Lambda Expressions

2. Interface that contains only one abstract method
4. Inner class with no name
5. Functional interface that accepts a single input argument and returns no result
9. Functional interface used to order the objects of user-defined classes
11. Functional interface that returns a boolean value for a given test
12. Anonymous function that you can store in a variable or pass as an argument to a method
13. Data structure for storing and manipulating groups of objects
14. Contract between a class and the outside world
16. Functional interface in which the input type is the same as the output type
18. Symbols used to mark the start and end of the parameter list of a method
20. Symbols used to explicitly define scope
21. Functional interface that takes no arguments and returns a result
22. Related code appearing alongside an expression

1. Keyword used to exit a method and yield a value
3. Returns a predicate that represents the logical negation of a given predicate
6. Symbol used to end statements in Java
7. Class that cannot be instantiated, though it can be subclassed
8. Keyword used to define an entity that can only be assigned once
10. Data type that the Java compiler expects depending on where an expression appears
15. Variable listed as part of a method declaration
17. Functional interface that takes no arguments, returns no result, and simply executes a block of code
19. Region in a program where a certain variable or method is accessible