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Java DataOutputStream writeLong() Method with Example

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

DataOutputStream Class writeLong() method

  • writeLong() method is available in package.
  • writeLong() method is used to write the given long value to the basic DataOutputStream as 8 bytes (i.e. 64 bit) and the variable counter is plus by 8 on successful execution.
  • writeLong() 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.
  • writeLong() method may throw an exception at the time of writing long.
    IOException: This exception may throw while getting any input/output error.


    public final void writeLong(long val);


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

Return value:

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


// Java program to demonstrate the example 
// of void writeLong(long val) method 
// of DataOutputStream

public class GetSignersOfClass {
 public static void main(String[] args) throws Exception {
  // Creating an instance of String
  String str = new String();

  // It returns the Class object represented by the String class
  // object
  Class cl = str.getClass();

  // By using getSigners() method is to get the signers of the Class
  Object[] o = cl.getSigners();
  System.out.println(cl.getName() + " " + "Signers :" + o);


java.lang.String Signers :null


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