SDA Lab Quiz 3 A & B

What is the primary purpose of the Singleton pattern?

• To ensure a class has only one instance and provide a global point of access to it
  

• To inherit behavior from multiple classes

• To instantiate multiple objects of the same type

• To allow runtime object creation with different types

Singleton s1 = Singleton.getInstance();

Singleton s2 = Singleton.getInstance();

System.out.println(s1 == s2);

• true

• false

• Runtime Error

• Compilation Error

What is the Factory Method pattern mainly used for?

• To enforce inheritance

• To allow the creation of objects without specifying their concrete classes

• To create a single global object

• To serialize objects

Which of the following best explains the advantage of Factory Method over direct object instantiation?

• Reduces memory consumption

• Increases tight coupling

• Avoids constructors

• Provides flexibility in object creation

What will be the output of the following code?

(Factory Method)

• Woof

• Meow

• Runtime Error

• None of these

What is the main goal of the Composite design pattern?

• To simplify condition checking

• To treat individual and composite objects uniformly

• To avoid using inheritance

• To optimize recursion

Folder
└── File

Which pattern does this represent?

• Singleton

• Builder

• Composite

• Factory Method

Fill the missing part.

• return new Singleton();
  

• instance = new Singleton();
  

• instance.getInstance();

• Singleton();

FIll the missing part.

• components.put(c);
  

• components.append(c);
  

• components.add(c);
  

• components.insert(c);

What should be done in given scenario?

• Singleton();
  

• Singleton.getInstance();
  

• new Singleton();
  

• create Singleton();