We look at the JVM options for allocating memory. allUsing the right runtime options to set memory size is as important as choosing the right garbage collector.
We look at generational garbage collection. What is garbage and what is garbage collection? And why is it important to understand heap memory?
We look at the role of the garbage collector in Java. There are multiple garbage collectors, and it’s important to choose the right one for better performance.
The Ahead of Time (AOT) compiler compiles Java classes to native code before running the Java application. It is a way to improve performance. AOT was introduced and then removed from OpenJDK, but is still available.
We look at the JVM (Java Virtual Machine) command line options that customise how the interpreter and the JIT compiler operate at runtime.
The role of the JVM interpreter is to compile Java code to intermediate bytecode, which is then executed by an interpreter. We can also use a JIT compiler. A quick review of the compiler, interpreter and the JVM.
Java strings are internally represented in either ASCII or UTF-16. So a Java programmer should know something about ASCII, Unicode and UTF. We look at ASCII, Unicode, UTF-8, UTF-16 and UTF-32
Compact strings in Java are an enhancement introduced in Java 9. Strings use a lot of heap memory. Reducing the internal size of a string can save memory and garbage collection overhead. Let’s have a look at how compact strings work in Java.
Choosing a collection in Java is important. You want to know how to choose the right concrete collection class to use for your Java collection. In this article we look at choosing the interface, choosing the implementation, and comparing the various concrete classes in the Collections framework.
Big O notation is a tool we use to analyse the cost of an algorithm. It is a useful concept when we want to choose which collection class to use for a particular use case
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