In this post, we will discuss why it is important to override equals and hashCode method in Java/Kotlin. Item 9 in Josh Bloch’s Effective Java suggests always override hashCode() method if the class overrides equals(). In this post, we will discuss why this is necessary and good practice. We know that two objects are considered equal only if their references point...
Tutorial: Multi-touch gesture for android
Multi-touch gestures are very useful in many common scenarios, such as zooming, panning. For game development, handling multi-touch is essential. This post will give a quick guide for handling multi-touch points. Project structure We create a new project name MultiTouch with Java and add a new class named GameScene as a subclass of android.view.View. The basic GameScene class is as follows...
Asteroid Collision Solution – Leetcode coding challenge
The following asteroid collision problem is from Leetcode. The problem We are given an array asteroids of integers representing asteroids in a row. For each asteroid, the absolute value represents its size, and the sign represents its direction (positive meaning right, negative meaning left). Each asteroid moves at the same speed. Find out the state of the asteroids after all collisions. If two...
Touch me if you can (V.0.1)- Hero vs monsters game
Hero VS Monsters This is a (very) simple JAVA implementation of the game “hero vs monsters” as part of the year 1 BSE lab. The implementation is mainly for demonstrating the custom view and touch event. Video tutorial is at the end of the article. The UI it will be a very simple UI with only one view (game view) that extends Android View. In the scene, a hero is trying to kill...
Top programming languages to learn 2020-2021
“What is the best programming language to learn” is generally not a good question. A language should bind to a purpose, developing environment. Set it aside, popular languages often come with trending jobs. Here is the list of top 7 programming languages to consider in 2020 and 2021. 1. Python python trademark The programming language continues to be one of the best programming...