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In this noncompliant code example, class Foo declares a field whose value represents the version of the software. The field is subsequently accessed by class Bar from a separate compilation unit.

Foo.java:

class Foo {
  static public final int VERSION = 1;
  // ...
}

Bar.java:

class Bar {
  public static void main(String[] args) {
    System.out.println("You are using version " + Foo.VERSION);
  }
}

...

class Bar {
  public static void main(String[] args) {
    System.out.println("You are using version " + Foo.getVersion());
  }
}

The As a result, the private version value can therefore not cannot be copied into the Bar class when it is compiled, thus consequently preventing the bug. Note that most JITs are capable of inlining the getVersion() method at runtime; consequently there is little or no performance penalty incurred.

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