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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.util.Transformer.AbstractTransformer;
import java.io.IOException;
import java.nio.Buffer;

public abstract class AbstractDFT extends AbstractTransformer {

    // package-private constructor 
    AbstractDFT(CLContext context, Class primitiveClass) throws IOException, CLException {
        super(context, primitiveClass);
    }
    protected abstract CLEvent dft(CLQueue queue, CLBuffer inBuf, CLBuffer outBuf, int length, int sign, int[] dims, CLEvent... events) throws CLException;

    @Override
    public CLEvent transform(CLQueue queue, CLBuffer inBuf, CLBuffer outBuf, boolean inverse, CLEvent... eventsToWaitFor) throws CLException {
        int length = (int)inBuf.getElementCount() / 2;
        return dft(queue, inBuf, outBuf, length, inverse ? -1 : 1, new int[]{length}, eventsToWaitFor);
    }
 }