functional interface java 8

so all the subclasses inherited from this abstract class have the alarm function, but some doors do not necessarily have the alarm function; 2 The three functions are placed in the interface, the need to use the alarm function of the class need to implement the interface Open () and close (), perhaps this class does not have the open () and close () these two functions, such as fire alarm. It can be seen

By passing Java objects through a messaging server, the Java class must implement a serialization interface that transforms a Java object into a byte array, passed from a consumer or producer to another JVM, and requires two JVMs to share the class, such as the UserInfo class.1. Class UserInfo for defining serializatio

callback function conveniently, and the callback isOnce a method has obtained a reference to an inner class object, it can then, in turn, invoke the method of the external class instance in the appropriate way. For example, the following program:Public interface Info {public void work ();}public class Teacher {private string name;public Teacher (String name) {this.name=name;} public void Test () {System.out.println (name+ "at Work");} Private class w

disadvantage of inheritance: the coupling of the class to enhance) (4)Disadvantages of inheritance:A: To enhance the coupling of the class. Such a change in a class will affect other classes related to that class. Principle: Low coupling, high cohesion. Coupling: The relationship between classes and classes: the ability to accomplish something by themselves B: Breaking the Encapsulation (5)characteristics of inheritance in JavaA:java class only supports single-inheritance B:java can be multi-la

lock requires all read locks to be freed, a deadlock occurs if there are two read lock views that acquire a write lock without releasing the read lock. Lock get Interrupt Both the read lock and the write lock support the acquisition lock during the outage. This is consistent with the exclusive lock. Condition variable The write lock provides support for the conditional variable (Condition), which is consistent with the exclusive lock, but the read lock do

summarize the load time of a class by saying that the class is loaded when any of its static members are accessed.7. ArraysThe initialization of an array can use a special expression, as follows:Int[] A = {1,2,3,4,5};Note: In this case, the allocation of the storage space will be the responsibility of the compiler. This approach is allocated in heap space (equivalent to using new) rather than stack space, which differs from C + +. And the copy of the array is simply a copy of the reference.

First, interface overview　　　　An interface is a collection of functions, which can also be seen as a data type, which is a more abstract class than an abstract class.The interface only describes the methods that should be available, and there is no specific implementation, specifically implemented by the interface imple

[Java class set] _ recognition class set and collection interface notes 3. Details Function of Class Set A class set is actually a dynamic array of objects. unlike an ordinary array of objects, the content of the class set objects can be expanded at will. Features of a class set:1. This framework is of high performance.2. The framework must allow different types of class sets to work in the same and

First, the default method;With the default method, you can add an instantiation method to an interface (Interface interface_name):The code is as follows:1 Public Interface Testdefault 2 {3 Public default void Printhello () {4 System.out.println ("Hello world!" ); 5 }6 }Call this method: 1 public class Main implements testdefault{ 2 public

Lambda is a key feature of Java8, Java 8:lambdas Java Collections | The Zeroturnaround.com article describes methods for processing large amounts of data using a lambda collection.First, the Java collection introduced internal traversal, the original Lambdaj below this method can also be implemented in JAVA8:

do not feel mysterious, can go to analyze the underlying causes of abnormal faults, I deliberately summed up a system of learning programs, this knowledge is systematically passed through a small program case to everyone.Performance tuning:Application Framework Source code interpretation:Distributed architecture:Micro-service Topics:Team Collaboration Development:Shopping mall Project Combat:To help you get out of this midlife crisis, take the path to a raise.This time we recommend a free learn

invokevirtual #4 8 return Have you noticed the Code marked 3? Because a static final field is referenced, the compiler has compiled the name content in interface a into Class B, instead of referencing the name in interface. Therefore, unless we re-compile Class B, the name changes in interface a cannot be reflected in

inherited from this abstract class have the alarm function, but some do not necessarily have the alarm function; 2) place these three functions in the interface. To use the alarm function, you need to implement open () and close () in this interface (), maybe this class does not have the open () and close () functions at all, such as fire alarms. From this we can see that Door's open (), close (), and alar

Java interface Syntax Details1, the default interfaceIn Java, you can use interface to define the behavior appearance of abstractions, such as methods in an interface that can be declared public abstract. For example:public interface