Question

How to determine if a character is whitespace in Java

Answer 1

package javaapplication1;
 
public class JavaApplication1 {
 
    public static void main(String[] args) {
 
        char ch = 'a';

        boolean b;
        
        b = Character.isWhitespace(ch);
        System.out.println(b);
        
        System.out.println(Character.isWhitespace(' '));
        System.out.println(Character.isWhitespace('\t'));
        System.out.println(Character.isWhitespace('\n'));
        
    }
}
 
/*
run:

false
true
true
true
 
*/

 

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Answer 2

package javaapplication1;

public class JavaApplication1 {

    public static void main(String[] args) {

        try {

            char ch = 'a';
            if (Character.isWhitespace(ch)) {
                System.out.println("yes");
            } else {
                System.out.println("no");
            }

            ch = ' ';
            if (Character.isWhitespace(ch)) {
                System.out.println("yes");
            } else {
                System.out.println("no");
            }

            ch = '\n';
            if (Character.isWhitespace(ch)) {
                System.out.println("yes");
            } else {
                System.out.println("no");
            }

            ch = '\t';
            if (Character.isWhitespace(ch)) {
                System.out.println("yes");
            } else {
                System.out.println("no");
            }

        } catch (Exception e) {
            System.out.print(e.toString());
        }
    }

    static boolean check4(String s) {
        return s.length() <= 4;
    }
}

/*
              
run:
 
no
yes
yes
yes
     
 */

 

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