wsadrak

import java.util.Arrays;

public class MyArrayList {
	private Object[] arrayList = new Object[1];
	private int emptyPlace = 0;

	public void add(Object object) {
		if (emptyPlace == arrayList.length) {
			arrayList = Arrays.copyOf(arrayList, arrayList.length * 2);
		}

wsadrak

public class PrimeNumbers {
	public static void main(String[] args) {

		System.out.println("Is 17 prime number? " + isPrimeNumber(17));
		System.out.println("Is 19 prime number? " + isPrimeNumber(19));
		System.out.println("Is 15 prime number? " + isPrimeNumber(15));
		
	}

wsadrak

public class SumOfPrimeNumbers {

	private static final int START_VALUE = 2;
	private static final int HOW_MANY_PRIME_NUMBERS = 1000;

	public static void main(String[] args) {

		int currentValue = START_VALUE;
		int primeNumbersCounter = 0;
		int sumOfPrimeNumbers = 0;

wsadrak

import java.util.Scanner;

public class MultiplicationTable {
	public static void main(String[] args) {
		int size = readValueFromUser();
		generateTable(size);
	}

	private static int readValueFromUser() {
		System.out.println("Please type a size of multiplication table: ");

wsadrak

import java.util.Scanner;

public class PrimeNumbers {
	private static final int START_VALUE = 2;

	public static void main(String[] args) {
		int n = readValueFromUser();
		printPrimeNumbers(n);
	}

wsadrak

import java.util.Scanner;

public class Factorial {

	public static void main(String[] args) {
		int factArg = readValueFromUser();
		int result = calculateFactorial(factArg);
		System.out.println("Factorial " + factArg + " = " + result);
	}

wsadrak

public class LeapYear {
	private static final int LEAP_YEAR_CONDITION_VALUE = 4;
	private static final int LEAP_YEAR_CONDITION_VALUE_2 = 100;
	private static final int LEAP_YEAR_CONDITION_VALUE_3 = 400;

	public static void main(String[] args) {
		int year = readYearFromUser();

		if (isLeapYear(year)) {
			System.out.println(year + " - is leap year");

wsadrak

import java.util.Scanner;

public class FloydsTriangle {
	public static void main(String[] args) {

		int howManyRows = readRowsFromUser();
		printFloydsTriangle(howManyRows);

	}

wsadrak

import java.util.Map;
import java.util.TreeMap;

public class Main {
	public static void main(String[] args) {
		String word1 = "Philadelhpia";
		String word2 = "Spring Framework";
		String word3 = "InputMismatchException";

		findAndPrintDuplicates(word1);

wsadrak

import java.util.Scanner;

public class PerfectNumber {
	public static void main(String[] args) {
		int value = readValueFromUser();
		isPerfectValue(value);
	}

	private static int readValueFromUser() {
		System.out.println("Type a value to check: ");