Asked by: Jorgelina Meredith
technology and computing programming languages

How do you avoid array index out of bound exception?

Last Updated: 25th May, 2020

34
In order to prevent "array index out of bound" exception, the best practice is to keep the starting index in such a way that when your last iteration is executed, it will check the element at index i & i-1, instead of checking i & i+1 (see line 4 below).

Click to see full answer.

Also know, what is array index out of bound exception?

The array index out of bounds error is a special case of the buffer overflow error. It occurs when the index used to address array items exceeds the allowed value. It's the area outside the array bounds which is being addressed, that's why this situation is considered a case of undefined behavior.

One may also ask, what causes ArrayIndexOutOfBoundsException? An ArrayIndexOutOfBoundsException is caused by trying to retrive a "box" that does not exist, by passing an index that is higher than the index of last "box", or negative.

  • name.
  • When accessing the contents of an array, position starts from 0.
  • When you loop, since i can be less than or equal to name.

Correspondingly, how do you handle an array out of bound exception in Java?

The index of an array is an integer value that has value in interval [0, n-1], where n is the size of the array. If a request for a negative or an index greater than or equal to size of array is made, then the JAVA throws a ArrayIndexOutOfBounds Exception. This is unlike C/C++ where no index of bound check is done.

What is String index out of bound exception in Java?

lang. StringIndexOutOfBoundsException if beginIndex is negative, or larger than the length of the string. This method returns a sub-string that begins with the character at the specified index and extends until the character at endIndex-1 index. It throws an java.

Related Question Answers

Sheng Guelalsoro

Professional

What is a NullPointerException and how do I fix it?

These include:
  1. Calling the instance method of a null object.
  2. Accessing or modifying the field of a null object.
  3. Taking the length of null as if it were an array.
  4. Accessing or modifying the slots of null as if it were an array.
  5. Throwing null as if it were a Throwable value.

Tanta Kuttikkad

Professional

What is array indexing?

Array indexing refers to any use of the square brackets ([]) to index array values.

Moises Erezuma

Professional

Does C perform array out of bound checking?

C does not check array bounds. In fact, a segmentation fault isn't specifically a runtime error generated by exceeding the array bounds. Rather, it is a result of memory protection that is provided by the operating system.

Aouicha Palombi

Explainer

What happens if array goes out of bounds?

If we use an array index that is out of bounds, then the compiler will probably compile and even run. But, there is no guarantee to get the correct result. Result may unpredictable and it will start causing many problems that will be hard to find. Therefore, you must be careful while using array indexing.

Ibrahime Breijo

Explainer

What is a null pointer exception?

NullPointerException is a RuntimeException . In Java, a special null value can be assigned to an object reference. NullPointerException is thrown when an application attempts to use an object reference that has the null value. These include: Calling an instance method on the object referred by a null reference.

Maryem Meurer

Explainer

What is array bound checking?

In computer programming, bounds checking is any method of detecting whether a variable is within some bounds before it is used. It is usually used to ensure that a number fits into a given type (range checking), or that a variable being used as an array index is within the bounds of the array (index checking).

Aurea Larralde

Pundit

What is parallel array in C?

A parallel array is a structure that contains multiple arrays. Each of these arrays are of the same size and the array elements are related to each other. All the elements in a parallel array represent a common entity.

Arina CarriƧo

Pundit

What is Java Lang IndexOutOfBoundsException?

The IndexOutOfBoundsException is thrown when attempting to access an invalid index within a collection, such as an array , vector , string , and so forth. It can also be implemented within custom classes to indicate invalid access was attempted for a collection.

Nazmul Awroroff

Pundit

How do you handle Java Lang ArrayIndexOutOfBoundsException?

Here are few handy tips to avoid ArrayIndexOutOfBoundsException in Java:
  1. Always remember that array is zero based index, first element is at 0th index and last element is at length - 1 index.
  2. Pay special attention to start and end condition of loop.
  3. Beware of one-off errors like above.

Adria Taroncher

Pundit

How are exceptions handled in Java?

Customized Exception Handling : Java exception handling is managed via five keywords: try, catch, throw, throws, and finally. If an exception occurs within the try block, it is thrown. Your code can catch this exception (using catch block) and handle it in some rational manner.

Gioacchino Makurov

Pundit

How do you throw an exception in Java?

You can throw an exception in Java by using the throw keyword. This action will cause an exception to be raised and will require the calling method to catch the exception or throw the exception to the next level in the call stack.

Dilson Elexaga

Teacher

What are the different ways of copying an array into another array?

There are multiple ways to copy elements from one array in Java e.g. you can manually copy elements by using a loop, create a clone of the array, use Arrays. copyOf() method or System. arrayCopy() to start copying elements from one array to another in Java.

Rani Gadepalli

Teacher

How do you handle null pointer exception in Java?

These can be:
  1. Invoking a method from a null object.
  2. Accessing or modifying a null object's field.
  3. Taking the length of null, as if it were an array.
  4. Accessing or modifying the slots of null object, as if it were an array.
  5. Throwing null, as if it were a Throwable value.
  6. When you try to synchronize over a null object.

Malia Mugakide

Teacher

What does array length return?

Array Length. length is a property of arrays in JavaScript that returns or sets the number of elements in a given array. The length property of an array can be returned like so. The assignment operator, in conjunction with the length property, can be used to set then number of elements in an array like so.

Reginaldo

Teacher

What is an arithmetic exception in Java?

ArithmeticException : Thrown when an exceptional arithmetic condition has occurred. For example, an integer "divide by zero" throws an instance of this class. Moreover, most exceptions are constructed with a message to help you even further figure out what happened.

Carleen Hofe

Reviewer

How do you instantiate an array?

To instantiate an array, use this syntax: arrayName = new datatype[ size ]; where size is an expression that evaluates to an integer and specifies the number of elements. When an array is instantiated, the elements are assigned default values according to the array data type.

Saidi El Amraoui

Reviewer

How do you declare an array in Java?

To create an array in Java, you use three steps:
  1. Declare a variable to hold the array.
  2. Create a new array object and assign it to the array variable.
  3. Store things in that array.

Adinath Lacarcel

Reviewer

Why do we get array index out of bound exception?

If we request for an index that is either negative, or greater than or equal to the size of the array, an ArrayIndexOutOfBoundsException is thrown. The ArrayIndexOutOfBoundsException is a RuntimeException thrown only at runtime. The Java Compiler does not check for this error during the compilation of a program.

Bita Olloqui

Reviewer

What is thread main exception?

The Exception in thread "main" java. lang. NoClassDefFoundError is a common error in Java which occurs if a ClassLoader is not able to find a particular class in the classpath while trying to load it. This error can occur to any thread but if it happens in main thread then your program will crash.