What Lambda that?
Lambda is an anonymous function, we can put Lambda expressions it can be understood as a piece of code passed (pass code is the same as the data). You can write simpler, more flexible code. As a more compact style code, java language expressing ability has been improved
Lambda expression syntax
Lambda expressions introduced a new syntax elements and operators in the Java language. This operator is " -> ", the operator or operators is called Lambda arrow operator. It Lambda divided into two parts:
the left : specifies all the parameters required Lambda expressions
right : Lambda specified functions, i.e. Lambda be performed.
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A syntax: no arguments and returns no value, Lambda body of only one statement
Runnable r1=()->System.out.println(“Hello Lambda!”);
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Two syntax: Lambda requires an argument
Consumer<String> fun=(args)->System.out.println(args);
- Syntax III: Lambda when only one parameter, the parameter can be omitted parentheses
Consumer<String> fun=args->System.out.println(args);
- Syntax four: Lambda requires two parameters, and return values
BinaryOperator <Long> BO = (X, Y) -> {
System.out.println ( "function implemented interface methods!");
Return X + Y;
}
- Syntax five: Lambda body only when a statement, return with braces may be omitted
BinaryOperator<Long> bo=(x,y)->x+y;
- Six syntax: type of data can be omitted, as inferred by the compiler, called "type inference"
Reproduced in: https: //www.cnblogs.com/drl-blogs/p/10803013.html