+ 2

How can I insert numbers in a certain position in arrays in Java?

Actually, I'm running a loop in which I want to insert the input taken in the array in the sequence of input. But I'm not able to understand how to perform that action... Here's the code: System.out.print("Input the range: "); int n1=sc.nextInt(),n2,x=0; for(int i=0;i<n1;i++) { n2=sc.nextInt(); int arr[x++]=arr[n2]; } The error is in the last line and it's a run time error java.lang.ArrayIndexOutOfBoundsException:18

23rd May 2019, 3:01 PM
Utkarsh
Utkarsh - avatar
5 Respuestas
+ 3
// full code is import java.util.Scanner; import java.util.Arrays; public class Example { public static void main(String[] args) { Scanner sc = new Scanner(System.in); //Scanner sc = new Scanner("5\n2\n4\n6\n8\n10"); // test System.out.print("Input the range: "); int n1 = sc.nextInt(), n2, x=0; int[] arr = new int[n1]; //declare array here for(int i=0; i<n1; i++) { n2 = sc.nextInt(); arr[x++] = n2; //orig: int arr[x++] = arr[n2]; } System.out.println( "\n"+Arrays.toString(arr) ); } } // +Denise has also done some optimizations
23rd May 2019, 10:45 PM
zemiak
+ 2
Hello Utkarsh, there are some points I noticed from the snippet, is that the whole code? cause I don't see where the array <arr> was declared. I don't get how you want the array will be, so let's assume we have this array: {1,2,3,4,5} And we input five values: 2 4 1 3 0 How the array looks after the loop complete?
23rd May 2019, 5:21 PM
Ipang
+ 2
You don't need x. You can just use i from your for loop. Scanner scan = new Scanner(System.in); int n = scan.nextInt(); int[] arr = new int[n]; Now you have an array with length = n which you can fill using a for loop: for(int i = 0; i < n; i++){ arr[i] = scan.nextInt(); }
23rd May 2019, 10:34 PM
Denise Roßberg
Denise Roßberg - avatar
+ 1
Sorry! I will make some corrections and hope you will help me. Thanks
23rd May 2019, 3:22 PM
Utkarsh
Utkarsh - avatar
+ 1
Can you upload your code in code playground, link it here and tell us the specific spot?
23rd May 2019, 3:26 PM
HonFu
HonFu - avatar