21 min read
A quick reference for data structures, basic syntax, and essential APIs in Lua, JavaScript, Go, Python, and Java.
Tags
- 13 writings
- since 2023
2025
Spring
2024
Autumn
7 min read
Introduce Variance in Generic Types, Type Erasure, and Related Concepts
12 min read
The proxy pattern lets one object stand in for another, controlling access to it and adding features like logging, access control, lazy loading, or monitoring without touching the target's core logic.
6 min read
An introduction to Java's PriorityQueue, its API, custom comparators, and the binary min-heap that powers it.
Summer
6 min read
Apache Tomcat is an open-source, lightweight web application server that implements the Java Servlet and JavaServer Pages (JSP) specs and part of Java EE.
7 min read
MyBatis notes from the Heima Programmer Java Web course, covering core concepts and a Spring Boot CRUD demo.
13 min read
Maven, the project management tool for Java. Covers basic usage including dependency management, the build lifecycle, and multi-module design.
Spring
7 min read
How Java reflection works, how to obtain Class objects, create instances, invoke methods, and read annotations at runtime, plus its performance trade-offs.
Winter
10 min read
An introduction to the Stream API introduced in Java 8
3 min read
Single Abstract Method Interfaces are Java functional interfaces. This post explains how to create and use them with lambdas and references.
7 min read
Java is neither pure pass-by-value nor pass-by-reference. The answer hides in a term most discussions miss: call-by-sharing.
6 min read
A hash table looks up data in O(1) time. This post walks through hash tables in the Java ecosystem: the data structure, the put process, and thread safety.
2023
Autumn
12 min read
Study notes on Java Generics, covering wildcards, PECS, type inference, and how to design generic classes, interfaces, and methods.