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Java 8 lambda expression | okay java | Lambda expression Interview Questions | Java 8 Features
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Java 8 lambda expression | okay java | Lambda expression Interview Questions | Java 8 Features
Q.What is Lambda expression ?
A lambda expression is an anonymous (nameless) function
function without name, without return type and without access modifier.
Lambda exp/function doesn’t belong to any class
provides a clear and concise way to write code
We use lambda exp to provide implementation to the method of a functional interface (user defined or build-in/predefined )
Functional interface provides reference to the lambda exp.
Lambda exp Syntax
(parameter_list) arrow sign/lambda sign/LS {function_body}
Zero Parameters
One Parameter
() is optional is for a single parameters.
Multiple Parameters
Lambda exp Optional
Optional type declaration :
No need to declare the type of a parameter. The compiler can inference the same from the value of the parameter
Optional parenthesis around parameter :
No need to declare a single parameter in parenthesis. For multiple parameters, parentheses are required
Optional curly braces :
No need to use curly braces in expression if the body contains a single statement
Optional return keyword :
The compiler automatically returns the value if the body has a single expression to return the value.
Curly braces are required to indicate that expression returns a value
Variable Scope in Lambda exp :
Lambda expression is capable of accessing variables declared outside the lambda function body
Local variables : declared with in the method itself
Instance variables : declared outside of the method / class level variables
Static variables : declared using ‘static’ keyword
What is final variable or effectively final variable ?
1. Java 8 new features
2. Java 8 functional interface part
3. Java 8 functional interface coding
4. Functional Interface prior to Java 8
5. Default methods in interface
6. Default methods Diamond Problem in java 8
7. Java 8 lambda expression
8. Lambda expression variable scope interview questions
9. Java 8 predicate functional Interface
10. Java 8 function interface
11. Java 8 consumer functional interface
12. java 8 supplier functional interface
13. Java 8 method reference
14. Java 8 optional class
15. Java 8 stream pipeline flow
16. Java 8 stream api operations
17. create java 8 stream
18. stream api - create java 8 streams
19. java 8 stream api- range v/s rangeclosed
20. java 8 stream api - filter | collect
21. java 8 stream api - map function distinct | filter
22. java 8 stream api - flatmap
23. java 8 interview question - sort employee list using stream api function
24. java 8 interview question - built in functional interfaces in java
25. Create Immutable class in Java
26. what is a web service ?
27. Watch Introduction to Microservices 08.50 Minutes
28. Watch Microservices components in one video 20 Minutes
29. Watch How to Install Spring Tool Suite on Windows Machine
Subscribe and share okayjava
Q.What is Lambda expression ?
A lambda expression is an anonymous (nameless) function
function without name, without return type and without access modifier.
Lambda exp/function doesn’t belong to any class
provides a clear and concise way to write code
We use lambda exp to provide implementation to the method of a functional interface (user defined or build-in/predefined )
Functional interface provides reference to the lambda exp.
Lambda exp Syntax
(parameter_list) arrow sign/lambda sign/LS {function_body}
Zero Parameters
One Parameter
() is optional is for a single parameters.
Multiple Parameters
Lambda exp Optional
Optional type declaration :
No need to declare the type of a parameter. The compiler can inference the same from the value of the parameter
Optional parenthesis around parameter :
No need to declare a single parameter in parenthesis. For multiple parameters, parentheses are required
Optional curly braces :
No need to use curly braces in expression if the body contains a single statement
Optional return keyword :
The compiler automatically returns the value if the body has a single expression to return the value.
Curly braces are required to indicate that expression returns a value
Variable Scope in Lambda exp :
Lambda expression is capable of accessing variables declared outside the lambda function body
Local variables : declared with in the method itself
Instance variables : declared outside of the method / class level variables
Static variables : declared using ‘static’ keyword
What is final variable or effectively final variable ?
1. Java 8 new features
2. Java 8 functional interface part
3. Java 8 functional interface coding
4. Functional Interface prior to Java 8
5. Default methods in interface
6. Default methods Diamond Problem in java 8
7. Java 8 lambda expression
8. Lambda expression variable scope interview questions
9. Java 8 predicate functional Interface
10. Java 8 function interface
11. Java 8 consumer functional interface
12. java 8 supplier functional interface
13. Java 8 method reference
14. Java 8 optional class
15. Java 8 stream pipeline flow
16. Java 8 stream api operations
17. create java 8 stream
18. stream api - create java 8 streams
19. java 8 stream api- range v/s rangeclosed
20. java 8 stream api - filter | collect
21. java 8 stream api - map function distinct | filter
22. java 8 stream api - flatmap
23. java 8 interview question - sort employee list using stream api function
24. java 8 interview question - built in functional interfaces in java
25. Create Immutable class in Java
26. what is a web service ?
27. Watch Introduction to Microservices 08.50 Minutes
28. Watch Microservices components in one video 20 Minutes
29. Watch How to Install Spring Tool Suite on Windows Machine
Subscribe and share okayjava
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