Object Interaction Part 1

Question 1

Abstraction

Answer 1

The ability to ignore details of parts, to focus attention on a higher level of a problem

Question 2

Modularization

Answer 2

The process of dividing a whole into well-defined parts that can be built and examined separately and that interact in defined ways

Question 3

Class diagram

Answer 3

Diagram that shows the classes of an application and the relationships between them. It gives them information about the source code and presents the static view of a program.

Question 4

Object Diagram

Answer 4

Diagram that shows the objects and their relationships at one moment in time during the execution of an application. It gives information about objects at runtime and presents the dynamic view of a program

Question 5

Object reference

Answer 5

A link to an object. Can be stored in a variable with an appropriate object type

Question 6

Object type

Answer 6

A type that refers to an object. Eg a type String that refers to a String object

Question 7

Primitive type

Answer 7

In Java, a non-object type such as int, boolean, char, double and long. Types of this kind have no methods.

Question 8

Logic Operator

Answer 8

Operator that acts on boolean values (try or false) and produces a new boolean value as a result. Eg include && (and), || (or, and ! (not)

Question 9

Concatenation

Answer 9

Joining two String objects into one. In Java, this is done with a + sign. Eg “Java” + “with BlueJ” yields “Javawith BlueJ”

Question 10

Modulo operator

Answer 10

Operator (%) that returns the remainder of division between two integers. Eg 7 % 2 returns 1