Laboratory Activity: List and Sorting Algorithm

Magic.java

import java.util.ArrayList;
import java.util.Vector;

public class Magic {
	// DUPLICATE CHECKERS
	static boolean isDuplicate(String s, Vector<String> arr) { // String Array
		for(String x: arr) {
			if(x.equalsIgnoreCase(s)) {
				return true;
			}
		}
		return false;
	}
	static boolean isDuplicate(int s, Vector<Integer> arr) { // Integer Array
		for(int x: arr) {
			if(x == s) {
				return true;
			}
		}
		return false;
	}
	static boolean isDuplicate(double s, Vector<Double> arr) { // Double Array
		for(double x: arr) {
			if(x == s) {
				return true;
			}
		}
		return false;
	}
	static boolean isDuplicate(char s, Vector<Character> arr) { // Character Array
		for(char x: arr) {
			if(x == s) {
				return true;
			}
		}
		return false;
	}
	static boolean isDuplicate(String s, ArrayList<String> arr) { // String Array
		for(String x: arr) {
			if(x.equalsIgnoreCase(s)) {
				return true;
			}
		}
		return false;
	}
	static boolean isDuplicate(int s, ArrayList<Integer> arr) { // Integer Array
		for(int x: arr) {
			if(x == s) {
				return true;
			}
		}
		return false;
	}
	static boolean isDuplicate(double s, ArrayList<Double> arr) { // Double Array
		for(double x: arr) {
			if(x == s) {
				return true;
			}
		}
		return false;
	}
	static boolean isDuplicate(char s, ArrayList<Character> arr) { // Character Array
		for(char x: arr) {
			if(x == s) {
				return true;
			}
		}
		return false;
	}
	
	//STRING CLEANER
	static String cleanString(String s) { // CONVERTS RAW STRING TO A CLEAN STRING
		if(s.equals("")) return s;
		String temp = "", hold = "";
		char c;
		for (int i = 0; i < s.length(); i++) { // REMOVES INAPPROPRIATE WHITESPACES
			c = s.charAt(i);
			if(Character.isLetter(c)) {
				temp+=c;
			}
			else if(Character.isWhitespace(c) && temp.length() > 0 && !Character.isWhitespace(temp.charAt(temp.length()-1))) {
				temp+=" ";
			}
		}
		String[] arr = temp.split(" ");
		for (int i = 0; i < arr.length; i++) { // CONVERTS FIRST LETTER FOR EACH WORD
			arr[i] = arr[i].toUpperCase().charAt(0)+arr[i].toLowerCase().substring(1);
			hold+=arr[i];
			if(i != arr.length-1) {
				hold+=" ";
			}
		}
		return hold;
	}
	
	
	//SOMETHING
	static int toInteger(String s) { // CONVERTS STRING TO INTEGER
		String hold = "";
		char c;
		for(int i = 0; i < s.length(); i++) {
			c = s.charAt(i);
			if(Character.isDigit(c)) {
				hold+=c;
			}
			else if(c == '-' && hold.equals("")) {
				hold+=c;
			}
		}
		if(hold.equals("")) return -1;
		else return Integer.parseInt(hold);
	}
	static Double toDouble(String s) { // CONVERTS STRING TO DOUBLE
		String hold = "";
		int ctr = 0;
		char c;
		for(int i = 0; i < s.length(); i++) {
			c = s.charAt(i);
			if(Character.isDigit(c)) {
				hold+=c;
			}
			else if(c == '-' && hold.equals("")) {
				hold+=c;
			}
			else if(c == '.' && ctr != 1) {
				hold+=c;
				ctr++;
			}
		}
		if(hold.equals("")) return 0.0;
		else return Double.parseDouble(hold);
	}
	static boolean allWhite(String s) { // CHECKS WHITESPACE INPUTS
		char c;
		for(int i = 0; i < s.length(); i++) {
			c = s.charAt(i);
			if(!Character.isWhitespace(c)) {
				return false;
			}
		}
		return true;
	}
}

