Is jdk1.4 jar files will be executed in 1.5 environment.

[lokesh pattajoshi]

Hi everybody,
i have a jar file which is executed in jdk1.4 platform can i be able to run it on jdk1.5 and jdk1.3
your answer is appreciated.


Regards
Lokesh Kumar Pattajoshi

[John de Michele]

Lokesh:

It's hard to say with so little information. What are you trying to do? Do classes in your .jar use any 1.4+ APIs (that will certainly prevent usage in a JDK 1.3 environment)?

John.

[Ulf Dittmer]

Java is backwards compatible, so a Java 5 environment should have no problem executing code that has been written for Java 1.4. Java 1.3, on the other hand, very likely will be unable to run that code, but that's so old and obsolete that nobody should be using it any more.

[Campbell Ritchie]

Don't recompile the code because there might be changes if you have anything which might box or unbox primitive values; this example might behave differently in Java 1.4 from in Java5.

private byte b = 123;
 . . .
public void foo(int i)
{
 . . .
}
 . . .
public void foo(Object o)
{
 . . .
}
 . . 
someObject.foo(b);