156. Copying and slicing memory segments

Let’s consider the following memory segment (arena is an instance of Arena):

MemorySegment srcSegment = arena.allocateArray(
  ValueLayout.JAVA_INT, 1, 2, 3, 4, -1, -1, -1, 
                        52, 22, 33, -1, -1, -1, -1, -1, 4);

Next, let’s see how we can copy the content of this segment.

Copying a segment

We can make a copy of this memory segment via copyFrom(MemorySegment src) as follows:

MemorySegment copySegment = srcSegment.copyFrom(srcSegment);

We can easily see if the data was copied as follows:

System.out.println("Data: " + Arrays.toString(
  copySegment.toArray(ValueLayout.JAVA_INT)));

This is a bulk operation that creates a full copy of the given memory segment.

Copying a part of the segment into another segment (1)

Let’s suppose that we want to copy only a part of srcSegment into another segment (dstSegment). For instance, if we wanted to copy the last...