JDBM put() then get() needs type casting?

[dlite922]

Hey fellas, long time PHP programmer (yes you can roll your eyes) trying to do Java. Although I initially came from C++ and Java programming to PHP, I'm having trouble grasping a concept:

I'm creating a jdbm hash table and putting in a String[] as the value, but when I try to get() it, it returns type Object and does not like being casted back to String[]. What is going on and why not?

 
hashtable = HTree.createInstance( recman );
.
.
.
String[] test= {"test hard, testhard2", "romeo must test", "live rich or test trying"};
String[] romeo = {"romeo must die","romeo and juliet","romeo and juliet 2"};
hashtable.put( "die", die );
hashtable.put( "die", romeo );
.
.
.
// Error Line: 
String[] titleArr = hashtable.get("die");
 
Error: Uncompilable source code - incompatible types
 
 
 

I've tried putting (String[]) explicit cast in front of the get, but still errors as saying:

java.lang.String cannot be cast to [Ljava.lang.String

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FIXED before I finished my post, for anyone else who has the same issue. Experts, comments/feedback are welcome.

Explanation of my bug:
I was using an existing jdbm file that already had these keys with String values, not an array. recreated it and then the explicit casting worked. But I didn't use String[] anymore I used java.util.HashSet because my lists could get pretty large.

Thanks,




Dan

[JosAH]

You have to learn how to read those internal class names; the following list was bluntly stolen from the description of the Class.getName() method:

boolean Z
byte B
char C
class or interface Lclassname;
double D
float F
int I
long J
short S

If you read that error message again you'd see what had happened.

kind regards,

Jos