12786293
| Question | Answer |
| Software Engineering | Well-written code that can be understood and edited by others for maintenance that includes a clear code and good comments |
| Compiler vs Interpreter | Compiler translates code in machine code Interpreter translates into intermediate language |
| Term | Everything that can either hold or produce a value (variable, method, constant, paranthesized expression) |
| Assigment | Assigns a value: The variable on the left will become whatever value is represented on the right |
| expression statements | Expression: Everything with an operator and operands Expression statement: Add a semicolon to the end of the expression |
| Scope | The visibility of the variable. local variables are only visible inside the block statement they were declared in. |
| Dangling Else Problem | When encapsulating of if statements without breakets, it leaves confusion which else belongs to which if clause |
| Method | A sequence of statements that are inside a blockstatement and have a name to be able to call it. May need parameters and may return something. Defined for a class. |
| 4 things the class body contains | Methods, constructer, instance variables, constants |
| lokal variables instance variables class variables | 1. local to the method 2. associated with the object 3. associated with class |
| Was bedeuten &, |, ~ , ˆ für Integers? | This are bitwise operations: bitwise AND bitwise OR NOT XOR |
| recrusion | A method using itself to solve a problem |
| Character arithmetic | Character in Unicode representation |
| Debugging Strategie | Debugger, Unit test, assertions, println |
| Exception handling | With the try/ catch block |
| Difference between an object and class | Class: A collection on methods and a constructor to create objects, which are instances of the class |
| Array declaration | type[] identifier = new type[ length ]; |
| Properties of an array | Homogenous (all elements have to have the same type of data) and ordered |
| Regions of memory | Stack: local variables, references to the heap, parameter Heap: Objects, instance variables static: static data, program code, constants |
| Expression evaluation | 1. Precedence 2. Associativity 3. Direction (Left to right) |
| MVC Pattern | Model, View, Contoller: The User inputs data through the Controller and seees output through View. |
| Assertion use | Only for programmer not for user input. Exceptions control user input |
| Java Collections Framework 3 data structures | 1. Lists 2. Sets 3. Maps |
| Programming errors | Syntax and Bugs |
| Class hierarchy | You can extend a superclass. The subclass inherrites all the methods and constructors from its superclass |
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