first commit

.gitignore

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+/target
+/.settings
+/.idea/
+.project
+.classpath
+*.iml

README.md

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+Bank account kata
+=================
+
+Think of your personal bank account experience
+When in doubt, go for the simplest solution
+
+Requirements
+------------
+
+* Deposit and Withdrawal
+* Transfer
+* Account statement (date, amount, balance)
+* Statement printing
+* Statement filters (just deposits, withdrawal, date)
+
+Statement should have transactions in the following format:
+
+```
+  DATE       | AMOUNT  | BALANCE
+  10/04/2014 | 500.00  | 1400.00
+  02/04/2014 | -100.00 | 900.00
+  01/04/2014 | 1000.00 | 1000.00
+```
+
+
+The Rules
+---------
+
+1. One level of indentation per method
+2. Don’t use the 'else' keyword
+3. Wrap all primitives and Strings
+4. First class collections
+5. One dot per line
+6. Don’t abbreviate
+7. Keep all entities small (50 lines)
+8. No classes with more than two instance variables
+9. No getters/setters/properties
+
+
+Implementation Guidelines
+=========================
+
+**Note:** Start with an acceptance test through the Account class:
+
+    public class Account {
+
+        public void deposit(int amount);
+
+        public void withdraw(int amount);
+
+        public void printStatement();
+    }
+
+You are not allowed to add any other methods to that class
+
+#### For more information:
+
+-  [Object Calisthenics pdf](http://www.cs.helsinki.fi/u/luontola/tdd-2009/ext/ObjectCalisthenics.pdf)
+-  Object Calisthenics (full book), Jeff Bay in: The ThoughtWorks Anthology.
+   Pragmatic Bookshelf 2008
+-  Original idea for the kata: [How Object-Oriented Are You Feeling Today?](https://www.slideshare.net/KrzysztofJelski/how-object-oriented-are-you-feeling-today) - Krzysztof Jelski (Session on the Software Craftsmanship UK 2011 conference)
+- sample solution: [https://github.com/sandromancuso/Bank-kata.git](https://github.com/sandromancuso/Bank-kata.git)

pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<groupId>com.pragmatists</groupId>
+	<artifactId>bank-kata</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>bank-kata</name>
+
+	<properties>
+		<java.version>1.9</java.version>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.junit.jupiter</groupId>
+			<artifactId>junit-jupiter</artifactId>
+			<version>5.6.2</version>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.assertj</groupId>
+			<artifactId>assertj-core</artifactId>
+			<version>3.17.2</version>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.jbehave</groupId>
+			<artifactId>jbehave-core</artifactId>
+			<version>4.1</version>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.mockito</groupId>
+			<artifactId>mockito-junit-jupiter</artifactId>
+			<version>3.4.0</version>
+			<scope>test</scope>
+		</dependency>
+
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<artifactId>maven-compiler-plugin</artifactId>
+				<configuration>
+					<source>${java.version}</source>
+					<target>${java.version}</target>
+				</configuration>
+			</plugin>
+
+		</plugins>
+	</build>
+</project>

src/main/java/com/pragmatists/bank/Printable.java

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+package com.pragmatists.bank;
+
+public class Printable {
+
+    private String value = "";
+
+    public void println(String line){
+        value += line + '\n';
+    }
+
+    public void println(StringBuilder builder) {
+        println(builder.toString());
+    }
+
+    public String getValue() {
+        return value;
+    }
+
+    public void printWith(java.io.PrintStream out) {
+        out.print(value);
+    }
+}

src/main/java/com/pragmatists/bank/StartApp.java

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+package com.pragmatists.bank;
+
+import com.pragmatists.bank.domain.Account;
+import com.pragmatists.bank.domain.Amount;
+import com.pragmatists.bank.domain.Statement;
+
+import java.time.LocalDate;
+
+import static com.pragmatists.bank.domain.Amount.amountOf;
+
+public class StartApp {
+
+    public static void main(String[] args) {
+        Account account = new Account(new Statement());
+        Printable printer = new Printable();
+
+        account.deposit(amountOf(1000), LocalDate.of(2012, 1, 10));
+        account.deposit(amountOf(2000), LocalDate.of(2012, 1, 12));
+        account.withdrawal(Amount.amountOf(500), LocalDate.of(2012, 1, 14));
+
+        account.printStatement(printer);
+
+        printer.printWith(System.out);
+    }
+
+}

