I want to sort array elements in ascending order.i cannot understand the error"exception in thread main java.lang.arrayindexoutofboundexception:12 at sort_array.main(sort_array.java:20)

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I want to sort array elements in ascending order.Following is my java code, i cannot understand the error"Exception in thread main java.lang.ArrayIndexOutOfBoundsException: 12 at Sort_array.main(Sort_array.java:20)"

What I have tried:

import java.math.*;
class Sort_array
{
public static void main(String args[])
{
int arr[] = new int[12];
int i=0,j = 0,temp;
System.out.print("The actual array is ");
for(i=0;i<10;i++)
{
arr[i] = (int)(Math.random()*100);
System.out.print(arr[i]+" ");
}
System.out.println();
System.out.print("Sorted array is ");
for(i=0;i<=arr.length;i++)
{
for(j=i+1;j<=arr.length;j++)
{
if(arr[i]>arr[j])
{
temp=arr[i];
arr[i]=arr[j];
arr[j]=temp;
}
}
}

for(i=0;i<10;i++)
System.out.print(arr[i]+" ");
}
}

Posted 12-Aug-17 9:45am

Member 13358597

Updated 12-Aug-17 14:44pm

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Michael_Davies · Answer 1 · 2017-08-12T10:54:00

Solution 1

Array is zero based so an array of dimensions 12 is indexed from 0 to 11, your for loop condition tests against the array length which is 12 elements so loops 0 to 12, you need it to be array length -1.

for(i=0;i<= arr.length - 1;i++)

Posted 12-Aug-17 10:54am

Michael_Davies

Patrice T · Answer 2 · 2017-08-12T14:44:00

Java is zero based, which that an array of length 12 have elements from 0 to 11.
The right code is

Java

for(i=0;i<arr.length;i++)

Another problem is that arr have 12 elements, but you fill only 10 of them.

There is a tool that allow you to see what your code is doing, its name is debugger. It is also a great learning tool because it show you reality and you can see which expectation match reality.
When you don't understand what your code is doing or why it does what it does, the answer is debugger.
Use the debugger to see what your code is doing. Just set a breakpoint and see your code performing, the debugger allow you to execute lines 1 by 1 and to inspect variables as it execute.

Debugger - Wikipedia, the free encyclopedia[^]
http://docs.oracle.com/javase/7/docs/technotes/tools/windows/jdb.html[^]
https://www.jetbrains.com/idea/help/debugging-your-first-java-application.html[^]
The debugger is here to show you what your code is doing and your task is to compare with what it should do.
There is no magic in the debugger, it don't find bugs, it just help you to. When the code don't do what is expected, you are close to a bug.