rspec/rules/S3043/java/rule.adoc

== Why is this an issue?

Perhaps counter-intuitively, a ``++compareTo++`` method is _expected_ to throw a ``++NullPointerException++`` if passed a null argument, and a ``++ClassCastException++`` if the argument is of the wrong type. So there's no need to null-test or type-test the argument.


=== Noncompliant code example

[source,java]
----
public int compareTo(Object obj) {

  if (obj == null) { // Noncompliant
    return -1;
  }
  if (! obj instanceof MyClass.class) { // Noncompliant
    return -1;
  }

  MyObject myObj = (MyObject) obj;
  // ...
}
----


=== Compliant solution

[source,java]
----
public int compareTo(Object obj) {

  MyObject myObj = (MyObject) obj;
  // ...
}
----



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== Implementation Specification
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== Comments And Links
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