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== Noncompliant Code Example

----
if ( a == a ) { // always true
  doZ();
}
if ( a != a ) { // always false
  doY();
}
if ( a == b && a == b ) { // if the first one is true, the second one is too
  doX();
}
if ( a == b || a == b ) { // if the first one is true, the second one is too
  doW();
}

int j = 5 / 5; //always 1
int k = 5 - 5; //always 0

c.equals(c); //always true
----

== Exceptions

* This rule ignores ``++*++``, ``+``, and ``++=++``. 
* The specific case of testing a floating point value against itself is a valid test for ``++NaN++`` and is therefore ignored.
* Similarly, left-shifting 1 onto 1 is common in the construction of bit masks, and is ignored.


----
float f;
if(f != f) { //test for NaN value
  System.out.println("f is NaN");
}

int i = 1 << 1; // Compliant
int j = a << a; // Noncompliant
----

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== Comments And Links
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