log.txt

$ javac -version -source 1.5 -target 1.5 Test.java 
javac 1.5.0_22
Test.java:7: method does not override a method from its superclass
    @Override
     ^
1 error

$ javac -version -source 1.5 -target 1.5 Test.java
javac 1.6.0_30

$ javap Test -v
Compiled from "Test.java"
public class Test extends java.lang.Object
  SourceFile: "Test.java"
  InnerClass: 
   public #9= #3 of #7; //MyClass=class Test$MyClass of class Test
   public abstract #12= #11 of #7; //MyInterface=class Test$MyInterface of class Test
  minor version: 0
  major version: 49

$ java -version
java version "1.5.0_22"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_22-b03)
Java HotSpot(TM) Server VM (build 1.5.0_22-b03, mixed mode)

$ java Test
Hello world!

Test.java

public class Test {
  public interface MyInterface {
    String method();
  }

  public static class MyClass implements MyInterface {
    @Override
    public String method() {
      return "Hello world!";
    }
  }

  public static void main(String[] args) {
    System.out.println(new MyClass().method());
  }
}