Java - Write code to Check that the given CharSequence is neither null nor of length 0.

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Requirements

Write code to Check that the given CharSequence is neither null nor of length 0.

Demo

//package com.book2s;

public class Main {
    public static void main(String[] argv) {
        String str = "book2s.com";
        System.out.println(hasLength(str));
    }/* w w w .  jav a2s.c  o  m*/

    /**
     * Check that the given CharSequence is neither {@code null} nor of length
     * 0. Note: Will return {@code true} for a CharSequence that purely consists
     * of whitespace.
     * <p>
     * 
     * <pre>
     * StringUtils.hasLength(null) = false
     * StringUtils.hasLength("") = false
     * StringUtils.hasLength(" ") = true
     * StringUtils.hasLength("Hello") = true
     * </pre>
     * 
     * @param str
     *            the CharSequence to check (may be {@code null})
     * @return {@code true} if the CharSequence is not null and has length
     */
    public static boolean hasLength(CharSequence str) {
        return (str != null && str.length() > 0);
    }

    /**
     * Check that the given String is neither {@code null} nor of length 0.
     * Note: Will return {@code true} for a String that purely consists of
     * whitespace.
     * 
     * @param str
     *            the String to check (may be {@code null})
     * @return {@code true} if the String is not null and has length
     * @see #hasLength(CharSequence)
     */
    public static boolean hasLength(String str) {
        return hasLength((CharSequence) str);
    }
}

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