How do you use compressed oops with a simple code example?

Compressed oops (ordinary object pointers) is a feature in the Java Virtual Machine (JVM) that allows for more efficient memory usage by reducing the size of object references in 64-bit JVMs. This is particularly useful for applications that work with a large number of objects, as it can help to lower the memory footprint and improve performance.

To enable compressed oops, you can use the flag -XX:+UseCompressedOops when starting your Java application. This is enabled by default in 64-bit JVMs if the heap size is below a certain threshold.

public class CompressedOopsExample { public static void main(String[] args) { // Example of creating multiple objects int objectCount = 1000000; MyObject[] objects = new MyObject[objectCount]; for (int i = 0; i < objectCount; i++) { objects[i] = new MyObject(i); } System.out.println("Created " + objectCount + " objects."); } } class MyObject { int id; MyObject(int id) { this.id = id; } }

compressed oops Java JVM memory efficiency object references

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