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Can we return Byte for a method that has a return type int

 
Greenhorn
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public int getNum(){
Byte b=10;
return b;
}
Byte is not primitive ,it is a wrapper class. in the self test it is given that it shows compiler error. But its not showing any compiler error...
whats the reason???
 
Bartender
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Which compiler you are using? This will compile in JDK 5 or higher.
 
hari vemulapalli
Greenhorn
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Okay Thank you.I am using 1.5. So it will give compiler error in 1.4 only.
 
Vijitha Kumara
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So it will give compiler error in 1.4 only.



anything prior to JDK 5
 
Ranch Hand
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Here which conversion is going on? "byte into int" or "Byte into int"? Can anyone explain how autoboxing and boxing going on here.
 
Java Cowboy
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The Byte object (an instance of the wrapper class Byte) is unwrapped to a primitive byte, and that is automatically converted to int.

Autoboxing didn't exist in Java 1.4, so that's why it doesn't work in Java 1.4.
 
Greenhorn
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Just complementing the answers above, if you want to see the error compile your program with java -source 1.4 (or 1.3 or 1.2) ClassName and you will see the compile error.

Java 5 and above have autoboxing feature and no error will be shown.
 
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