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Java DataOutputStream writeBoolean() Method with Example

DataOutputStream Class writeBoolean() method: Here, we are going to learn about the writeBoolean() method of DataOutputStream Class with its syntax and example.
Submitted by Preeti Jain, on March 30, 2020

DataOutputStream Class writeBoolean() method

• writeBoolean() method is available in java.io package.
• writeBoolean() method is used to write the given boolean byte to the basic output stream so the variable counter is written is plus 1 on successful execution.
• writeBoolean() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• writeBoolean() method may throw an exception at the time of writing boolean.
  IOException: This exception may throw while getting any input/output error.

Syntax:

    public final void writeBoolean(boolean val);

Parameter(s):

• boolean val – represents the boolean value to be written to the basic data output stream.

Return value:

The return type of the method is void, it returns nothing.

Example:

// Java program to demonstrate the example 
// of void writeBoolean(boolean val) method 
// of DataOutputStream

import java.io.*;

public class WriteBooleanOfDOS {
 public static void main(String[] args) throws Exception {
  ByteArrayOutputStream baos_stm = null;
  DataOutputStream dos_stm = null;

  boolean[] bool = {
   false,
   false,
   true,
   false
  };

  try {
   // Instantiates ByteArrayOutputStream, DataOutputStream
   baos_stm = new ByteArrayOutputStream();
   dos_stm = new DataOutputStream(baos_stm);

   for (boolean val: bool) {
    // By using writeBoolean() method isto write
    // boolean value from the given bool array
    // to the dos_stm stream i.e. o represents
    // false and 1 represents true
    dos_stm.writeBoolean(val);
   }

   // By using toByArray() method isto
   // convert the stream baos_stm to byte 
   // array
   byte[] by = baos_stm.toByteArray();

   // Loop to display each byte to the
   // baos_stm data till its end

   for (byte val: by) {
    // Display byte
    System.out.println("dos_stm.writeBoolean(): " + val);
   }
  } catch (Exception ex) {
   System.out.println(ex.toString());
  } finally {
   // this block is to free all necessary system 
   // resources linked with the stream

   if (baos_stm != null)
    baos_stm.close();

   if (dos_stm != null)
    dos_stm.close();
  }
 }
}

Output

dos_stm.writeBoolean(): 0
dos_stm.writeBoolean(): 0
dos_stm.writeBoolean(): 1
dos_stm.writeBoolean(): 0