Java ConcurrentHashMap
ConcurrentHashMap is designed to support concurrent access from multiple threads without the need for external synchronization. It achieves this by using var...
ConcurrentHashMap is designed to support concurrent access from multiple threads without the need for external synchronization. It achieves this by using var...
Try to get a certificate from Let’s encrypt on Oracle’s compute instance (vm) with command certbot certonly --standalone but keeps getting error: Certbot fai...
Note for Learning Awk Is Essential For Linux Users download awk is a tool to process text, line by line. Variable $0 means whole line, $1 means the fi...
Java 8 https://www.oracle.com/java/technologies/javase/8-whats-new.html Functional Interfaces and Lambda Expressions Default and static metho...
Test #@startuml class ExampleClass { -mPrivate: String +mPublic : int #mProtected: boolean ~mDefault: float mNothing: long +void pu...
Issue When you use Java Timer (java.util.Timer) to set a task for future execution, you should be really careful. Java Timer use currentTimeMillis, which wi...
https://learn.oracle.com/ols/course/java-se-programming-complete/82508/85200 Collections ####
https://learn.oracle.com/ols/course/java-se-programming-complete/82508/85200 Arrays and Loops Arrays An array is a fixed-length collection of eleme...
https://learn.oracle.com/ols/course/java-se-programming-complete/82508/85200 Interface Java Interface An interface defines a set of features that c...
https://learn.oracle.com/ols/course/java-se-programming-complete/82508/85200 Inheritance Extend Classes java.lang.Object is an ultimate paraent of ...