Horse horse) {
        // Input validation
        if (horse == null) {
            return false;
        }

        // Check if horse with same name already exists
        if (findHorseSpace(horse.getName()) != -1) {
            return false;
        }

        // Find first empty space
        for (int i = 0; i < spaces.length; i++) {
            if (spaces[i] == null) {
                spaces[i] = horse;
                return true;
            }
        }

        // No empty space found
        return false;
    }

    /**
     * Removes a horse from the barn by name.
     *
     * @param name the name of the horse to remove
     * @return true if the horse was removed successfully, false if the horse wasn't
     *         found
     */
    public boolean removeHorse(String name) {
        int index = findHorseSpace(name);
        if (index != -1) {
            spaces[index] = null;
            return true;
        }
        return false;
    }

    /**
     * Returns the horse at the specified index.
     *
     * @param index the index of the space to check
     * @return the horse at the specified space, or null if the space is empty
     *         or the index is invalid
     */
    public Horse getHorse(int index) {
        if (index >= 0 && index < spaces.length) {
            return spaces[index];
        }
        return null;
    }

    /**
     * Returns the number of spaces in the barn.
     *
     * @return the total number of spaces
     */
    public int getSpaces() {
        return spaces.length;
    }

    /**
     * Returns the number of horses currently in the barn.
     *
     * @return the number of occupied spaces
     */
    public int getNumberOfHorses() {
        int count = 0;
        for (Horse horse : spaces) {
            if (horse != null) {
                count++;
            }
        }
        return count;
    }

    /**
     * Returns true if the barn is empty (contains no horses).
     *
     * @return true if the barn is empty, false otherwise
     */
    public boolean isEmpty() {
        return getNumberOfHorses() == 0;
    }

    /**
     * Returns true if the barn is full (all spaces occupied).
     *
     * @return true if the barn is full, false otherwise
     */
    public boolean isFull() {
        return getNumberOfHorses() == spaces.length;
    }

    /**
     * Returns a string representation of the barn.
     *
     * @return a string showing the contents of each space in the barn
     */
    @Override
    public String toString() {
        StringBuilder result = new StringBuilder();
        result.append("HorseBarn with ").append(spaces.length).append(" spaces:\n");
        for (int i = 0; i < spaces.length; i++) {
            result.append("Space ").append(i).append(": ");
            if (spaces[i] == null) {
                result.append("empty");
            } else {
                result.append(spaces[i].getName()).append(" (").append(spaces[i].getWeight()).append(" lbs)");
            }
            result.append("\n");
        }
        return result.toString();
    }

    public static void main(String[] args) {
        // Create test barn
        

        // Test 1: Empty barn
        

        // Add horses
        

        // print the barn layout
        

        // Test 2: Find existing horses
        

        // Test 3: Find non-existent horse
        

        // Test 4: Consolidate
        
        
    }
}