ByteBuffer: getDouble() : ByteBuffer « java.nio « Java by API

1. Java by API
2. java.nio
3. ByteBuffer

ByteBuffer: getDouble()

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

public class Main {
  public static void main(String[] args) throws Exception{
    File aFile = new File("primes.txt");
    FileInputStream inFile = new FileInputStream(aFile);
    FileChannel inChannel = inFile.getChannel();
    ByteBuffer buf = ByteBuffer.allocateDirect(1024);
    buf.position(buf.limit());
    while (true) {
      if (buf.remaining() < 8) {
        if (inChannel.read(buf.compact()) == -1) {
          break;
        }
        buf.flip();
      }
      int strLength = (int) buf.getDouble();
      if (buf.remaining() < 2 * strLength) {
        if (inChannel.read(buf.compact()) == -1) {
          break;
        }
        buf.flip();
      }
      byte[] strChars = new byte[2 * strLength];
      buf.get(strChars);
      if (buf.remaining() < 8) {
        if (inChannel.read(buf.compact()) == -1) {
          break;
        }
        buf.flip();
      }
      System.out.println(strLength);
      System.out.println(ByteBuffer.wrap(strChars).asCharBuffer());
      System.out.println(buf.getLong());
    }
    inFile.close();  }

}

   
    
    
  

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