StringUtils.isEmpty() vs StringUtils.isBlank()

StringUtils.isEmpty() vs StringUtils.isBlank()

  March 03, 2014    Hash

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StringUtils.isEmpty() is used to find if the String is length 0 or null.

StringUtils.isBlank() takes it a step forward. It not only checks if the String is length 0 or null, but also checks if it is only a whitespace string, i.e. "\s*".

To Quote the API

1) isEmpty

public static boolean isEmpty(String str)
Checks if a String is empty ("") or null.

StringUtils.isEmpty(null) = true
StringUtils.isEmpty("") = true
StringUtils.isEmpty(" ") = false
StringUtils.isEmpty("bob") = false
StringUtils.isEmpty(" bob ") = false

NOTE: This method changed in Lang version 2.0. It no longer trims the String. That functionality is available in isBlank().

2) isBlank

public static boolean isBlank(String str)
Checks if a String is whitespace, empty ("") or null.

StringUtils.isBlank(null) = true
StringUtils.isBlank("") = true
StringUtils.isBlank(" ") = true
StringUtils.isBlank("bob") = false
StringUtils.isBlank(" bob ") = false

Since:
2.0