Programmer Group

1 byte code technology application scenario AOP Technology Lombok de duplication plug-in Dynamically modify class files, etc 2-byte technology advantage Java bytecode enhancement refers to modifying and enhancing the function of Java bytecode after it is generated, which is equivalent to modifyi ...

I. Introduction When a program uses a class, if the class has not been loaded into memory, the JVM will load the class through three steps: loading, linking, and initializing. 2, Class loading, linking, initialization 1, loading Class loading refers to reading class files into memory and creating ...

Article directory Program, process, thread Create thread Startup thread Thread safety To solve the problem of thread safety (to realize Runnable) -- synchronous code block To solve the problem of thread safety (to realize Runnable) -- synchronization method To solve the Thread safety problem (inhe ...

Sketch Java originated from Oak, a development language developed by Sun company for set-top box, which was renamed "Java" because of its name. Java is an object-oriented development language. Its characteristic is "compile once, run everywhere". This implementation depends on JVM. Basic design of Java program A basic Java ...

Java objects are instances of the Object class, so you can directly call the methods defined in the class toString() class Person { private String name; public Person(String name) { this.name = name; } } public class PrintObject { public static void main(String[] args) { ...

(all screenshots in the figure, as well as data notes, come from the power node, for self-study and use) 1. What is the exception? First, abnormal simulation is "abnormal" events in the real world Second, in java, exceptions are simulated by means of "classes" Exception description u ...

I need to find a caller for a method.Can stacktrace or reflection be used? #1st floor This is part of the code that I wrote based on the tips shown in this topic.Hope to help you. (Please let me know if you have any suggestions to improve this code) Counter: public class InstanceCount{ private static Map<Integer, CounterIn ...

I. reflection Reflection mechanism is the most commonly used in java development. For example, reflection mechanism is used in all three frameworks. JAVA reflection mechanism is in the running state. For any class, you can know all the properties and methods of this class. For any object, you can ca ...

background Recently, companies are building big data systems, and architects recommend using Flink to build them.So this day, I'm investigating Flink in my own virtual machine environment (Ubuntu 16.4). from ververica I learned the fundamentals of flink in school, because I worked on python data pr ...

Obviously, the search performance of the general HashSet < T > class is higher than that of the general list < T > class. Just compare the hash based key with the linear method in the list < T > class. However, it may take some CPU cycles to calculate the hash key itself, so for a small number of items, linear search can r ...