A data input stream enable an application read primitive Java data types from an underlying input stream in a machine-independent way(instead of raw bytes). That is why it is called DataInputStream – because it reads data (numbers) instead of just bytes.
- An application uses a data output stream to write data that can later be read by a data input stream. Data input streams and data output streams represent Unicode strings in a format that is a slight modification of UTF-8.
- DataInputStream is not necessarily safe for multithreaded access. Thread safety is optional and is the responsibility of users of methods in this class.
- DataInputStream(InputStream in) : Creates a DataInputStream that uses the specified underlying InputStream.
- int read(byte b) : Reads some number of bytes from the contained input stream and stores them into the buffer array b.
Syntax: public final int read(byte b) throws IOException Parameters: b - the buffer into which the data is read. Returns: the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached. Throws: IOException
- int read(byte b, int off, int len) : Reads up to len bytes of data from the contained input stream into an array of bytes.
Syntax:public final int read(byte b, int off, int len) throws IOException Parameters: b - the buffer into which the data is read. off - the start offset in the destination array b len - the maximum number of bytes read. Returns:the total number of bytes read into the buffer, or -1 if there is no more data Throws: NullPointerException IndexOutOfBoundsException IOException
- boolean readBoolean() : Reads one input byte and returns true if that byte is nonzero, false if that byte is zero.
Syntax:public final boolean readBoolean() throws IOException Returns:the boolean value read. Throws: EOFException IOException
- char readChar() : Reads two input bytes and returns a char value.
Syntax:public final char readChar() throws IOException Returns:the next two bytes of this input stream, interpreted as a char. Throws: EOFException IOException
- double readDouble() : Reads eight input bytes and returns a double value.
Syntax:public final double readDouble() throws IOException Returns: the next eight bytes of this input stream, interpreted as a double. Throws: EOFException IOExceptioN
- int readInt() : Reads four input bytes and returns an int value.
Syntax:public final int readInt() throws IOException Returns: the next four bytes of this input stream, interpreted as an int. Throws: EOFException IOException
The DataInputStream class is often used together with a DataOutputStream.
Implementations of some of the important methods
Notice how there is no longer any explicit close() method call. The try-with-resources construct takes care of that.
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Next Article: Java.io.DataInputStream class in Java | Set 2
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