Q 10, Self test, K and B.

[K Raj Kumar]

Hi Ranchers,

class Box{
int size;
Box(int s) { size=s :wink: 
}
public class Laser{
 public static void main(String[] args){
 Box b1= new Box[5];
 Box[] ba= go(b1, new Box(6));
 ba[0]= b1;
for(Box b: ba) System.out.print(b.size + " ");
}
static Box[] go(Box b1, Box b2) {
b1.size=4;
Box[] ma= {b2,b1);
return ma;
}
}

Output: 4 4

Source: SCJP 6.0 guide(K and B), page 274.
Please help me in understanding the output.
Thanks in advance.

[jean-gobert de coster]

well, b1 has a size of 5 and b2 has a size of 6, then the go method modified b1 so its size is 4 and then returned a Box[] containing {b2, b1}

then ma[0] = b1 so this is the same as saying b2 = b1

so b1.size = 4 and b2.size = 4, hence the output

[K Raj Kumar]

Thanks Jean..