MemoryHolder.java

public class MemoryHolder {
    private long pointer;

    public MemoryHolder() {
        pointer = unsafe.allocateMemory(MEMORY);
    }

    @Override
    protected void finalize() {
        unsafe.freeMemory(pointer);
        pointer = 0;
    }

    public int getInt() {
        return unsafe.getInt(null, pointer);
    }

    public static void main(String[] args) {
        MemoryHolder holder = new MemoryHolder();
        System.out.println("holder.getInt() = " + holder.getInt());
    }
}