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casting error (K&B)

Rajesh Chandra
Ranch Hand

Joined: Jun 13, 2005
Posts: 55
Hi Pals,
I found this question at a mock test from (K&B)K&B Mock

Q5-
class Eggs {
int doX(Long x, Long y) { return 1; }
int doX(long... x) { return 2; }
int doX(Integer x, Integer y) { return 3; }
int doX(Number n, Number m) { return 4; }

public static void main(String[] args) {
new Eggs().go();
}
void go() {
short s = 7;
System.out.print(doX(s,s) + " ");
System.out.println(doX(7,7));
}
}

What is the result?

A). 1 1
B). 2 1
C). 3 1
D). 4 1
E). 1 3
F). 2 3
G). 3 3
H). 4 3

The answer given is H.Isnt it wrong for how primitives can be implicitly casted to Wrappers? it should have been compile time error.
regs
Rajesh
[ October 29, 2005: Message edited by: Rajesh Chandra ]
Bert Bates
author
Sheriff

Joined: Oct 14, 2002
Posts: 8815
    
    5
Hey Rajesh,

Can you give a little more detail about what you think is wrong?

Thanks,

Bert


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(If you're not on the edge, you're taking up too much room.)
Rajesh Chandra
Ranch Hand

Joined: Jun 13, 2005
Posts: 55
Hi Bert,
Well the calling method doX(s,s) and doX(7,7) has no counterpart methods with required arguments to call.How can doX(s,s) call int doX(Number n, Number m) and doX(7,7) call doX(Integer x, Integer y) ?? Anyway I get this compile time error



C:\j2sdk1.4.1\bin>javac Eggs.java
Eggs.java:12: cannot resolve symbol
symbol : method doX (short,short)
location: class Eggs
System.out.print(doX(s,s) + " ");
^
Eggs.java:13: cannot resolve symbol
symbol : method doX (int,int)
location: class Eggs
System.out.println(doX(7,7));
^
2 errors

Im at loss whats happening here.
Thanks
Rajesh
Bert Bates
author
Sheriff

Joined: Oct 14, 2002
Posts: 8815
    
    5
Hey Rajesh,

It seems that you're using a Java 1.4 compiler, not a Tiger compiler. The mock questions that we posted are meant to be testing your knowledge of the Tiger compiler, not the 1.4 compiler.

hth,

Bert
Rajesh Chandra
Ranch Hand

Joined: Jun 13, 2005
Posts: 55
thanks ! indeed Im using java1.4.So theres huge turnaround in java1.5??
Never expected this.Anyway thanks again
regs
Rajesh
 
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