Create initial classes

src/main/java/com/mattrixwv/adventOfCode24/ProblemSelector.java

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+package com.mattrixwv.adventOfCode24;
+
+
+import java.security.InvalidParameterException;
+import java.util.List;
+import java.util.Scanner;
+import java.util.StringJoiner;
+
+import com.mattrixwv.adventOfCode24.days.Problem;
+
+
+public class ProblemSelector{
+	private static final Scanner input = new Scanner(System.in);
+	//Holds the valid problem numbers
+	protected static final List<Integer> PROBLEM_NUMBERS = List.of(0);
+
+
+	private ProblemSelector(){
+		throw new IllegalStateException("Utility class");
+	}
+
+
+	//Returns the problem corresponding to the given problem number
+	public static Problem getProblem(Integer dayNumber){
+		Problem day = null;
+		switch(dayNumber){
+			default: throw new InvalidParameterException();
+		}
+		//return day;
+	}
+
+	//Print the description of a problem
+	public static void printDescription(Integer problemNumber){
+		//Get the problem
+		Problem day = getProblem(problemNumber);
+		//Print the problem's description
+		System.out.println(day.getDescription());
+	}
+
+	//Solve a problem
+	public static void solveProblem(Integer problemNumber){
+		//Get the problem
+		Problem problem = getProblem(problemNumber);
+		System.out.println("\n\n\n");
+		//Print the problem description
+		System.out.println(problem.getDescription());
+		//Solve the problem
+		problem.runSolution();
+		//Print the results
+		System.out.println(problem.getResult());
+		System.out.println("\n\n\n");
+	}
+
+	//Get a valid problem number from a user
+	public static Integer getProblemNumber(){
+		Integer problemNumber = 0;
+		System.out.print("Enter a problem number: ");
+		problemNumber = input.nextInt();
+		while(!PROBLEM_NUMBERS.contains(problemNumber)){
+			System.out.print("That is an invalid problem number!\n Enter a problem number: ");
+			problemNumber = input.nextInt();
+		}
+		return problemNumber;
+	}
+
+	//List all valid problem numbers
+	public static void listProblems(){
+		StringJoiner joiner = new StringJoiner(", ");
+		for(Integer num : PROBLEM_NUMBERS){
+			joiner.add(num.toString());
+		}
+		System.out.println(joiner.toString());
+		System.out.println();
+	}
+}