Understanding the Order of Code Execution in Java Classes

FullStackTips
3 min readFeb 25, 2023
Java code execution flow

Have you ever wondered how the code of a Java class is executed?

When you create a class in Java, the order in which the methods are defined and the code blocks determine the order in which the code is executed. Understanding this order is important for writing efficient and organized code.

In this blog post, we will take a closer look at the order of code execution in a Java class and provide sample code to illustrate each step. At the end of this article, you will have a better understanding of how the code of a Java class is executed.

So, let’s dive in!

The order of code execution in a Java class is as follows.

  1. Static variables are initialized.
  2. Static blocks are executed.
  3. Instance variables are initialized.
  4. Instance blocks are executed.
  5. Constructor is executed.
  6. Static methods can be called without creating an instance.

Let’s look at each of these steps in more detail with an example.

Consider the following class, CodeExecutionExample, which has static and instance variables, static and instance blocks, a constructor, and a static method:

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