Java Misc Flashcards
1
Q
What is SAM?
A
Single Abstract Method
A functional interface facilitating use of lambdas
2
Q
What does Java do with a class that has no constructor declared?
A
The compiler automatically provides a public, no-argument constructor called the default constructor
3
Q
For a class to represent a POJO it must not (3)…
A
Extend a prespecified class Implement a prespecified interface Contain prespecified annotations
Essentially, a POJO defines an entity
4
Q
What is a Java Bean?
A
A POJO with some special restrictions, such as:
Must be Serializable
Fields are private - accessed by getters and setters only
5
Q
What is the effect of the Serializable annotation?
A
Converts the state of an object into a bytestream - useful for I/O
6
Q
What does the static keyword signify?
A
It is applied to members which belong to a type rather than an instance of the type
