Design Patterns

Question 1

Patterns

Answer 1

A general reusable solution to a commonly occurring problem within a given context in software design.

A template, not a finished design.

Question 2

Benefits of using a pattern

Answer 2

Industry Standard Approach
Reusability
Easy to understand and debug
Saves time/cost

Question 3

Idioms

Answer 3

an expression of a simple task, algorithm, or data structure that is not a built-in feature in the programming language being used,

Question 4

VarArgs

Answer 4

You need to pass in many instances of the same object type to a method, but you don’t know at compile time how many instances there will be.

for(String s : str)

Question 5

Creational Patterns

Answer 5

about class instantiation or object creation

Question 6

Structural Patterns

Answer 6

organising different classes or objects to create bigger structures and provide new functionality

Question 7

Behavioural Patterns

Answer 7

identifying common communication patterns between objects and identifying this pattern