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org.sonar.l10n.java.rules.squid.S1697.html Maven / Gradle / Ivy

When either the equality operator in a null test or the logical operator that follows it is reversed, the code has the appearance of safely null-testing the object before dereferencing it. Unfortunately the effect is just the opposite - the object is null-tested and then dereferenced only if it is null, leading to a guaranteed null pointer dereference.
Compliant Solution

if (str == null || str.length() == 0) {
  System.out.println("String is empty");
}

if (str != null && str.length() > 0) {
  System.out.println("String is not empty");
}