public static void main(String[] args) throws IOException {
RandomAccessFile rf = new RandomAccessFile(file, "rw");
for (int i = 0; i < 7; i++) {
rf.writeDouble(i * 1.414);
}
rf.writeUTF("The end of the file.");
rf.close();
display();
rf = new RandomAccessFile(file, "rw");
rf.seek(5 * 8);
rf.writeDouble(47.0001);
rf.close();
display();
}
public static void main(String[] args) throws Exception {
RandomAccessFile randomAccessFile = new RandomAccessFile("ratest.dat", "rw");
for (int i = 0; i < 5; i++) {
randomAccessFile.writeDouble(i * 1.44);
}
randomAccessFile.close();
;
randomAccessFile = new RandomAccessFile("ratest.dat", "rw");
randomAccessFile.seek(2 * 8);
randomAccessFile.writeDouble(48.123);
randomAccessFile.close();
randomAccessFile = new RandomAccessFile("ratest.dat", "rw");
for (int i = 0; i < 5; i++) {
System.out.println(randomAccessFile.readDouble());
}
randomAccessFile.close();
}
/**
* This writes the binary double to the file. Later, use readBinaryDouble to read the value from
* the file.
*/
public void writeBinaryDouble(int col, int row, double d) throws IOException {
raf.seek(row * nBytesPerRow + columnStartAt[col]);
raf.writeDouble(d);
}
/* @see java.io.DataOutput.writeDouble(double) */
public void writeDouble(double v) throws IOException {
raf.writeDouble(v);
}
