Which is type of Singleton allows intance is loaded into memory when calling method getInstance() ?

• Double Check Locking
• Thread Safe
• Bill Pugh
• Lazy Initialization

Which of the following statements is true about Sequence Diagrams?

• Each message is represented by an arrow between the lifelines of two objects
• Each message is represented by a dashed vertical line
• Each message must be related to two distinct objects
• A&C

What is different between Template Method pattern and Strategy pattern?

• Template Method pattern is compile-time algorithm selection, Strategy pattern is run-time algorithm selection.
• Template Method pattern is run-time algorithm selection, Strategy pattern is compile-time algorithm selection.
• Both of them is run-time algorithm selection. But algorithm in Template Method has independent relationship, algorithm in Strategy has constraint relationship
• Both of them is compile-time algorithm selection. But algorithm in Template Method has constraint relationship, algorithm in Strategy has independent relationship

Which of these type parameters is used for a generic methods to return and accept any type of object?

• K
• N
• T
• V

……………. controls life cycle of activities and manages activity stack level requirements

• Windows Manager
• Content Provider
• Activity Manager

The difference between actors and objects of the same name is

• Actor is outside and object is inside the system
• Objects are outside and actors are inside the system
• Objects have behavior and actors have no behavior
• Actor has behavior and object has no behavior

It is used in the following cases:

- When we want to represent a partial or full hierarchy of objects.

- In case we need to add the responsibilities dynamically to the individual object without affecting other objects.

What it is?

• Composite pattern
• Decorator pattern
• Template pattern
• State pattern

Using quick sort is a stable way of sorting

• true
• false

What is true about threading?

• run() method calls start() method and runs the code
• run() method creates new thread
• run() method can be called directly without start() method being called
• start() method creates new thread and calls code written in run() method

getExternalFilesDir( ) method is used to get the directory of the external storage.

• true
• true