MykolaBova

public class ClonePerson {
 
    private String name;
 
    public ClonePerson(String name) {
        this.name = name;
    }
 
    public String getName() {
        return name;

MykolaBova

public class ClonePerson1 implements Cloneable{
 
    private String name;
 
    public ClonePerson1(String name) {
        this.name = name;
    }
 
    public String getName() {
        return name;

MykolaBova

import java.util.Date;

public class ClonePerson2 implements Cloneable{
 
    private String name;
    private Date dob;
 
    public ClonePerson2(String name, Date dob) {
        this.name = name;
        this.dob = dob;

MykolaBova

import junit.framework.*;

final class LazySingleton {
	private int i;
    private static class LazySingletonLoader {
        private static final LazySingleton INSTANCE = new LazySingleton();
    }
    private LazySingleton() {
        if (LazySingletonLoader.INSTANCE != null) {
            throw new IllegalStateException("Already instantiated");

MykolaBova

import java.util.HashMap;
import java.util.Map;

public class FooMultiton {
    private static final Map<Object, FooMultiton> instances = new HashMap<Object, FooMultiton>();
 
    private FooMultiton() {
        // no explicit implementation
    }
 

MykolaBova

// Single-threaded version
public class DoubleCheckedLocking {
    private Helper helper;
    public Helper getHelper() {
        if (helper == null) {
            helper = new Helper();
        }
        return helper;
    }
 

MykolaBova

package myjavaprogram;
import java.util.Arrays;

public class TestClass1 {
    public static void main(String[] args){
        int[] array = {23, 23, 0, 43, 545, 12, -55, 43, 12, 12, -999, -87, 12, 0, 0};
        //int[] array = {23, -22, 0, 43, 545, 12, -55, 43, 12, 0, -999, -87, 12};
        //int[] array = {23, -22, 0, 23};
        //int[] array = {23, -22, 23};
        calculate_duplicates(array);        

MykolaBova

class HideInstanceVariable {
    public static void main(String[] args) {
        Car car = new SportCar();
        System.out.println(car.getSpeedMax());
    }
}

class Car {
    private int speedMax = 150;

MykolaBova

class Main {
    public static void main(String[] args) {
        Car car = new SportCar();
        System.out.println(car.getSpeedMax());
    }
}

class Car {
    private int speedMax = 150;

MykolaBova

class Overriding {
    public static void main(String[] args) {
        Car car = new SportCar();
        System.out.println(car.getSpeedMax());
    }
}

class Car {
    protected int speedMax = 150;