Why this piece of Java code produces this output ?

Asked Sep 07 '18 at 14:55

Active Sep 07 '18 at 14:58

Viewed 79 times

A Java class with the following main:

    public static void main(String[] args){

    final int n = 3;
    String[] array = new String[n];

    for (String string : array) {
        string = "OK";
    }

    for (String string : array) {
        System.out.println(string);
    }
}

produces the output "null, null, null,". Eclipse IDE suggests me that "The value of the local variable ref is not used". Why?

N.B.: I know that I have to iterate the array using this code:

for(int i=0; i<n ;i++)
    array[i] = "OK";

asked Sep 07 '18 at 14:55

jfabrizio

1

https://stackoverflow.com/questions/720200/why-doesnt-this-for-each-loop-work – Sotirios Delimanolis Sep 07 '18 at 14:59
1

https://stackoverflow.com/questions/30364706/using-a-foreach-loop-to-change-values-in-a-2d-array – Sotirios Delimanolis Sep 07 '18 at 14:59
2

And a couple hundred more. – Sotirios Delimanolis Sep 07 '18 at 14:59
Yes: It's a duplicate. – jfabrizio Sep 07 '18 at 15:09
1

It's equal to: for (int i = 0; i < n; i++) { String s = array[i]; s = "OK"; } – jfabrizio Sep 07 '18 at 15:10

Why this piece of Java code produces this output ?

0 Answers0