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From Java world to .NET world

Overview

JAVA multi threading

synchronized keyword

JAVA Static Code Analysis

This points out the differences among some tools:

jCenter vs Maven Central

This is an awesome article. Here is the summary:

• jCenter and Maven Central are both Maven Repository
• jCenter is hosted by bintray.com. Maven Central is hosted by sonatype.org.
• Other can also host their own Maven Repo servers.
• Should publish your library to standard server (e.g. jCenter and Maven Central…)
• Maven Central is harder to publish to.
• jCenter pros:
  • Use CDN
  • The largest Java Repository
  • Easy to publish library

Java nested class

Definition

Nested class is declaring a class inside another class. There are 2 types:

• Static nested class
• Non-static nested class, divided into 3 types:
  • Inner class
  • Method local inner class
  • Anonymous

Java varargs

Definition

This code declare a function that can take arbitrary number of parameters. The parameters must be the same type int.

void sampleFunction(int... args) {
    System.out.print(args.length);
    
    for (int i = 0; i < args.length; i++) {
        System.out.print(args[i]);
    }
}

It’s possible to mix varargs with other parameter types, like this:

void sampleMixingFunction(String name, Date date, int... args) {
    ...
}

The varargs must be the last parameters in function signature.
It’s not allowed to declare multiple varargs in one function.

First-class function in JavaScript and Java

What is first-class function?

• Can be named by variables.
• Can be passed as arguments to procedures.
• Can be returned as the results of procedures.
• Can be included in data structures.

Java HashMap principle

Been learning Java for a while and using HashMap many times, but today I read an article about HashMap’s buckets length and think I should dig deeper to understand it. This article is to summarize about HashMap, and how it works internally.

When and why use Java @Override annotation

When should we use @Override annotation