Mittwoch lesson

Code/Steiner/paymentSystemWithInterfaces/.vscode/settings.json

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+{
+    "java.project.sourcePaths": ["src"],
+    "java.project.outputPath": "bin",
+    "java.project.referencedLibraries": [
+        "lib/**/*.jar"
+    ]
+}

Code/Steiner/paymentSystemWithInterfaces/README.md

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+## Getting Started
+
+Welcome to the VS Code Java world. Here is a guideline to help you get started to write Java code in Visual Studio Code.
+
+## Folder Structure
+
+The workspace contains two folders by default, where:
+
+- `src`: the folder to maintain sources
+- `lib`: the folder to maintain dependencies
+
+Meanwhile, the compiled output files will be generated in the `bin` folder by default.
+
+> If you want to customize the folder structure, open `.vscode/settings.json` and update the related settings there.
+
+## Dependency Management
+
+The `JAVA PROJECTS` view allows you to manage your dependencies. More details can be found [here](https://github.com/microsoft/vscode-java-dependency#manage-dependencies).

Code/Steiner/paymentSystemWithInterfaces/src/App.java

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+public class App {
+
+    public static void main(String[] args) throws Exception {
+
+        Payment creditCard = new CreditCardPayment("1234-5678-9012-3456", "Max Mustermann");
+
+        Payment paypal = new PayPalPayment("max@example.com");
+
+        Payment bankTransfer = new BankTransferPayment("DE89 3704 0044 0532 0130 00");
+
+        processPayment(creditCard, 49.99);
+
+        processPayment(paypal, 19.99);
+
+        processPayment(bankTransfer, 99.99);
+
+    }
+
+    public static void processPayment(Payment payment, double amount) {
+        payment.pay(amount);
+
+    }
+
+}

Code/Steiner/paymentSystemWithInterfaces/src/BankTransferPayment.java

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+public class BankTransferPayment extends Payment implements IPay {
+    String securityNumber;
+
+    public BankTransferPayment(String securityNumber) {
+        this.securityNumber = securityNumber;
+    }
+
+    @Override
+    public void pay(double amount) {
+        System.out.println("Bezahlung von " + amount + " CHF mit Banktransfer " + securityNumber);
+    }
+}

Code/Steiner/paymentSystemWithInterfaces/src/CreditCardPayment.java

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+public class CreditCardPayment extends Payment implements IPay {
+    String number;
+    String name;
+
+    public CreditCardPayment(String number, String name) {
+        this.number = number;
+        this.name = name;
+    }
+
+    @Override
+    public void pay(double amount) {
+        System.out.println("Bezahlung von " + amount + " CHF mit Kreditkarte " + number + " von " + name);
+    }
+}

Code/Steiner/paymentSystemWithInterfaces/src/IPay.java

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+public interface IPay {
+    public void pay(double amount);
+}

Code/Steiner/paymentSystemWithInterfaces/src/PayPalPayment.java

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+public class PayPalPayment extends Payment implements IPay {
+    String mail;
+
+    public PayPalPayment(String mail) {
+        this.mail = mail;
+    }
+
+    @Override
+    public void pay(double amount) {
+        System.out.println("Bezahlung von " + amount + " CHF mit Kreditkarte " + mail);
+    }
+}

Code/Steiner/paymentSystemWithInterfaces/src/Payment.java

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+public abstract class Payment implements IPay {
+    public abstract void pay(double amount);
+}