complete

src/javaoofund/sandwich/Main.java

@@ -0,0 +1,49 @@
+package javaoofund.sandwich;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Main {
+
+	/**
+	 * @param args
+	 */
+	public static void main(String[] args) {
+		Sandwich usa 	= new Sandwich("U.S.A.", 300);
+		Sandwich cheese = new Sandwich("Cheese", 350);
+		Sandwich ham 	= new Sandwich("Ham", 300);
+
+		Supplement salad = new Supplement("Salad");
+		Supplement tomato = new Supplement("Tomato");
+		Supplement egg = new Supplement("Egg");
+		Supplement corn = new Supplement("Corn");
+
+		usa.getComponents().add(salad);
+		usa.getComponents().add(tomato);
+		cheese.getComponents().add(corn);
+		cheese.getComponents().add(tomato);
+		ham.getComponents().add(egg);	
+		ham.getComponents().add(corn);
+
+		Worker marty = new Worker("Marty", 500);
+		Worker biff = new Worker("Biff", 1200);
+
+		marty.purchase(usa);
+		//marty.purchase(cheese);
+
+		biff.purchase(ham);
+		biff.purchase(cheese);
+		//biff.purchase(usa);
+
+
+		List<Sandwich> sandwiches = new ArrayList<Sandwich>();
+		sandwiches.add(usa);
+		sandwiches.add(cheese);
+		sandwiches.add(ham);
+
+		for(Sandwich s: sandwiches){
+			System.out.println(s);
+		}
+	}
+
+}

src/javaoofund/sandwich/Sandwich.java

@@ -1,20 +1,55 @@
 package javaoofund.sandwich;
 
+import java.sql.Array;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
 import java.util.List;
+import java.util.Map;
 
 public class Sandwich {
 
 	private String name;
-	private List<String> components;
+	private List<Supplement> components;
 	private int price;
 
+	private Worker owner;
+
 	public Sandwich(String name, int price) {
 		super();
 		this.name = name;
 		this.price = price;
+
+		this.components = new ArrayList<Supplement>();
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public List<Supplement> getComponents() {
+		return components;
+	}
+
+	public int getPrice() {
+		return price;
+	}
+
+	public Worker getOwner() {
+		return owner;
+	}
+
+	public void setOwner(Worker worker) {
+		this.owner = worker;		
+	}
+
+	@Override
+	public String toString() {
+		return "Sandwich [name=" + name + ", supplement=" + components
+				+ ", price=" + price + ", owner=" + owner + "]";
 	} 
 
-	public boolean addComponents(String component){
-		return components.contains(component)? false: components.add(component)&&true;
-	}
+
+
+
 }

src/javaoofund/sandwich/Supplement.java

@@ -0,0 +1,17 @@
+package javaoofund.sandwich;
+
+public class Supplement {
+
+	private String name;
+
+	public Supplement(String name) {
+		super();
+		this.name = name;
+	}
+
+	@Override
+	public String toString() {
+		return "Supplement [name=" + name + "]";
+	}
+
+}

src/javaoofund/sandwich/Worker.java

@@ -1,25 +1,56 @@
 package javaoofund.sandwich;
 
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * 
+ * @author alex
+ * @version 0.1
+ */
 public class Worker {
-	
+
 	private String name;
 	private int money;
-
-
+	private List<Sandwich> sandwiches;
+
+	public List<Sandwich> getSandwiches() {
+		return sandwiches;
+	}
+
 	public Worker(String name, int money) {
 		super();
 		this.name = name;
 		this.money = money;
+		this.sandwiches = new ArrayList<Sandwich>();
 	}
-	
+
 	public String getName() {
 		return name;
 	}
+
 	public int getMoney() {
 		return money;
 	}
-
-	public  void purchase(){
-
+
+	public void purchase(Sandwich s) {
+
+		if ((s != null) && (s.getOwner() != null)) {
+			throw new RuntimeException(
+					"Sandwich is already owned by another Worker");
+		}
+
+		if (this.money - s.getPrice() < 0) {
+			throw new RuntimeException("Budget ist to low!");
+		}
+
+		this.sandwiches.add(s);
+		s.setOwner(this);
+		this.money -= s.getPrice();
+	}
+
+	@Override
+	public String toString() {
+		return "Worker [name=" + name + "]";
 	}
 }