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Java Formatter ioException() Method with Example

Formatter Class ioException() method: Here, we are going to learn about the ioException() method of Formatter Class with its syntax and example.
Submitted by Preeti Jain, on February 14, 2020

Formatter Class ioException() method

  • ioException() method is available in java.util package.
  • ioException() method is used to get the IOException last thrown by this Formatter's Appendable append() method otherwise it returns null.
  • ioException() method is a non-static method, it is accessible with the class object and if we try to access the method with the class name then we will get an error.
  • ioException() method does not throw an exception at the time of none exception existence.


    public IOException ioException();


  • It does not accept any parameter.

Return value:

The return type of this method is IOException, it gets last exception when it is thrown by appendable otherwise it gets null when none exception exists.


// Java program is to demonstrate the example of
// ioException() method of Formatter

import java.util.*;

public class IOExceptionOfFormatter {
    public static void main(String[] args) {
        // Instantiates a StringBuffer and Formmatter object
        StringBuffer sb = new StringBuffer();
        Formatter formatt = new Formatter(sb, Locale.UK);

        // By using format() method is to format a string
        formatt.format("Hi %s !", "IncludeHelp");

        // Display Formatted String

        // By using ioException() method is to
        // return the last exception thrown by
        // this Formatter
        System.out.println("formatt.ioException(): " + formatt.ioException());


Hi IncludeHelp !
formatt.ioException(): null

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