is Empty Strictly, space, tab new line are counted as string - Java java.lang

Description

is Empty Strictly, space, tab new line are counted as string

Demo Code

public class Main{

    public static void main(String[] argv){
        String str = "java2s.com";
        System.out.println(isEmptyStrict(str));
    }/*w  w  w .j  av  a  2 s  . c  o m*/

    public static boolean isEmptyStrict(String str) {
        if (isEmpty(str)) {
            return true;
        }

        for (int i = 0; i < str.length(); i++) {
            char c = str.charAt(i);
            if (c != ' ' && c != '\t' && c != '\r' && c != '\n') {
                return false;
            }
        }
        return true;
    }

    public static boolean isEmpty(String str) {
        return str == null || str.trim().length() == 0
                || str.trim().equalsIgnoreCase("null");
    }

}

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