Checks if a String is whitespace, empty ("") or null - Java java.lang

Description

Checks if a String is whitespace, empty ("") or null

Demo Code

public class Main{

    public static void main(String[] argv){
        String str = "java2s.com";
        System.out.println(isBlank(str));
        /*from ww w .j ava  2s .  c om*/
        str = "";
        System.out.println(isBlank(str));
        
        str = "null";
        System.out.println(isBlank(str));
    }
    /**
     * Checks if a String is whitespace, empty ("") or null.
     * 
     * @param str
     *            the String to check, may be null
     * @return true if the String is null, empty or whitespace
     */
    public static boolean isBlank(String str) {
        return (str == null || str.trim().length() == 0);
    }

}

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