BerkeSoysal

class Solution {
    public boolean equationsPossible(String[] equations) {
        HashMap<Character, ArrayList<Character>> equalGraph = new HashMap<>();
            
        for(String equation: equations)
        {
            if(equation.charAt(1)=='=')
            {
                Character var1 = equation.charAt(0);  
                Character var2 = equation.charAt(3);

BerkeSoysal

import org.junit.Test;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import static org.junit.Assert.assertTrue;

public class Program {

BerkeSoysal

class Solution {
   public int evalRPN(String[] tokens) {
        Stack<Integer> stack = new Stack<>();
        for(String s: tokens)
        {
            if(s.matches("-?\\d+"))
            {
                stack.push(Integer.valueOf(s));
            }
            else

BerkeSoysal

package berke;

import java.util.*;

public class Main
{
    private static Boolean found = false;
    private static Double answer = -1d;

    // "static void main" must be defined in a public class.

BerkeSoysal

public class PasswordService
{
    private PasswordHasher passwordHasher;
    
    public PasswordService(PasswordHasher passwordHasher)
    {
        this.passwordHasher = passwordHasher;
    }
    
    void hashPassword(String password)

BerkeSoysal

public class PasswordService
{
    private Base64Hasher hasher = new Base64Hasher();
    void hashPassword(String password)
    {
        hasher.hashPassword(password);
    }
}

BerkeSoysal

public abstract class Hashed
{
    PasswordHasher passwordHasher;
    String hash;
    
    public void generateHash(String password)
    {
        hash = passwordHasher.hashPassword(password);
    }
}

BerkeSoysal

public class Base64 extends Hashed
{
    public Base64()
    {
        this.passwordHasher = new Base64Hasher();
    }
}

BerkeSoysal

public abstract class Hashed
{
    PasswordHasher passwordHasher;
    String hash;
    abstract void generateHash(String password);
}

BerkeSoysal

public class UnHashed implements PasswordHasher
{
    @Override
    public String hashPassword(String password)
    {
        return password;
    }
}