Java.io.DataInputStream class in Java | Set 1
More Methods:
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byte readByte() : Reads and returns one input byte.
Syntax:public final byte readByte() throws IOException Returns: the next byte of this input stream as a signed 8-bit byte. Throws: EOFException IOException
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float readFloat() : Reads four input bytes and returns a float value.
Syntax:public final float readFloat() throws IOException Returns :the next four bytes of this input stream, interpreted as a float. Throws: EOFException IOException
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void readFully(byte[] b) : Reads some bytes from an input stream and stores them into the buffer array b.
Syntax:public final void readFully(byte[] b) throws IOException Parameters: b - the buffer into which the data is read. Throws: EOFException IOException
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void readFully(byte[] b, int off, int len) : Reads len bytes from an input stream.
Syntax:public final void readFully(byte[] b, int off, int len) throws IOException Parameters: b - the buffer into which the data is read. off - the start offset of the data. len - the number of bytes to read. Throws: EOFException IOException
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String readLine() : Reads the next line of text from the input stream.
Syntax: Returns: the next line of text from this input stream. Throws: IOException Deprecated This method does not properly convert bytes to characters.
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long readLong() : Reads eight input bytes and returns a long value.
Syntax:public final long readLong() throws IOException Returns: the next eight bytes of this input stream, interpreted as a long. Throws: EOFException IOException
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short readShort() : Reads two input bytes and returns a short value.
Syntax:public final short readShort() throws IOException Returns: the next two bytes of this input stream, interpreted as a signed 16-bit number. Throws: EOFException IOException
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String readUTF() : Reads a string that has been encoded using a modified UTF-8 format.
Syntax:public final String readUTF() throws IOException Returns: a Unicode string. Throws: EOFException IOException UTFDataFormatException
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int skipBytes(int n) : Makes an attempt to skip over n bytes of data from the input stream, discarding the skipped bytes.
Syntax:public final int skipBytes(int n) throws IOException Parameters: n - the number of bytes to be skipped. Returns: the actual number of bytes skipped. Throws: IOException
Program 2:
//Java program to demonstrate DataInputStream // This program uses try-with-resources. It requires JDK 7 or later. import java.io.*;
import java.lang.reflect.Array;
import java.util.Arrays;
class DataInputStreamDemo
{ public static void main(String args[]) throws IOException
{
//writing the data.
try ( DataOutputStream dout =
new DataOutputStream( new FileOutputStream( "file.dat" )) )
{
dout.writeBytes( "1" );
dout.writeFloat( 4 .4545f);
dout.writeUTF( "geeksforgeeks" );
dout.writeChars( "GeeksforGeeks\n" );
dout.writeBytes( "ABCDEFG" );
}
catch (FileNotFoundException ex)
{
System.out.println( "Cannot Open the Output File" );
return ;
}
// reading the data back.
try ( DataInputStream din =
new DataInputStream( new FileInputStream( "file.dat" )) )
{
//illustrating readByte() method
byte t=din.readByte();
//illustrating readFloat() method
float u=din.readFloat();
//illustrating readUTF() method
String temp=din.readUTF();
//illustrating readLine() method
String temp1=din.readLine();
System.out.println( "Values: " + t + " " + " " +u+ " " +temp+ " " +temp1 );
//illustrating skipBytes() method
//skipping "AB"
din.skipBytes( 2 );
//illustrating readFully() method
byte [] b= new byte [ 4 ];
din.readFully(b, 0 , 4 );
System.out.println(Arrays.toString(b));
}
catch (FileNotFoundException e)
{
System.out.println( "Cannot Open the Input File" );
return ;
}
}
} |
Output:
Values: 49 4.4545 geeksforgeeks GeeksforGeeks [67, 68, 69, 70]
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