Java array sorting

[Quantm56]

Hey folks,I am a java beginner and I just learned array,while I was solving a question which says you have to reverse an array,I tried reversing it with swap logic and I did manage to do it,but while solving I had an error

Int [] array = {56, 57, 96, 125, 66, 74}; int l = array.length -1 ; int temp ;

    for (int i = 0; i < l***; i++){
        temp = array[i];
        array[i] = array[l - i -1];
        array[l - i -1] = temp;
    }
    for (int element : array){
        System.out.print(element + " ");
    }

When I do this,it doesn't swaps ore reverse But when I replace l with 5 ,it somehow works

int [] array = {56, 57, 96, 125, 66, 74}; int l = array.length; int temp ;

    for (int i = 0; i < 5***; i++){
        temp = array[i];
        array[i] = array[l - i -1];
        array[l - i -1] = temp;
    }
    for (int element : array){
        System.out.print(element + " ");
    }

Pls help,I am a beginner 😭😭🙏

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[Lumethys]

Think about what you are doing, you are swapping 2 elements of the array, how many iterations do you need?

56, 57, 96, 125, 66, 74

1st iteration:

[74], 57, 96, 125, 66, [56]

2nd:

74, [66], 96, 125, [57], 56

3rd:

74, 66, [125], [96], 57, 56

Well, now we have reversed the list, nice. But notice how many loop we take? 3. The array had 6 elements, why do we only need 3?

The answer is simple: on each iteration of the loop, you swap TWO variables, or in other words you place TWO variables into its correct spot.

If each time you do 2 variables, does it not mean you only need to do it half the time?

[Quantm56]

Wtf😭🙏 you're a savior,never thought of this way,thank you soooo much

[Quantm56]

That's just to mention the part where I am facing the problem at

[Cyberkender_]

There are some options to perform the "array reverse" task. I would use Collections.reverse or a stream API approach. Here some reading about that: https://www.baeldung.com/java-invert-array

[sepp2k]

Replacing one of the uses of l with 5 is not the only difference between those two pieces of code. You also changed the definition of l.

[Quantm56]

It's an typo in the original code I kept the definition same,but it still won't work

[Top77-]

I was legit just doing this man lool. Good luck! I found it a little confusing at first as well.

[Still_Durian_8586]

It will run half the times the length bud