Hi,
I’ve been twisting over this for 3nights now and I’m officially in groundhog day. I’m working though Headfirst java, and I’ve come across a piece of code that I just cant understand – it’s from an excersise where you’re meant to figure out the output, so here it is inc output, and I’ll explain what I do & don’t get, any help would be so so so much appreciated, I might cry if I actually understand. I’ve even had a dream about this. seriously… need… help…
~~~~~~~~~~~~~~~~~~~~~~~~~~~
public class Mix4 {
int counter = 0;
public static void main(String [] args) {
int count + 0
Mix4 [] m4a = new Mix4[20];
Int x = 0;
while (x<9) {
m4a[x] = new Mix4();
m4a.counter = m4a[x].counter + 1
count = count + 1
count = count + m4a[x].maybeNew(x)
x = x + 1
}
System.out.println(count + “ “
+ m4a[1].counter);
}
public int maybeNew(int index) {
if (index<5) {
Mix4 m4 = new Mix4();
m4.counter = m4.counter + 1;
return 1;
}
return 0;
}
}
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
output is:
14 1
so I understand the maybenew method takes the int index arguement which is passed as x which is declared as 1, which is less than 5, therefore the return value is 1. 1 array and 1 object created from class….
I guess I’d like to know how the compiler reads this code, how those output values (count + m4a[1].counter)
are arrived at, the addition of what iterations in which loop, what numbers when? Basically, can anyone could help walk me through how that output was computed?
Thanks for reading
