Java - Character isSpaceChar() Method

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The Java Character isSpaceChar() method determines if the specified character is a Unicode space character. A character is considered to be a space character if and only if it is specified to be a space character by the Unicode Standard.

This method returns true if the character's general category type is any of the following −

• SPACE_SEPARATOR

• LINE_SEPARATOR

• PARAGRAPH_SEPARATOR

Syntax

Following is the syntax for Java Character isSpaceChar() method

public static boolean isSpaceChar(char ch)
(or)
public static boolean isSpaceChar(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 a space character, false otherwise.

Example

The following example shows the usage of Java Character isSpaceChar(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 = '\u2028';  // LINE_SEPARATOR

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

      /**
       *  check if ch1, ch2 are space characters
       *  and assign results to b1, b2
       */
      b1 = Character.isSpaceChar(ch1);
      b2 = Character.isSpaceChar(ch2);
      String str1 = "ch1 is a space character is " + b1;
      String str2 = "ch2 is a space 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 −

ch1 is a space character is true
ch2 is a space character is true

Example

The following example shows the usage of Java Character isSpaceChar(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 = 0x2029; // PARAGRAPH_SEPARATOR
      cp2 = 0x1010;

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

      /**
       *  check if cp1, cp2 represent space characters
       *  and assign results to b1, b2
       */
      b1 = Character.isSpaceChar(cp1);
      b2 = Character.isSpaceChar(cp2);
      String str1 = "cp1 represents a space character is " + b1;
      String str2 = "cp2 represents a space 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 represents a space character is true
cp2 represents a space character is false

Example

The example below demonstrates how to check whether a character sequence, or a string, contains a space character. This is done by using loop and conditional statements.

import java.lang.*;
public class SpaceCharDemo {
   public static void main(String []args){
      String s = "Hello World";
      int count = 0;
      for(int i = 0; i < s.length(); i++) {
         char ch = s.charAt(i);
         if(Character.isSpaceChar(ch)) {
            System.out.println("The Space char is found at index " + i);
            count = count + 1;
         }
      }
      if(count == 0)
         System.out.println("The Space char is not found");
   }
}

Output

Once the program above is compiled and run, the output will be printed as −

The Space char is found at index 5

Example

In another example, we will input a character sequence including a code point of the line separator and using this method, we find at which index the line separator is at.

import java.lang.*;
public class SpaceCharDemo {
   public static void main(String []args){
      String s = "Tutorials" + '\u2028' + "point";
      for(int i = 0; i < s.length(); i++) {
         char ch = s.charAt(i);
         if(Character.isSpaceChar((int)ch)) {
            System.out.println("The Space char is found at index " + i);
         }
      }
   }
}

Output

Once the program is compiled and run, the output will be obtained as follows −

The Space char is found at index 9