Java Utililty Methods String Empty

String coerceValueIfNullOrEmpty(String s, String valueIfNullOrEmpty)
Use this when you want to normalize empty and null strings This way, Utility.areObjectsEqual can used for comparison, where a null string is to be treated the same as an empty string.

if (isNullOrEmpty(s)) {
 return valueIfNullOrEmpty;
return s;

String emptyString()
Return an empty String (immutable).

return EMPTY_STRING;

String emptyString(final String a, final String defaultString)
empty String

return a != null && a.length() > 0 ? a : defaultString;

boolean emptyString(final String string)
Check if a string is null , empty or contains only whitespaces.

if (string == null)
 return true;
if (string.length() < 1)
 return true;
if (string.matches("\\s+"))
 return true;
return false;

boolean emptyString(Object s)
*

return ((s == null) || ((s instanceof String) && s.equals("")));

boolean emptyString(String s)

return s == null || s.matches("(\\s)*");

boolean emptyString(String s)
Tests if a string is empty.

boolean expr = (s == null || s.length() == 0);
return expr;

boolean emptyString(String str)
Verifica se a string esta nula ou vazia

return str == null || str.trim().length() == 0;

boolean emptyString(String str)
empty String

return str == null || str.trim().length() == 0;

String emptyString2Null(String stringValue)
empty String Null

if (stringValue != null && stringValue.length() == 0) {
 return null;
return stringValue;