Java

Java

1. Constructor

   • Aufgabe: Create an instance of a class
   • Return Types
     • None! Note even "Void"

2. Methods

   • Aufgabe: execute Java Code
   • Return Types
     • Any and none (void)

3. Object

   • The term ‘object’, however, refers to an actual instance of a class. Every object must belong to a class. Objects are created and eventually destroyed – so they only live in the program for a limited time. While objects are ‘living’ their properties may also be changed signficantly. An example will help clarify what we’ve said. Suppose we have a class called ‘Animal’. All Animals have bodies and brains. So, this general ‘template’ of an Animal does not change. An instance of the Animal class would be a specific animal – like a lion, a cat, or a zebra. These instances of the Animal class would be called objects. Whereas the Animal class is a general concept, the instances of that class – the lions, cats, etc – take that general concept and create a real instance of it.

4. Class

   • The term ‘class’ refers to the actual written piece of code in which the class is defined. A class is a static piece of code that consists of attributes which don’t change during the execution of a program – like the method definitions within a class.

5. API (Application programming interface)

   • An application programming interface (API) specifies how some software components should interact with each other.
   • Ohne Titel
   • Implementation
     • Objekte werden implementiert

6. instance Variables

   • private String name
     • In this case you are neither adding the name to a list, nor are you assigning a particular value to the string. All you are doing is declaring the name of the String object variable.

7. Local Variables

   • "Verschwinden, wenn Methode abgeschlossen" (Kurzzeitgedächtnis)

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