src/main/java/com/pragmatists/bank/domain/Account.java

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+package com.pragmatists.bank.domain;
+
+import com.pragmatists.bank.Printable;
+
+import java.time.LocalDate;
+
+import static com.pragmatists.bank.domain.Amount.amountOf;
+
+
+public class Account {
+
+	private Statement statement;
+
+	private Amount balance = amountOf(0);
+
+	public Account(Statement statement) {
+		this.statement = statement;
+	}
+
+	public void deposit(Amount value, LocalDate date) {
+		recordTransaction(value, date);
+	}
+
+	public void withdrawal(Amount value, LocalDate date) {
+		recordTransaction(value.negative(), date);
+	}
+
+	public void printStatement(Printable printer) {
+		statement.printTo(printer);
+	}
+
+	private void recordTransaction(Amount value, LocalDate date) {
+		Transaction transaction = new Transaction(value, date);
+		Amount balanceAfterTransaction = transaction.balanceAfterTransaction(balance);
+		balance = balanceAfterTransaction;
+		statement.addLineContaining(transaction, balanceAfterTransaction);
+	}
+
+}

src/main/java/com/pragmatists/bank/domain/Amount.java

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+package com.pragmatists.bank.domain;
+
+import java.text.DecimalFormat;
+
+public class Amount {
+
+	private DecimalFormat decimalFormat = new DecimalFormat("#.00");
+
+	private int value;
+
+	public Amount(int value) {
+		this.value = value;
+	}
+
+	public static Amount amountOf(int value) {
+		return new Amount(value);
+	}
+
+	public Amount plus(Amount otherAmount) {
+		return amountOf(this.value + otherAmount.value);
+	}
+
+	public boolean isGreaterThan(Amount otherAmount) {
+		return this.value > otherAmount.value;
+	}
+
+	public Amount absoluteValue() {
+		return amountOf(Math.abs(value));
+	}
+
+	public String moneyRepresentation() {
+		return decimalFormat.format(value);
+	}
+
+	public Amount negative() {
+		return amountOf(-value);
+	}
+
+	@Override
+	public boolean equals(Object obj) {
+		Amount other = (Amount) obj;
+		if (value != other.value)
+			return false;
+		return true;
+	}
+
+}

src/main/java/com/pragmatists/bank/domain/Statement.java

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+package com.pragmatists.bank.domain;
+
+import com.pragmatists.bank.Printable;
+
+import java.util.LinkedList;
+import java.util.List;
+
+public class Statement {
+
+    private static final int TOP_OF_THE_LIST = 0;
+
+    public static final String STATEMENT_HEADER = "date       | credit   | debit    | balance";
+
+    private final List<StatementLine> statementLines = new LinkedList<StatementLine>();
+
+    public void addLineContaining(Transaction transaction, Amount currentBalance) {
+        statementLines.add(TOP_OF_THE_LIST, new StatementLine(transaction, currentBalance));
+    }
+
+    public void printTo(Printable printer) {
+        printer.println(STATEMENT_HEADER);
+        printStatementLines(printer);
+    }
+
+    private void printStatementLines(Printable printer) {
+        for (StatementLine statementLine : statementLines) {
+            statementLine.printTo(printer);
+        }
+    }
+
+}

src/main/java/com/pragmatists/bank/domain/StatementLine.java

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+package com.pragmatists.bank.domain;
+
+import com.pragmatists.bank.Printable;
+
+public class StatementLine {
+
+    private Transaction transaction;
+    private Amount currentBalance;
+
+    public StatementLine(Transaction transaction, Amount currentBalance) {
+        this.transaction = transaction;
+        this.currentBalance = currentBalance;
+    }
+
+    public void printTo(Printable printer) {
+        this.transaction.printTo(printer, currentBalance);
+    }
+
+}