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Java 24 is here, bringing a host of improvements to performance, security, and developer productivity. With a focus on integrity by default, better garbage collection, and virtual threads, this release continues Java's evolution as a powerful, efficient, and modern programming language.

In this article, we’ll explore the new features of Java 24, provide syntax examples, and explain how to make the most of this update.

Key Features in Java 24

1. Compact Object Headers (JEP 450)

To reduce memory overhead, Java 24 introduces compact object headers, which optimize memory management in JVM applications.

Example:

        
public class MemoryEfficientClass {
    private int id;
    private String name;
    
    public MemoryEfficientClass(int id, String name) {
        this.id = id;
        this.name = name;
    }
}
        
    

Java 24’s JVM optimizations reduce the memory footprint of objects like this, making applications more efficient.

2. Virtual Threads (JEP 453)

Virtual threads, introduced in Java 19 as a preview, are now fully stable in Java 24, making concurrent programming easier and more scalable.

Example:

        
import java.util.concurrent.Executors;

public class VirtualThreadsDemo {
    public static void main(String[] args) {
        try (var executor = Executors.newVirtualThreadPerTaskExecutor()) {
            for (int i = 0; i < 10; i++) {
                executor.submit(() -> System.out.println(Thread.currentThread()));
            }
        }
    }
}
        
    

This program creates lightweight virtual threads that execute concurrently without overwhelming system resources.

3. Enhanced Pattern Matching (JEP 457)

Pattern matching enhancements in Java 24 simplify conditional checks, making code more concise and readable.

Example:

        
public static void checkObject(Object obj) {
    if (obj instanceof String s) {
        System.out.println("This is a string: " + s.toUpperCase());
    } else if (obj instanceof Integer i) {
        System.out.println("This is an integer: " + (i * 2));
    }
}
        
    

This pattern-matching feature eliminates the need for explicit casting.

4. Improved Garbage Collection (JEP 454)

Java 24 enhances ZGC and G1 Garbage Collectors, improving latency and memory efficiency.

 Example:

        
public class GarbageCollectionTest {
    public static void main(String[] args) {
        for (int i = 0; i < 1_000_000; i++) {
            String temp = new String("Test" + i);
        }
        System.gc();
    }
}
        
    

Java 24 optimizes memory allocation and reduces pause times, enhancing performance in large-scale applications.

How to Upgrade to Java 24

To install Java 24, follow these steps:

1. Download Java 24 from the [official JDK website]

2. Set up your environment variables:

   export JAVA_HOME=/path/to/java24

   export PATH=$JAVA_HOME/bin:$PATH

  

3. Verify your installation:

   java -version

   

   This should return `Java 24 (JDK 24.0.1).

Conclusion

Java 24 enhances performance, security, and developer productivity with compact object headers, virtual threads, pattern matching, and improved garbage collection. By upgrading to Java 24, developers can build faster, more efficient applications while writing cleaner, more maintainable code.

🚀 Stay ahead—start using Java 24 today!

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