// plain import in Java 1.4+
import com.mypackage.MyClassOfConstants;

// import static in Java 1.5
import static com.mypackage.MyClassOfConstants.*;

...

// instead of Java 1.4+ way:
int n = MyClassOfConstants.LONGEST_NAME;

// you can now abbreviate that in Java 1.5 to
int n = LONGEST_NAME;