aws lambda java core

Java core technology-New Features of Java 8-Lambda expressions1. General description Java 8 new featuresFunctional InterfaceLambda expressions (closures)2 Java 8 new features Oracle released the official

references cannot exist independently and are always converted to instances of a functional interfaceYou can use this and the super parameter in a method referenceThis::equals equivalent to X->this,equals (x)3.5 constructor ReferenceA constructor reference is similar to a method reference, except that the method name is new. For example, Person::new is a reference to the person constructor. Which constructor is called depends on the context.You can establish a constructor reference with an arra

1365.2 Split iterators with fork/join1455.3 Exception 1495.4 Example Description: Recursive grep1555.5 Summary 166Chapter 6th performance of Flow 1676.1 Micro-Benchmark Metric 1706.1.1 Measuring Dynamic Runtime 1716.1.2 Java microbenchmarking Harness1736.1.3 Test Method 1746.2 Select execution Mode 1786.3 Stream Characteristics 1816.4 Sort 1846.5 stateful operation and stateless operation 1876.6 Packing and Unpacking 1886.7 Split iterator Performance

Lambda An expressionform: parameter, arrow (-), expressionParameter type to write, if you can deduce it can not writeOnly one argument can omit parenthesesNo arguments to write empty brackets ()* If the branch returns a value, then all branches will return a value, otherwise it is illegalfunction interface: interface with only one abstract method (can be marked with @functionalinterface annotations)For example, you can do this in Javax.swing.Timer.　　　

comparable2publicint Comparato (Employee Other)3 {4 return Double. Compare (salary, other.salary); 5 }}Note the type conversion of the Object parameterWhy not provide a Comparableto method directly in the employee class? The main reason is that Java is a strongly typed (strongly typed) language. When the method is called, the compiler checks to see if the method exists.1 PackageCc.openhome;2 Importjava.util.Arrays;3 Public classJiekou {4

box containing a message and an OK button, which will be in the center of its parent component.API javax.swing. Timer 1.2Timer (int interval, ActionListener Listener)Constructs a timer that advertises listener once every interval millisecond.void Start ()Start the timer. Once the boot is successful, the timer invokes the listener's actionperformed.API void Stop ()Stop the timer, and once the stop is successful, the timer will not be actionperformed to call the listener.Java. Awt. Toolkit 1.0Sta

Java 8 new features-Lambda expressions, java8-lambda1. General description Java 8 new featuresFunctional InterfaceLambda expressions (closures)2 Java 8 new features Oracle released the official Java 8 version in March 2014, which is the most revolutionary version since JDK5.

-term objective. The short-term objective is to work with the internal iteration and parallel processing of "Set-class batch processing" (as described below ); the long-term goal is to direct Java to the functional programming language (not to completely become a functional programming language, but to make it more functional programming language features ), for this reason, Oracle does not simply use internal classes to implement

checking the status and updating the log is abstracted and encapsulated into the Runwithintransaction method. We send this method a piece of code that needs to be run in the transaction context. We don't have to worry about who forgot to perform this step or not to handle the exception. This function of implementing the policy has already taken care of this. We will introduce in the fifth chapter if you use lambda expressions to apply such a strateg

exist in the collection object. But we cannot intervene in the function of this method, for example, if a different casing scheme can be used to think that the string being looked up exists in this collection object, we hope that the contains () method will return true at this point.To put it simply, what we'd like to do is "pass our own new code into" the existing method, and then call the code passed in. Lambda expressions provide a good way to rep

completely unused-which is certainly fine, but it's important that the lambda brings closure to Java. Thanks to the support of the LAMDBA to the collection, the performance of the set traversal is greatly enhanced by the lambda in the multi-core processor condition, and we can handle the collection in the form of data

Java 8 Lambda, javalam.pdf Some new projects within the company adopt Java 8 one after another, so that we have the motivation to study Java 8's legendary big killer. The first improvement mentioned in the Java 8 document is Lambda