Java.io.DataInputStream class in Java | Set 2
Last Updated :
11 Sep, 2023
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Java.io.DataInputStream class in Java | Set 1
More Methods:
Java
Output:
- 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 - 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 - 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 - 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 - 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.
- 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 - 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 - 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 - 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
//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;
}
}
}
//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; } }}Values: 49 4.4545 geeksforgeeks GeeksforGeeks [67, 68, 69, 70]
