Why this problem print 5?

Question

public static void main(String[] args) {
int[]a={4,5,7};
inc(a);
System.out.print(a[0]);
}

static void inc(int[] i){
i[0]++;
}

“In Java, variables of primitive types (int, float, boolean, etc.) are passed by value and not by the address of the variable when we talk about methods. When you pass a variable of primitive type to a method, you can be sure that the value of the variable will not be changed by the method.”

If this is true, then why does the value of position 0 increase through a method?

Answer 1

Your statement regarding primitives is true but arrays are objects in Java so the array reference is passed by value. Hope that answers the question.

Answer 2

Avinesh In this case it is an array of int integers (primitive) and not Integer objects (object). I'm still confused...

Answer 3

Give it a read.
https://stackoverflow.com/questions/12757841/are-arrays-passed-by-value-or-passed-by-reference-in-java