MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

import java.io.File;
import java.io.FileOutputStream;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;

public class MainClass {
    public static void main(String[] args) {
        try {
            test();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static void test() throws Exception {
        long[] primes = new long[] { 1, 2, 3, 5, 7 };
        File aFile = new File("C:/test/primes.txt");
        FileOutputStream outputFile = null;
        outputFile = new FileOutputStream(aFile);
        FileChannel file = outputFile.getChannel();
        ByteBuffer[] buffers = new ByteBuffer[3];
        buffers[0] = ByteBuffer.allocate(8);
        buffers[2] = ByteBuffer.allocate(8);
        String primeStr = null;
        for (long prime : primes) {
            primeStr = "prime = " + prime;
            buffers[0].putDouble((double) primeStr.length()).flip();
            buffers[1] = ByteBuffer.allocate(primeStr.length());
            buffers[1].put(primeStr.getBytes()).flip();
            buffers[2].putLong(prime).flip();
            file.write(buffers);
            buffers[0].clear();
            buffers[2].clear();
        }
        System.out.println("File written is " + file.size() + "bytes.");
        outputFile.close();
    }
}