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Tip of the Day
Language: Java
Expertise: Beginner
Dec 13, 2002

Avoid NullPointerException Comparing Strings


The standard way to compare a variable String to a constant is to use this syntax:
 
if(myString.equals("test")){
  doSomething();
}

However, if myString is null, a NullPointerException will be thrown.

Instead, use:
 
if("test".equals(myString)){
  doSomething();
}

If myString is null, the comparison will return false rather than an Exception.
Chris Williams
 
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