Java1.8 function Interface __ Block chain

Reproduced from: Java 8 Functional interface

A functional interface (functional Interface) is a generic interface with a method.
A functional interface can be implicitly converted to a lambda expression.
Functional interfaces can have existing functions to support lambda in a friendly way.
Pre-JDK 1.8 functional interfaces: Java.lang.Runnable java.util.concurrent.Callable java.security.PrivilegedAction Java.util.Comparator Java.io.FileFilter Java.nio.file.PathMatcher Java.lang.reflect.InvocationHandler Java.beans.PropertyChangeListener Java.awt.event.ActionListener Javax.swing.event.ChangeListener

JDK 1.8 New Added function interface: java.util.function

Serial Number	Interface	Description
1	Biconsumer	Represents an operation that accepts two input parameters and does not return any results
2	Bifunction	Represents a method that accepts two input parameters and returns a result
3	Binaryoperator	Represents an operation that acts on two homogeneous operators and returns the result of the same type of operator
4	Bipredicate	Represents a Boolean value method of two parameters
5	Booleansupplier	Represents the provider of a Boolean value result
6	Consumer	Represents an operation that accepts an input parameter and does not return
7	Doublebinaryoperator	Represents an operation that acts on the two double value operator and returns the result of a double value.
8	Doubleconsumer	Represents an operation that accepts a double value parameter and does not return a result.
9	Doublefunction	Represents a method that accepts a double value parameter and returns the result
10	Doublepredicate	Represents a Boolean method that has a double value parameter
11	Doublesupplier	Represents a provider of a double value structure
12	Doubletointfunction	Accepts a double type input, returning an int type result.
13	Doubletolongfunction	Accepts a double type input and returns a long type result
14	Doubleunaryoperator	Accept a parameter with the same type double, and the return value type double.
15	Function	takes an input parameter and returns a result.
16	Intbinaryoperator	Accepts two parameters with the same type int, and the return value type is int.
17	Intconsumer	accepts an int type input parameter with no return value.
18	Intfunction	accepts an int type input parameter and returns a result.
19	Intpredicate	accepts an int input parameter, returns the result of a Boolean value.
20	Intsupplier	No parameters, returns an int type result.
21st	Inttodoublefunction	accepts an int type input and returns a double type result.
22	Inttolongfunction	accepts an int type input and returns a long type result.
23	Intunaryoperator	Accepts a parameter of the same type int, and the return value type is int.
24	Longbinaryoperator	Accepts two arguments of the same type long, and the return value type is long.
25	Longconsumer	Accepts a long type input parameter with no return value.
26	Longfunction	Takes a long type input parameter and returns a result.
27	Longpredicate	R takes a long input parameter and returns a Boolean type result.
28	Longsupplier	No arguments, returns a value of type long.
29	Longtodoublefunction	Accepts a long input and returns a double type result.
30	Longtointfunction	Takes a long type input and returns an int type result.
31	Longunaryoperator	Accepts a parameter of the same type long, and the return value type is long.
32	Objdoubleconsumer	Accepts an input parameter of type object and a double, no return value.
33	Objintconsumer	Accepts an input parameter of type object and an int type with no return value.
34	Objlongconsumer	Accepts an object type and a long type input parameter with no return value.
35	predicate	Accepts an input parameter and returns a Boolean result.
36	Supplier	No parameters, returns a result.
37	Todoublebifunction	Accepts two input parameters, returns a double type result
38	Todoublefunction	Accepts an input parameter, returns a double type result
39	Tointbifunction	Accepts two input parameters and returns an int type result.
40	Tointfunction	Accepts an input parameter and returns an int type result.
41	Tolongbifunction	Accepts two input parameters and returns a long type result.
42	Tolongfunction	takes an input parameter and returns a long result.
	unaryoperator	accepts a parameter of type T, and the return value type is T.