There is absolutely no problem with the SSD 3 Java program exercise 7. We have run it, passed the exam, and the teacher gives full marks

Packet : 57578852exercise7.zip filelist
Exercise 7/
Exercise 7/.classpath
Exercise 7/.project
Exercise 7/bin/
Exercise 7/bin/Catalog.class
Exercise 7/bin/catalog.dat
Exercise 7/bin/CatalogGUI$CatalogListListener.class
Exercise 7/bin/CatalogGUI.class
Exercise 7/bin/CatalogLoader.class
Exercise 7/bin/Coffee.class
Exercise 7/bin/CoffeeBrewer.class
Exercise 7/bin/DataField.class
Exercise 7/bin/DataFormatException.class
Exercise 7/bin/FileCatalogLoader.class
Exercise 7/bin/Product.class
Exercise 7/catalog.dat
Exercise 7/src/
Exercise 7/src/CatalogGUI.java
Exercise 7/src/Coffee.java
Exercise 7/src/CoffeeBrewer.java
Exercise 7/src/Product.java

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