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  New Collections in 1.5 question  (Read 847 times)
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Offline JuddMan

Senior Member


Medals: 1


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« Posted 2004-07-11 12:28:58 »

what would happen trying to run some code compiled in 1.5 that used the new 'type checking' style collections classes in java 1.4 VM?

ie. Java 1.4:
ArrayList oldList = new ArrayList();
oldList.add("Hello");
oldList.add("there");

Iterator i = oldList.iterator();
while(i.hasNext())
{
   System.out.println((String)(i.next())
}

Java 1.5:
ArrayList<String> newList = new ArrayList<String>();
newList.add("Hello");
newList.add("there");

Iterator i<String> = newList.iterator();
while(i.hasNext())
{
   System.out.println(i.next())
}

seems to me that all it's doing is making sure that you are only putting in a specific type at compile-time, which means you don't have to cast it when you want to use it.
Offline princec

JGO Kernel


Medals: 380
Projects: 3
Exp: 16 years


Eh? Who? What? ... Me?


« Reply #1 - Posted 2004-07-11 14:13:18 »

The 1.5 compiler does 3 things here: 1. it complains if you break the new rules 2. it writes normal JDK1.4 code but inserts casts to String behind the scenes for you 3. it uses a newer classfile version number so it won't work on 1.4 anyway Smiley You have to compile with -target 1.4 to get it to run.

Cas Smiley

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