MainClass.java Source code

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Here is the source code for MainClass.java

Source

import static java.lang.Math.min;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.LongBuffer;
import java.nio.channels.FileChannel;

public class MainClass {
    public static void main(String[] args) {
        long[] primes = new long[] { 1, 2, 3, 5, 7 };
        File aFile = new File("C:/test/primes.bin");
        FileOutputStream outputFile = null;
        try {
            outputFile = new FileOutputStream(aFile);
        } catch (FileNotFoundException e) {
            e.printStackTrace(System.err);
        }
        FileChannel file = outputFile.getChannel();
        final int BUFFERSIZE = 100;
        ByteBuffer buf = ByteBuffer.allocate(BUFFERSIZE);
        LongBuffer longBuf = buf.asLongBuffer();
        int primesWritten = 0;
        while (primesWritten < primes.length) {
            longBuf.put(primes, primesWritten, min(longBuf.capacity(), primes.length - primesWritten));
            buf.limit(8 * longBuf.position());
            try {
                file.write(buf);
                primesWritten += longBuf.position();
            } catch (IOException e) {
                e.printStackTrace(System.err);
            }
            longBuf.clear();
            buf.clear();
        }
        try {
            System.out.println("File written is " + file.size() + "bytes.");
            outputFile.close();
        } catch (IOException e) {
            e.printStackTrace(System.err);
        }
    }
}