Java Initialize Variable Extension

Question

Is it possible to initialize a global variable with an increment of another global variable?

Example:

int a=0; 
int b=a++; 
int c=a++; 
int d=a++;

This should output:

0,1,2,3

Could it happen that the compiler could read the global value before another?

+3

user2469133 Apr 29. 15 at 15:14

2 answers

Luiggi mendoza · Answer 1 · 2015-04-29T15:17:31+0000

It will behave as expected. If you try to use a field before defining it, the compiler throws an error:

public class Foo {
    int a = b++; //compiler error here
    int b = 0;
}

This is documented in JLS 8.3

In your case, the output of the variables, if not changed, would be:

a = 3
b = 0
c = 1
d = 2

talex · Answer 2 · 2015-04-29T15:21:10+0000

The result will be a=3, b=0, c=1, d=2

.

If all this variable, declared in the same class, will be initialized in the order of appearance in the code.

PS: b = 0

because it a++

gets the value and then increments the value of the variable.