import java.io.BufferedOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
public class MainClass {
public static void main(String[] argv) {
try {
RandomAccessFile raf = new RandomAccessFile("datafile", "rw");
BufferedOutputStream bos = new BufferedOutputStream(raf);
DataOutputStream dos = new DataOutputStream(bos);
dos.writeDouble(Math.PI);
dos.close();
bos.close();
raf.close();
} catch (IOException e) {
}
}
}
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