import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
public class MainClass {
public static void main(String[] args) {
String dirName = "c:/test";
String fileName = "test.txt";
String[] sayings = { "A1", "B12", "C123", "D1234", "E12345", "F123456", "G1234567" };
File aFile = new File(dirName, fileName);
FileOutputStream outputFile = null;
try {
outputFile = new FileOutputStream(aFile, true);
} catch (FileNotFoundException e) {
e.printStackTrace(System.err);
System.exit(1);
}
FileChannel outChannel = outputFile.getChannel();
int maxLength = 0;
for (String saying : sayings) {
if (maxLength < saying.length()){
maxLength = saying.length();
}
}
ByteBuffer buf = ByteBuffer.allocate(2 * maxLength + 4);
try {
for (String saying : sayings) {
buf.putInt(saying.length()).asCharBuffer().put(saying);
buf.position(buf.position() + 2 * saying.length()).flip();
outChannel.write(buf);
buf.clear();
}
outputFile.close();
} catch (IOException e) {
e.printStackTrace(System.err);
}
}
}