Core Java™ 2 Volume I - Fundamentals, Seventh Edition

Appendix B. Retrofitting JDK 5.0 Code

This book uses JDK 5.0 features in many of its programs. This appendix summarizes the changes that you need to make to the sample programs so that they compile and run with JDK 1.4.

Enhanced for Loop

The enhanced for loop (or “for each” loop) must be turned into a traditional loop.

5.0	1.4
for (type variable : array){   body}	for (int i = 0; i < array.length; i++){   type variable = array[i];   body}
for (type variable : arrayList){   body}	for (int i = 0; i < arrayList.size(); i++){   type variable = (type) arrayList.get(i);   body}

Generic Array Lists

You need to remove the type parameters and add casts to any get operations.

5.0	1.4
ArrayList<Type> arrayList = new ArrayList<Type>()	ArrayList arrayList = new ArrayList(); ...