changed the file structure

Code/Steiner/oopUebung7/.vscode/settings.json

@@ -0,0 +1,7 @@
+{
+    "java.project.sourcePaths": ["src"],
+    "java.project.outputPath": "bin",
+    "java.project.referencedLibraries": [
+        "lib/**/*.jar"
+    ]
+}

Code/Steiner/oopUebung7/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/oopUebung7/src/App.java

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+public class App {
+    public static void main(String[] args) throws Exception {
+        Person myPerson1 = new Person("Hans", 200);
+        myPerson1.validTransaction(500);
+        System.out.println(myPerson1.getBalance());
+        myPerson1.setName("Luca");
+        System.out.println(myPerson1.getName());
+    }
+}

Code/Steiner/oopUebung7/src/Person.java

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+public class Person {
+    private String name;
+    private double balance;
+
+    Person(String person, double money) {
+        name = person;
+        balance = money;
+    }
+
+    boolean validTransaction(double money) {
+        if (balance + money >= 0) {
+            balance += money;
+            return true;
+        } else
+            return false;
+    }
+
+    void setName(String name) {
+        this.name = name;
+    }
+
+    String getName() {
+        return name;
+    }
+
+    double getBalance() {
+        return balance;
+    }
+}