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JavaCL is an Object-Oriented API that makes the C OpenCL API available to Java in a very natural way. It hides away the complexity of cross-platform C bindings, has a clean OO design (with generics, Java enums, NIO buffers, fully typed exceptions...), provides high-level features (OpenGL-interop, array reductions) and comes with samples and demos. For more info, please visit http://code.google.com/p/nativelibs4java/wiki/OpenCL.

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package com.nativelibs4java.opencl.util.fft;

import com.nativelibs4java.opencl.*;
import com.nativelibs4java.opencl.CLPlatform.DeviceFeature;
import java.io.IOException;
import java.nio.DoubleBuffer;

/**
 * Slow OpenCL Fourier Transform that works in all cases (double precision floating point numbers)
 */
public class DoubleDFT extends AbstractDFT {

    final DoubleDFTProgram program;

    public DoubleDFT(CLContext context) throws IOException {
        super(context, Double.class);
        this.program = new DoubleDFTProgram(context);
    }
    public DoubleDFT() throws IOException {
        this(JavaCL.createBestContext(DeviceFeature.DoubleSupport));
    }

    @Override
    protected CLEvent dft(CLQueue queue, CLBuffer inBuf, CLBuffer outBuf, int length, int sign, int[] dims, CLEvent... events) throws CLException {
        return program.dft(queue, (CLBuffer)inBuf, (CLBuffer)outBuf, length, sign, dims, null, events);
    }
 }