How to use lambda expressions in java8

This article introduces how to use lambda expression in java8, the content is very detailed, interested friends can refer to, hope to be helpful to you.

1.lambda indicates that it can be used everywhere. It is only used in functional interfaces.

2, for example, Chestnut has such an interface.

Public interface LumbdaTestinterface {String test (String name);}

What if I want an implementation object? The first method writes another class implementation interface and overrides the test method

The second method is to create an anonymous implementation class directly when you use it, such as this

LumbdaTestinterface lumbdaTestinterface= new LumbdaTestinterface () {@ Override public String test (String name) {return "slim" + name;}}

The lambda expression simplifies the above anonymous implementation as follows

LumbdaTestinterface testLambdaService = (name)-> {return "slim" + name;}

The parentheses in front of the parameters are written directly, the multiple parameters are separated by commas (the type can be omitted), and the method is written directly in parentheses after the arrow. There is only one parameter, and parentheses can be left unwritten. If you don't wrap the line after the arrow, you can save curly braces and return.

three. This implementation doesn't even have a method name, so why can you implement the test method? This is mentioned in 1, and this writing requires that the class can only have one abstract method, so this writing is the method to be implemented by default.

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