reverse element of the array in java?

Question

I want to print the array in reverse order but I don't know why it's not working. I want to reverse them using the way I have mentioned below, in a single line, but my logic is not working.

void dynamicinputArraytwo() throws IOException  {

    int buffer;
    int i,jo,io;
    System.out.println("Enter size");
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    buffer = Integer.parseInt(br.readLine());
    float arrtwo[]=new float[buffer];

    for( i=0;i< arrtwo.length;i++){
        System.out.println ("Enter elements of array=");
        arrtwo[i] = Float.parseFloat(br.readLine());
    }

    for (int jx=0; jx < arrtwo.length; jx++){
        System.out.println("array before reverse "+arrtwo[jx] + " ");
    }

    float arrthree[];
    arrthree = new float[arrtwo.length];

    for(io=0,jo=arrtwo.length; jo>=0;io++,jo--){
        arrthree[io] = arrtwo[jo] ;
    }

    for(io=0; io < arrtwo.length; io++){
        arrtwo[io] = arrthree[io] ;
    }

    for (int jx=0; jx < arrtwo.length; jx++){
        System.out.println("array after reverse "+arrtwo[jx] + " ");
    }
}

Possible duplicate of [How do I reverse an int array in Java?](http://stackoverflow.com/questions/2137755/how-do-i-reverse-an-int-array-in-java) — Jaroslaw Pawlak, Apr 19 '17 at 13:17
Please be more specific about what's going wrong than "not working." — EJoshuaS - Stand with Ukraine, Apr 19 '17 at 13:17
No i want to reverse array using the for loop mentioned in the program..i.e for(io=0,jo=arrtwo.length; jo>=0;io++,jo--){ arrthree[io] = arrtwo[jo] ; } — Priya Seghal, Apr 19 '17 at 13:18
You should learn [how to debug your program](https://ericlippert.com/2014/03/05/how-to-debug-small-programs/). — Thomas Fritsch, Apr 19 '17 at 13:21
If you would please tell us precisely in what way your program is misbehaving, we would have a much greater chance of spotting in the code how the misbehaviour is coming about. — Ole V.V., Apr 19 '17 at 13:41
Did my suggestion fix the issue? If so, can you [accept the answer](http://stackoverflow.com/help/accepted-answer)? — EJoshuaS - Stand with Ukraine, Apr 20 '17 at 16:44

EJoshuaS - Stand with Ukraine · Answer 1 · 2017-04-19T14:47:05.893

1

Your first problem is here:

for(io=0,jo=arrtwo.length; jo>=0;io++,jo--){
    arrthree[io] = arrtwo[jo] ;
}

The last index of an array is length - 1 because arrays are indexed starting at 0, so you'll have an exception (i.e. arrtwo[arrtwo.length] is not a valid index in the array). You should set jo to arrtwo.length - 1 initially instead.

edited Apr 19 '17 at 14:47

answered Apr 19 '17 at 13:21

EJoshuaS - Stand with Ukraine

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reverse element of the array in java?

1 Answers1