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The C# IsNullOrEmpty() method is used to check whether the specified string is null or an Empty string. It returns a boolean value either true or false.
The isEmpty() method checks whether a string is empty or not. This method returns true if the string is empty (length() is 0), and false if not.
isEmpty(<string>) Checks if the <string> value is an empty string containing no characters or whitespace. Returns true if the string is null or empty.
StringUtils.isEmpty(str) or StringUtils.isNotEmpty(str)
StringUtils.isBlank(str) or StringUtils.isNotBlank(str)
from Apache commons-lang.
The difference between empty and blank is : a string consisted of whitespaces only is blank but isn't empty.
I generally prefer using apache-commons if possible, instead of writing my own utility methods, although that is also plausible for simple ones like these.
If you are doing android development, you can use:
TextUtils.isEmpty (CharSequence str)
Added in API level 1 Returns true if the string is null or 0-length.
com.google.common.base.Strings.isNullOrEmpty(String string) from Google Guava
No, which is why so many other libraries have their own copy :)
You can add one
public static boolean isNullOrBlank(String param) {
return param == null || param.trim().length() == 0;
}
I have
public static boolean isSet(String param) {
// doesn't ignore spaces, but does save an object creation.
return param != null && param.length() != 0;
}
To check if a string got any characters, ie. not null or whitespaces, check StringUtils.hasText-method (if you are using Spring of course)
Example:
StringUtils.hasText(null) == false
StringUtils.hasText("") == false
StringUtils.hasText(" ") == false
StringUtils.hasText("12345") == true
StringUtils.hasText(" 12345 ") == true
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