feat: ex2 serie2 finished

serie2/ex2/.gitignore

+*.class

serie2/ex2/Account.java

+public class Account {
+
+    private String owner;
+    private int amount;
+
+    public String getOwner() {
+        return owner;
+    }
+
+    public int getAmount() {
+        return amount;
+    }
+
+    public Account(String owner) {
+        this.owner = owner;
+    }
+
+    public Account(String owner, int amount) {
+        this(owner);
+        amountAuthorizedCreation(amount);
+        this.amount = amount;
+    }
+
+    public static void amountAuthorizedCreation(int amount) {
+        if (amount < 0) {
+            throw new RuntimeException("Amount has to be greater than or equal to 0.-");
+        }
+    }
+
+    public static void amountAuthorizedOperations(int amount) {
+        if (amount <= -2000) {
+            throw new RuntimeException("Amount has to be greater than or equal to -2000.-");
+        }
+    }
+
+    public void withdraw(int amountToRetrieve) {
+        amountAuthorizedOperations(this.amount - amountToRetrieve);
+        this.amount -= amountToRetrieve;
+    }
+
+    public void deposit(int addAmount) {
+        amountAuthorizedOperations(this.amount + addAmount);
+        this.amount += addAmount;
+    }
+
+    public void transfer(int amount, Account dst) {
+        dst.deposit(amount);
+        withdraw(amount);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        return (obj instanceof Account) && (((Account) obj).getOwner() == this.owner)
+                && (((Account) obj).getAmount() == this.amount);
+    }
+
+    public static void main(String[] args) {
+        Account p1 = new Account("Person 1", 100);
+        Account p2 = new Account("Person 2", 100);
+
+        p1.transfer(2101, p2);
+
+        System.out.println(p1.getAmount());
+    }
+}