Can several different data types be written to the same file?

A good answer might be:

Yes; that is what the example program did.

The data are written as a stream of bytes. There are no gaps or markers that say were one value ends and another begins. The example program did this:

    dataOut.writeInt( 0 );
    dataOut.writeDouble( 12.45 );

An examination of the file shows the 12 bytes. Remember that dumps such as this print characters to show the pattern in one byte.

The six zeros at the beginning of the line mean the the first byte shown is byte zero of the file. The "f's" the end of the line show that some bytes of the double could also be interpretted as characters.

QUESTION 13:

Is it possible to tell just by looking at the bytes what types the data are?