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The DataOutputStream class

Textbook: Section 14.5

DataOutputStream works analogously to DataInputStream. It's layered on top of the FileOutputStream class (technically, the OutputStream class, which FileOutputStream extends).

DataOutputStream(FileOutputStream out)

Creates a DataOutputStream that uses out whenever it wants to write more bytes.

int write(byte[] b)

Attempts to write all the bytes of b into the file - this is the same thing that FileOutputStream provided.

void writeInt(int i)

Writes 4 bytes representing the integer value i.

void writeDouble(double d)

Writes 8 bytes representing the double value d.

void writeUTF(String s)

Writes the string s using the UTF standard.

Next: Writing objects to files. Up: Binary files. Previous: The DataInputStream class.