Quiz Android 10

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

• K
• N
• T
• V

What is the difference between HashMap and Hashtable?

• HashMap is NOT synchronized. Hashtable is synchronized.
• HashMap is synchronized . Hashtable is NOT synchronized.
• HashMap cannot contain any null keys or null values. Hashtable can contain one null key and multiple null values.
• HashMap can contain one null key and multiple null values. Hashtable cannot contain any null keys or null values.

Which of these class is related to all the exceptions that can be caught by using catch?

• Error
• Exception
• RuntimeExecption
• All of the mentioned

What is different between DataBinding and FindViewById method?

• DataBinding generate binding class at runtime and findViewById run at compile time.
• DataBinding generate binding class at compile time and findViewById run at runtime.
• DataBinding and findViewById run at compile time.
• DataBinding and findViewById run at runtime

Hilt is integrated with Jetpack libraries, Android framework classes, and automatically generates and provides all of the following except ______?

• Components for Android framework classes
• Manual management of Android class lifecycles
• Scope annotations
• Predefined bindings and qualifiers

What is the difference between const and val?

• The keywords const and val are used to declare an immutable property (read-only properties).
• const is also known as Compile-time constant. So, no runtime assignment of values is allowed in const variables. So, you can't assign a const variable to a function or to some class. And the val properties can be initialised at the runtime. So, you can assign a val variable to a function or to some class
• const only can be used for number like Integer, Long, float. Val can use for all type.

Which of the following will directly stop the execution of a Thread?

• notify()
• notifyall()
• exits synchronized code
• wait()

Which of the following will not directly cause a thread to stop?

• wait()
• notify()
• InputStream access
• sleep()

The lifeline of an object is shown in the diagram

• Object Diagram
• State diagram
• Sequence Diagram
• Use case diagram

The relationship between class A and class B is

• Dependency

• Realization

• Composition

• Aggregation