Array index out of out-of-bounds exception
Encountering the dreaded ArrayIndexOutOfBoundsException
? This guide explains its cause and provides a practical solution. Even if you haven't experienced this error yet, understanding it will save you debugging headaches down the line.
The ArrayIndexOutOfBoundsException
arises when your code attempts to access an array element using an index that's outside the array's valid range. In Java (and many other languages), array indices begin at 0 and extend to array.length - 1
. Trying to access array.length
or a negative index will trigger this exception.
Case Study: A Java Sorting Program
Consider a Java program designed to read integers from a file, sort them using bubble sort, and display the sorted results. The original code, shown below, produced an ArrayIndexOutOfBoundsException
.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 |
|
The Root of the Problem
The primary issue lies in the nested loop within the bubble sort. The line if(nums[i] > nums[j 1])
is problematic. When j
reaches nums.length - 1
, j 1
becomes nums.length
, an invalid index.
The Solution: Adjusting Loop Boundaries
The fix involves modifying the inner loop's condition to prevent j
from reaching the last index when j 1
is used. Instead of:
1 |
|
Use:
1 |
|
This subtle change ensures that the code avoids accessing nums[j 1]
when j
is at its maximum valid value (nums.length - 2
).
Further Considerations
-
Array Size: The initial array declaration
int [] nums = new int [(int) name.length()];
is also potentially problematic. The file name's length is unrelated to the number of integers in the file. It's better to dynamically size the array based on the actual number of integers read from the file, or to use a more flexible data structure likeArrayList
. -
Error Handling: Robust code includes error handling (e.g.,
try-catch
blocks) to manage potential exceptions likeFileNotFoundException
orNumberFormatException
during file input.
By understanding the cause and applying the provided solution, you can effectively prevent and resolve ArrayIndexOutOfBoundsException
errors in your programs. Remember to carefully consider array sizing and incorporate comprehensive error handling for robust and reliable code.
The above is the detailed content of Array index out of out-of-bounds exception. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics











Troubleshooting and solutions to the company's security software that causes some applications to not function properly. Many companies will deploy security software in order to ensure internal network security. ...

Solutions to convert names to numbers to implement sorting In many application scenarios, users may need to sort in groups, especially in one...

Field mapping processing in system docking often encounters a difficult problem when performing system docking: how to effectively map the interface fields of system A...

When using MyBatis-Plus or other ORM frameworks for database operations, it is often necessary to construct query conditions based on the attribute name of the entity class. If you manually every time...

Start Spring using IntelliJIDEAUltimate version...

Conversion of Java Objects and Arrays: In-depth discussion of the risks and correct methods of cast type conversion Many Java beginners will encounter the conversion of an object into an array...

Detailed explanation of the design of SKU and SPU tables on e-commerce platforms This article will discuss the database design issues of SKU and SPU in e-commerce platforms, especially how to deal with user-defined sales...

How does the Redis caching solution realize the requirements of product ranking list? During the development process, we often need to deal with the requirements of rankings, such as displaying a...
