StringUtils.defaultString(String str) Returns either the passed in String, or if the String is null, an empty String (""). Example from java doc. ... <看更多>

This tutorial explains the difference between NULL and empty string. ... <看更多>

ID: java/inefficient-empty-string-test Kind: problem Severity: ... but the test user.equals("") throws a NullPointerException if user is null . ... <看更多>

Let's say that the record comes from a form to gather name and address information. Line 2 of the address will typically be blank if the user doesn't live ... ... <看更多>