Character.isWhitespace() method in Java with examples

Last Updated : 06 Dec, 2018

The java.lang.Character.isWhitespace() is an inbuilt method in a java that determines if the specified character (Unicode code point) is white space according to Java. A character is a Java whitespace character if and only if it satisfies one of the following criteria:

It is a Unicode space character (SPACE_SEPARATOR, LINE_SEPARATOR, or PARAGRAPH_SEPARATOR) but is not also a non-breaking space ('\u00A0', '\u2007', '\u202F').
It is '\t', U+0009 HORIZONTAL TABULATION.
It is '\n', U+000A LINE FEED.
It is '\u000B', U+000B VERTICAL TABULATION.
It is '\f', U+000C FORM FEED.
It is '\r', U+000D CARRIAGE RETURN.
It is '\u001C', U+001C FILE SEPARATOR.
It is '\u001D', U+001D GROUP SEPARATOR.
It is '\u001E', U+001E RECORD SEPARATOR.
It is '\u001F', U+001F UNIT SEPARATOR.

Syntax:

public static boolean isWhitespace(datatype character)

Parameters: The function accepts one mandatory parameter character. This parameter can be of datatype int or char. It specifies the character to be tested. Return value: This method returns true if the character is a Java whitespace character, false otherwise. Below programs illustrate the Character.isWhitespace(char ch) method: Program 1:

Java

// Java program to illustrate the Character.isWhitespace()
// method when the passed parameter is a character
import java.lang.*;

public class gfg {

    public static void main(String[] args)
    {

        // create 2 char primitives c1, c2
        char c1 = '*', c2 = '\f';

        boolean b1 = Character.isWhitespace(c1);
        boolean b2 = Character.isWhitespace(c2);

        String str1 = "c1 is a Java whitespace character is " + b1;
        String str2 = "c2 is a Java whitespace character is " + b2;

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

Output:

c1 is a Java whitespace character is false
c2 is a Java whitespace character is true

Program 2:

Java

// Java program to demonstrate the Character.isWhitespace()
// method when the passed parameter is a character
import java.lang.*;

public class gfg {

    public static void main(String[] args)
    {

        // create 2 char primitives c1, c2
        char c1 = '/', c2 = '\f';

        boolean b1 = Character.isWhitespace(c1);
        boolean b2 = Character.isWhitespace(c2);

        String str1 = "c1 is a Java whitespace character is " + b1;
        String str2 = "c2 is a Java whitespace character is " + b2;

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

Output:

c1 is a Java whitespace character is false
c2 is a Java whitespace character is true

Program 3: When the parameter is of type int.

Java

// Java program to demonstrate the
// Character.isWhitespace()
// method when the passed parameter
// is a character
import java.lang.*;

public class gfg {

    public static void main(String[] args)
    {

        // create 2 int primitives c1, c2
        int c1 = 0x451c, c2 = 0x4abc;

        boolean b1 = Character.isWhitespace(c1);
        boolean b2 = Character.isWhitespace(c2);

        String str1 = "c1 represents Java whitespace character is " + b1;
        String str2 = "c2 represents Java whitespace character is " + b2;

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

Output:

c1 represents Java whitespace character is false
c2 represents Java whitespace character is false

Program 4: When the parameter is of type int.

Java

// Java program to demonstrate the Character.isWhitespace()
// method when the passed parameter is a character
import java.lang.*;

public class gfg {

    public static void main(String[] args)
    {

        // create 2 int primitives c1, c2
        int c1 = 0x001c, c2 = 0x1bbc;

        boolean b1 = Character.isWhitespace(c1);
        boolean b2 = Character.isWhitespace(c2);

        String str1 = "c1 represents Java whitespace character is " + b1;
        String str2 = "c2 represents Java whitespace character is " + b2;

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

Output:

c1 represents Java whitespace character is true
c2 represents Java whitespace character is false

Character.isLowSurrogate() method in Java with examples

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Character.isWhitespace() method in Java with examples

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