How can I replace static value in array

Question

How can I replace static value in an array? i want user's first input to be placed at first index.

Scanner input = new Scanner(System.in);

int[] arr = {0,0,0,0,0};

int seat = input.nextInt();

if(seat >=1 || seat <=5)

{

//how can i assign first input to index 0 permanently?

}

Permanently? You can't. All you can do is assign it, and then try not to assign it again. arr[0] = seat;. — Andy Turner
– Andy Turner, Commented Jul 26, 2019 at 13:19
Oh okay thanks. Can i ask one more thing? What loop(s) should best suit in a seat reservation program? — 2se4n
– 2se4n, Commented Jul 26, 2019 at 13:24
There is no way to answer that without more detail (and the amount of detail you'd need to provide is more than you can provide in a comment). — Andy Turner
– Andy Turner, Commented Jul 26, 2019 at 13:26
I think you meant && in your logical if. The way you have it written will always result in a true statement. Any number which is false with the first condition will be true with the second, and vise versa. — WJS
– WJS, Commented Jul 26, 2019 at 14:30

Pasukaru · Accepted Answer · 2019-07-26 13:24:56Z

1

Arrays are mutable by definition. You can always assign a new value to any index arr[index] = newValue. You cannot make arrays read-only.

There are, however, read only lists that don't allow them to be altered after initialization, see for example java.util.Collections.unmodifiableList(<list>).

I don't know of any default implementation to lock a specific index of a List. For this you probably need your own implementation of the List interface.

answered Jul 26, 2019 at 13:24

Pasukaru

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mperic · Accepted Answer · 2019-07-26 13:24:28Z

0

The elements of an array can not be made unchangeable or final.You could try checking for the value of array[0] every time the array is accessed and ensure that array[0] equals what you want it to by assigning it to a final variable (constant) each time your array operations are complete.

answered Jul 26, 2019 at 13:24

mperic

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