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  • java - How to check if my string is equal to null? - Stack . . .
    If myString is in fact null, then any call to the reference will fail with a Null Pointer Exception (NPE) Since java 6, use #isEmpty instead of length check (in any case NEVER create a new empty String with the check)
  • Java Program to Check if a String is Empty or Null
    It checks it using a null check using != null and isEmpty() method of string In plain terms, if a string isn't a null and isEmpty() returns false , it's not either null or empty Else, it is
  • java - How to check a string is not null? - Stack Overflow
    Be sure to use the parts of in this order, because java will not proceed to evaluating the the second if the first part of fails, thus ensuring you will not get a null pointer exception from str isEmpty() if str is null
  • Java null check why use == instead of . equals() - Stack . . .
    They're two completely different things == compares the object reference, if any, contained by a variable equals() checks to see if two objects are equal according to their contract for what equality means It's entirely possible for two distinct object instances to be "equal" according to their contract
  • java - Check whether a string is not null and not empty . . .
    You should probably use PreparedStatement and such instead of constructing an SQL query by string concatenation primitives Avoids all kinds of injection vulnerabilities, much more readable, etc – polygenelubricants Aug 30 '10 at 8:09
  • Java null String equals result - Stack Overflow
    To check if a string is null, use == rather than equals Although result1 and result3 will not be set due to NullPointerExceptions, result2 would be false (if you ran it outside the context of the other results)
  • How to compare String with null ?? (Java in General forum . . .
    prints "null" instead of ""; If this is written to a file and subsequently read back in, suddenly the String is "null" instead of null (or "", depending on how things get read in) Looks like this is the case as I am using Tomcat inside the eclipse
  • How do perform a Null check for string in Java? - Quora
    4 Ways to check if String is null or empty in Java:-Here are my four solutions for this common problem Each solution has their pros and cons and a special use case e g first solution can only be used from JDK7 on wards, second solution is the fastest way to check string is empty and third solution should be used if your string contains whitespaces

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