java - How to handle array:Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 3

Question

In my code i am comparing the 2 elements of an array. but i got the following exception.please can anybody help me

array:Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 3 at Sarray.main(Sarray.java:64)

public class Sarray    
{    
        public static void main(String[] args)  
       {     



     Scanner scan = new Scanner(System.in); 
     System.out.print( "Enter sorted array length:" );
     int length = scan.nextInt();

     int[] a = new int[length];
     System.out.println("Enter integer sorted array:");      

     for(int i = 0;i<length;i++) 
     {
         String token = scan.next();
         a[i] = Integer.parseInt(token);         
     }       
     System.out.print("Unique array:");
     int[] b=new int[length];        
     int k=0;
     for(int i=0;i<length;i++)
     {  
        //here i got Exception              
         if(a[i] != a[i+1])
         {
             b[k++]= a[i];
         }
     }               
     for(int i=0;i<k;i++)
     {
         System.out.print(b[i]+" "); 
     }   
 }
}

Prince John Wesley · Accepted Answer · 2011-11-02 07:18:19Z

3

 for(int i=0;i<length;i++)

should be

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

since you can have length - 1 number of comparisons.

answered Nov 2, 2011 at 7:18

Prince John Wesley

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Comments

AlexR · Accepted Answer · 2011-11-02 07:18:45Z

2

When i == length -1 your i + 1 == length that is illegal. See a[i+1]

answered Nov 2, 2011 at 7:18

AlexR

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Comments

Dave Newton · Accepted Answer · 2011-11-02 07:18:48Z

1

Your "i + 1" will go past the array bounds when you reach the last element.

answered Nov 2, 2011 at 7:18

Dave Newton

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Comments

Bhargav Desai · Accepted Answer · 2021-01-23 18:31:33Z

-1

error arrives because value of i+1 is more than the array length.

instead of

for (int i=0; i<length; i++)

use

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

edited Jan 23, 2021 at 18:31

Bhargav Desai

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answered Jan 23, 2021 at 7:50

Shreevatsa MS

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