java.lang.ArrayIndexOutOfBoundsException: 9

Question about the task

One large array and two small ones

Java Syntax, Level 7, Lesson 4

Under discussion

What's my code wrong? java.lang.ArrayIndexOutOfBoundsException: 9 Thanks a lot !!!

1. Create an array of 20 numbers.
2. Populate it with values from the keyboard.
3. Create two arrays of 10 numbers each.
4. Copy the large array into the two small ones: half the numbers into the first small array, and the second half into the second small array.
5. Display the second small array, each value on a new line.

Requirements:

The program must create an array of 20 integers.
The program should read 20 numbers from the keyboard for the large array.
The program must create two small arrays of 10 numbers each.
The program must copy one half of the large array into the first small array, copy the second half into the second array, and then display that array on the screen.

package com.codegym.task.task07.task0705; import java.io.BufferedReader; import java.io.InputStreamReader; import java.util.Arrays; /* One large array and two small ones */ public class Solution { public static void main(String[] args) throws Exception { BufferedReader r =new BufferedReader( new InputStreamReader(System.in)); int [] List = new int[20]; for (int i=0; i<List.length; i++) { String a= r.readLine(); int b= Integer.parseInt(a); List[i]= b; } int[] list1= Arrays.copyOfRange(List,0,9); int[] list2= Arrays.copyOfRange(List,10,19); for (int i=0; i<10; i++) System.out.println(list2[i]); //write your code here } }

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Clarendon lee

Level 8 , Baltimore, United States

14 November 2019, 20:44

Great , according to your help.It is good work indeed. But verify saying: Task requirements are not met.!!! Why? Thanks for your help..

Joseph

Level 22 , United States

12 November 2019, 07:59

useful

It's because in copyOfRange the last two parameters are inclusive for "from" and exclusive for "to". The documentation says about them: from - the initial index of the range to be copied, inclusive to - the final index of the range to be copied, exclusive. (This index may lie outside the array.) So when you come down to print the second array out it throws the exception because from 10 to 19 is of length 9. To fix this just code like this:

int[] list1= Arrays.copyOfRange(List,0,10);
int[] list2= Arrays.copyOfRange(List,10,20);