PetRecordsSystem.java

import java.util.ArrayList;
import javax.swing.JOptionPane;
import javax.swing.JTextArea;

public class PetRecordsSystem {
	static ArrayList<String> myPetList = new ArrayList<String>();
	static JOptionPane jop = new JOptionPane();
	public static void main(String[] args) {
		String menu[] = {"Add", "Insert", "Search", "Edit", "View", "Delete", "Count", "Terminate"};
 		String choice = "", message = "", header = "", name = "", name2 = "";
 		int index = 0;
		for(;;) {
			try {
				choice = jop.showInputDialog(null, "Please choose one:", "Pet List", 1, null, menu, menu[0]).toString();
			}catch (Exception e) {
				jop.showMessageDialog(null, "Good bye!", "Terminating...", 1);
				System.exit(0);
			}
			switch (choice) {
			case "Add":
				header = "Result:\n\n";
				name = Magic.cleanString(jop.showInputDialog("Enter student name:"));
				if(Magic.allWhite(name)) {
					message = "Invalid input!";
				} else if(Magic.isDuplicate(name, myPetList)) {
					message = name+" already exists!";
				}
				else {
					myPetList.add(name);
					message = name+" is successfully added!";
				}
				break;
			case "Insert":
				header = "Result:\n\n";
				name = Magic.cleanString(jop.showInputDialog("Enter student name:"));
				if(Magic.allWhite(name)) {
					message = "Invalid input!";
				}
				else if(Magic.isDuplicate(name, myPetList)) {
					message = "Cannot insert "+name+" because it is found at index "+myPetList.indexOf(name)+".";
				}
				else {
					index = Magic.toInteger(jop.showInputDialog("Enter index from 0 to "+(myPetList.size()-1)+":"));
					if(index < 0 || index >= myPetList.size()) {
						message = "Invalid index!";
					}
					else {
						myPetList.add(index, name);
						message = name+" is successfully added at index "+index+".";
					}
				}			
				break;
			case "Search":
				header = "Result:\n\n";
				name = Magic.cleanString(jop.showInputDialog("Enter student name:"));
				if(Magic.allWhite(name)) {
					message = "Invalid input!";
				}
				else if(Magic.isDuplicate(name, myPetList)) {
					message = name+" is at index "+myPetList.indexOf(name)+".";
				}
				else message = name+" is not found.";
				break;
			case "Edit":
				header = "Result:\n\n";
				name = Magic.cleanString(jop.showInputDialog("Enter student name:"));
				if(Magic.allWhite(name)) {
					message = "Invalid input!";
				}
				else if(Magic.isDuplicate(name, myPetList)) {
					name2 = Magic.cleanString(jop.showInputDialog(name+" is at index "+myPetList.indexOf(name)+".\nWhat is the new name?"));
					if(Magic.allWhite(name)) {
						message = "Invalid input!";
					}
					else if(Magic.isDuplicate(name2, myPetList)) {
						message = "Cannot add "+name2+" because it already exists at index "+myPetList.indexOf(name2)+".";
					}
					else {
						myPetList.set(myPetList.indexOf(name), name2);
						message = name+" is replaced with "+name2+".";
					}
				}
				else message = name+" is not found.";
				break;
			case "View":
				message = "";
				if(myPetList.size() == 0) {
					header = "Result\n\n";
					message = "The database is empty.";
				}
				else {
					header = "Name\tIndex\n";
					for (String x : myPetList) {
						message+=x+"\t"+myPetList.indexOf(x)+"\n";
					}
				}
				break;
			case "Delete":
				header = "Result:\n\n";
				name = Magic.cleanString(jop.showInputDialog("Enter student name:"));
				if(Magic.allWhite(name)) {
					message = "Invalid input!";
				}
				else if(Magic.isDuplicate(name, myPetList)) {
					myPetList.remove(myPetList.indexOf(name));
					message = name+" is at successfully deleted.";
				}
				else message = name+" is not found.";
				break;
			case "Count":
				header = "Result:\n\n";
				message = "Current Population: "+myPetList.size();
				break;
			case "Terminate":
				jop.showMessageDialog(null, "Good bye!", "Terminating...", 1);
				System.exit(0);
				break;
			}
			jop.showMessageDialog(null, new JTextArea(header+message));
		}
	}
}