java.lang.Character isISOControl(char ch)


The Character.isISOControl(char ch) java method determines if the specified character is an ISO control character. A character is considered to be an ISO control character if its code is in the range ‘u0000’ through ‘u001F’ or in the range ‘u007F’ through ‘u009F’.

This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the isISOControl(int) method.

The isISOControl(char ch) method of Character class is static thus it should be accessed statically which means the we would be calling this method in this format:

Character.isISOControl(char ch)

Non static method is usually called by just declaring method_name(argument) however in this case since the method is static, it should be called by appending the class name as suffix. We will be encountering a compilation problem if we call the java isISOControl() method non statically.

Method Syntax

public static boolean isISOControl(char ch)

Method Argument

Data Type Parameter Description
char ch the character to be tested.

Method Returns

The the character to be tested. method of Character class returns true if the character is an ISO control character; false otherwise.


Requires Java 1.1 and up

Java Character isISOControl(char ch) Example

Below is a simple java example on the usage of isISOControl(char ch) method of Character class.


import java.util.Scanner;

 * This example source code demonstrates the use of 
 * isISOControl(char ch) method of Character class.

public class CharacterIsISOControlCharExample {

	public static void main(String[] args) {

		// Ask for user input
		System.out.print("Enter an input:");

		// use scanner to get the user input
		Scanner s = new Scanner(;

		// gets the user input
		char[] value = s.nextLine().toCharArray();

		// close the scanner object

		// check if user input is an ISO control character
		for (char ch : value) {
			boolean result = Character.isISOControl(ch);
			// print the result
				System.out.println("character " + ch 
						+ " is an ISO control character? " + result);
				System.out.println("character " + ch 
						+ " is not an ISO control character? " + result);



Sample Output

Below is the sample output when you run the above example.

java Character isISOControl(char ch) example output