Java Conditional Compilation

Shubham Vora Nov 09, 2022
  1. Conditional Compile in Java
  2. Use the Boolean Variable for Conditional Compilation in Java
Java Conditional Compilation

In this article, we will learn to compile the Java code conditionally. The conditional compile removes the chunk of code while compiling the code based on certain conditions, which can be Java version-specific or OS-specific.

Conditional Compile in Java

The simplest way to set the conditional compilation is to create a global Boolean variable and compile the code according to its values. Let’s understand the conditional compile using the below example code.

Use the Boolean Variable for Conditional Compilation in Java

In the example below, we have created the file name called and created the Javaversion class inside the file, which contains the public static variable name Version.

In the file, we are accessing the Version variable and compiling the Java code according to the version.

class Javaversion {
    public static final String Version = "Java 19";

class Test {
    public static void main(String[] args) {
        System.out.println("Hello, World!");
        if (Javaversion.Version=="Java 19") {
            System.out.println("Code block executed for java 19");
            System.out.println("Code block executed for < java 19");


Hello, World!
Code block executed for java 19

Also, users can create different files with different codes of Java and compile the different files according to certain conditions.

    Class.forName(<class Name>);
	// execute the code for the `Java 17` version
    return new Java17();
}catch(Exception e){
    //fall back
    return new Java19();

In the above pseudo-code, we are detecting the class using the method and returning the object of the Java17 or Java19 class. Here, users must create the Java17 and Java19 classes in different files.

Author: Shubham Vora
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Shubham is a software developer interested in learning and writing about various technologies. He loves to help people by sharing vast knowledge about modern technologies via different platforms such as the website.

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