In my blog I write about misconceptions. Encapsulation is something you learn when you study Java and OOP. But it seems that most books fail to truly explain the problems you want to solve with it and those you get by using it. Often it’s just a short chapter or even just a small part about the important concepts of OOP. This is leading to misconceptions and poor understanding of OOP.
(Note: I wrote this before the release of Java 10. Expect that some things are somewhat outdated.)
Continue reading Encapsulation
You may wonder if double checked locking (DCL) works in Java. It does and it doesn’t. I explain why. Continue reading Double Checked Locking in Java
So Java has references. But what about pointers and pass-by-reference? References in Java are different to PHP, C# and other languages. And this can cause some confusion. Continue reading What are References in Java?
Java (both the language and the JVM) are not aware of constants. To reduce confusion it’s better to not use the term “constant” in Java code, unless it’s actually a universal constant. Continue reading Java knows no Constants
A language can’t be slow. Or how fast do you think English is?
And modern JVMs are highly optimized. Continue reading Java is not slow
Here’s some advice to all who have just begun learning Java. This also serves as an overview to my blog, where I write about all kinds of misconceptions and common problems with programming in Java. Continue reading Dos and Don’ts
Some Mammals can fly. Dog extends Mammal, but it can’t fly. The term “extends” leads to some misconceptions. Continue reading Misconceptions about the “extends” Keyword
There’s a lot of confusion about “functions” in Java. Java doesn’t really have them, but an object could represent a function so it kind of does have them. I try to explain the different meanings of “functions” in Java, other languages and in mathematics.
Continue reading Functions in Java
New is used to create new objects. But it’s used carelessly.
Continue reading Misconceptions about the new Operator
The given implementation for
hashCode is somewhat a mystery. Some misconceptions about it confuse students. I try to explain it. Continue reading Misconceptions about Object.hashCode()