Thursday, March 31, 2005
Java: Object Array Casting
Here is one interesting problem which I confronted in Java yesterday.
Well I was thinking I knew Java Language reasonably, but yesterday I ran into this issue which has left me pondering what is my level of proficiency in Java?!
Here goes the problem
String[] s={"Hello","There"};
Object[] o=(String[]) s;
for(int i=0; i
Looks simple enough! but was shocked to find out that the above simple code resulted in an Exception - ClassCastException!!
Aren't those simple casts allowed? After all casting is a method which comes Handy many a times esp. in RTTI. I was wondering "How Come?"
At the end googled and found that array casting from object to another is not possible in Java. Means to say that all Strings are Objects, so go ahead and cast String to an Object. But all String arrays are not Object arrays. You can individually cast all member but not as a whole!
Interesting learning for me this one, even though I think this just one the primitive things which I have conveniently ignored.
Well I was thinking I knew Java Language reasonably, but yesterday I ran into this issue which has left me pondering what is my level of proficiency in Java?!
Here goes the problem
String[] s={"Hello","There"};
Object[] o=(String[]) s;
for(int i=0; i
Looks simple enough! but was shocked to find out that the above simple code resulted in an Exception - ClassCastException!!
Aren't those simple casts allowed? After all casting is a method which comes Handy many a times esp. in RTTI. I was wondering "How Come?"
At the end googled and found that array casting from object to another is not possible in Java. Means to say that all Strings are Objects, so go ahead and cast String to an Object. But all String arrays are not Object arrays. You can individually cast all member but not as a whole!
Interesting learning for me this one, even though I think this just one the primitive things which I have conveniently ignored.
# posted by arunsark : 10:05 AM
Comments:
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1) Am not able to create a userId here - says userId doesnt exist when i try to sign in.
2)
String[] s={"Hello","There"};
Object o=(String[]) s;
In Java, any Array can be case to an object (not an object array). Please check u'r inbox for snarayanaswamy@inautix.com - if u havent deleted it.
P.N.Subramanian.
2)
String[] s={"Hello","There"};
Object o=(String[]) s;
In Java, any Array can be case to an object (not an object array). Please check u'r inbox for snarayanaswamy@inautix.com - if u havent deleted it.
P.N.Subramanian.
# posted by 
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# posted by : 3:56 AM
: 3:56 AM<< Home
