To find the size of a Java array, query an array’s length property. The Java array size is set permanently when the array is initialized. The size or length count of an array in Java includes both ...

Java integers are stored in 32 bits, so each vector register can hold eight Java integers (ints). The JIT will generate code to load values from the array in groups of eight.

The ability to perform SIMD operations in Java is enabled through the incubating Vector API, which is a preview feature in JDK 21. The following code snippet shows a Java Vector formed from an array.

Now available for production use, Java 19 features structured concurrency, virtual threads, pattern matching for switch expressions, a vector API, and a Linux/RISC-V port.