DataInputStream enable you to read primitive data from a stream.
It implements DataInput interface.
DataInput interface defines methods that convert primitive values from a sequence of bytes.
DataInputStream makes it easy to store binary data, such as integers or floating-point values, in a file. DataInputStream extends FilterInputStream, which extends InputStream, and it implements the DataInput interface.
Here is its only constructor:
DataInputStream(InputStream inputStream)
inputStream specifies the input stream from which data will be read.
DataInputStream reads a sequence of bytes and convert them into values of a primitive type.
Here is a sampling of these methods:
double readDouble( ) throws IOException
boolean readBoolean( ) throws IOException
int readInt( ) throws IOException
The following program demonstrates the use of DataOutputStream and DataInputStream:
import java.io.DataInputStream;
import java.io.FileInputStream;
public class MainClass {
public static void main(String args[]) {
try {
FileInputStream fis = new FileInputStream("fileName.dat");
// Create a data input stream
DataInputStream dis = new DataInputStream(fis);
// Read and display data
System.out.println(dis.readBoolean());
System.out.println(dis.readByte());
System.out.println(dis.readChar());
System.out.println(dis.readDouble());
System.out.println(dis.readFloat());
System.out.println(dis.readInt());
System.out.println(dis.readLong());
System.out.println(dis.readShort());
// Close file input stream
fis.close();
} catch (Exception e) {
System.out.println("Exception: " + e);
}
}
}