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Is there an externally observable difference between following programs? 
<source lang="java">
public static String sayHello() {
  return "Hello World!";
}
</source>
<source lang="java">
public static String sayHello() {
  String s1 = "Hello";
  String s2 = " World!";
  return s1 + s2;
}
</source>

Of course, there is! Just call the method twice:

<source lang="java">
  assert sayHello() == sayHello();
</source>

The first version of the method passes the [[IdentityCheck]] test. The second does not. There are also other differences in [[MemoryAllocations]] as well as [[StringsUsedInConstantPool]].

[[Category:APITypes]]

Return to IdentityCheck.

Retrieved from "http://wiki.apidesign.org/wiki/IdentityCheck"

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