Java - Character isISOControl() Method

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The Java Character isISOControl() method checks whether 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 with a char type argument is not valid for supplementary characters so we pass the Unicode code point, which is of int data type, to make it applicable for supplementary characters as well.

Note − This method is available in two polymorphic forms.

Syntax

Following is the syntax for Java Character isISOControl() method

public static boolean isISOControl(char ch)
(or)
public static boolean isISOControl(int codePoint)

Parameters

• ch − the character to be tested

• codePoint − the Unicode code point to be tested

Return Value

This method returns true if the character is an ISO control character, otherwise false.

Example

The following example shows the usage of Java Character isISOControl(char ch) method.

package com.tutorialspoint;
import java.lang.*;
public class CharacterDemo {
   public static void main(String[] args) {

      // create 2 char primitives ch1, ch2
      char ch1, ch2;

      // assign values to ch1, ch2
      ch1 = ':';
      ch2 = '\u0013';

      // create 2 boolean primitives b1, b2
      boolean b1, b2;

      // assign isISOControl results of ch1, ch2 to b1, b2
      b1 = Character.isISOControl(ch1);
      b2 = Character.isISOControl(ch2);
      String str1 = ch1 + " is an ISO control character is " + b1;
      String str2 = "ch2 is an ISO control character is " + b2;

      // print b1, b2 values
      System.out.println( str1 );
      System.out.println( str2 );
   }
}

Output

Let us compile and run the above program, this will produce the following result −

: is an ISO control character is false
ch2 is an ISO control character is true

Example

The following example shows the usage of Java Character isISOControl(int codePoint) method.

package com.tutorialspoint;
import java.lang.*;
public class CharacterDemo {
   public static void main(String[] args) {

      // create 2 int primitives cp1, cp2
      int cp1, cp2;

      // assign values to cp1, cp2
      cp1 = 0x008f;
      cp2 = 0x0123;

      // create 2 boolean primitives b1, b2
      boolean b1, b2;

      // assign isISOControl results of cp1, cp2 to b1, b2
      b1 = Character.isISOControl(cp1);
      b2 = Character.isISOControl(cp2);
      String str1 = "cp1 is an ISO control character is " + b1;
      String str2 = "cp2 is an ISO control character is " + b2;

      // print b1, b2 values
      System.out.println( str1 );
      System.out.println( str2 );
   }
}

Output

Let us compile and run the above program, this will produce the following result −

cp1 is an ISO control character is true
cp2 is an ISO control character is false

Example

Since the method's return values are of type Boolean, it can be used as a condition for a conditional statement.

In the following example, we initialize a char variable and pass it as an argument to the method. The return value of this method is considered to be the result of the condition in an if-else statement.

import java.lang.*;
public class Demo {
   public static void main(String[] args) {
      char c = '\u0012';
      if(Character.isISOControl(c))
         System.out.println("The character is an ISO Control");
      else
         System.out.println("The character is not an ISO Control");
   }
}

Output

Upon compiling and running the program above, the output is obtained as −

The character is an ISO Control

Example

In another example, we will use conditional statements to understand the usage of this method for non-ISO control characters.

import java.lang.*;
public class Demo {
   public static void main(String[] args) {
      char c = '\u0026';
      if(Character.isISOControl(c))
         System.out.println("The character is an ISO Control");
      else
         System.out.println("The character is not an ISO Control");
   }
}

Output

Upon compiling and running the program above, the output is obtained as −

The character is not an ISO Control