Posted By

eiger824 on 01/21/13

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Basic Database in Java. Updated Version

/ Published in: Java

URL: http://programmingeiger824.blogspot.com

A basic database made in Java. It resembles a mobile phone contacts activity in which user is prompted to introduce some data of new contacts.

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package com.santi;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Date;

public class Main {

public static void main(String[] args) {
		//declaration of arraylist-type variables
		ArrayList<String> names=new ArrayList<String>();
		ArrayList<String> last_names=new ArrayList<String>();
		ArrayList<String> phones=new ArrayList<String>();
		ArrayList<String> emails=new ArrayList<String>();
		//declaration of a Date-type variable
		Date date1 = new Date();
		//rest of auxiliary variables
		int cont=0;
		boolean a =true;
		//end of variable declarations
		System.out.println("Program started on " + date1);
		//main while loop
		while (a==true){
			if(names.size()==0 && last_names.size()==0 && phones.size()==0 && emails.size()==0) System.out.flush();
		System.out.println("Please select an option: ");
		String option2 = getInput("1. Add contact." +
				"2. Show contacts." +
				"3. Remove contact. 0. Exit program. : ");
		int opt=Integer.parseInt(option2);
		switch (opt) {
		case 1:
				names.add(getInput("Name: "));
				last_names.add(getInput("Last name: "));
				phones.add(getInput("Phone number: "));
				emails.add(getInput("Email: "));
			
			break;
		case 2:
			if (names.isEmpty() && last_names.isEmpty() && phones.isEmpty() && emails.isEmpty()) {
				System.out.println("There are no contacts yet!");
			}
			else {
				for (int i = 0; i < names.size(); i++) {
					System.out.println(i+1 + "- ");
					String aux_name = names.get(i);
					System.out.println(aux_name);
					String aux_last_name = last_names.get(i);
					System.out.println(aux_last_name);
					String aux_phone = phones.get(i);
					System.out.println(aux_phone);
					String aux_email = emails.get(i);
					System.out.println(aux_email);
				}

}
			break;
			
		case 3:
			if (names.isEmpty() && last_names.isEmpty() && phones.isEmpty() && emails.isEmpty()) {
				System.out.println("There are no contacts yet!");
			}
			else if(names.size()==1){
				names.clear();
				last_names.clear();
				phones.clear();
				emails.clear();
				System.out.println("All contacts succesfully erased! No contacts in database anymore.");
				break;
			}
			else {
				cont=0;
				String option=getInput("1.REMOVE BY NAME. 2.REMOVE ALL. : ");
				int option3 = Integer.parseInt(option);
				switch (option3){
				case 1:
				String chc = getInput("Please enter the name of the contact you wish to erase: ");
				for (String name : names) {
					if (chc.equals(name)) {
						//remove all fields of data in that position
						names.remove(chc);
						last_names.remove(chc);
						phones.remove(chc);
						emails.remove(chc);
						System.out.println("Contact succesfully erased!");
						break;
					}cont++;
				}
				if (cont==names.size()) {
					System.out.println("WARNING: No matches between provided name and stored names. Remember: this program is case-sensitive!");
				}

break;
				case 2:
					names.clear();
					last_names.clear();
					phones.clear();
					emails.clear();
					System.out.println("All contacts succesfully erased! No contacts in database anymore.");
					break;
				}
				break;
			}
			break;
		case 0:
			Date date2 = new Date();
			System.out.println("Program ended on " + date2);
			System.out.println("Developed by Santi Pagola.");
			a=false;
			break;
		}
		
	}
	
}

private static String getInput(String prompt) {
		BufferedReader stdin = new BufferedReader(
				new InputStreamReader(System.in));
		
		System.out.print(prompt);
		System.out.flush();
		
		try {
			return stdin.readLine();
		} catch (Exception e) {
			return "Error: " + e.getMessage();
		}
	
	}

}

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