Notice: This page requires JavaScript to function properly.
Please enable JavaScript in your browser settings or update your browser.Lære Index Out Of Bounds | Arrays
Java Basics
course content

Kursusindhold

Java Basics

Java Basics

1. Getting Started
Backend DevelopmentRole of Java in the Backend Java Advantages Memory Types In Java Java's SyntaxYour First ProgramComments
2. Basic Types and Operations
Primitive Data TypesChallenge: Primitive TypesMathematical Operations on charMathematical Operations in JavaIf-Else StatementSwitch-Case StatementNew Task StructureChallenge: Weekday Switch
3. Loops
Introduction to LoopsWhile-LoopDo-While LoopChallenge: Building a Server Retry MechanismFor-Loop Increment and DecrementInfinite LoopChallenge: Filtering Numbers in a Loop
4. Arrays
What is Array?Using Loops with ArraysIndex Out Of BoundsTwo-Dimentional ArrayIteration In Two-Dimensional ArrayFor-Each Loop
5. String
What Is String? Basic Methods In StringPractical Applications of String MethodsChallenge: Filter Failure MessagesNullPointerException StringBuilderString Pool, Method Equals() Summary

book
Index Out Of Bounds

What is an index out of bounds error?

An "Index Out of Bounds" (IOB) exception occurs in Java when you attempt to access or modify an element in an array using an index that falls outside the valid range of indices for that array.

When you try to access an element with an index less than 0 or greater than or equal to the array's length, the "Index Out of Bounds" exception is thrown. This exception serves as a way for the Java program to indicate that you are attempting an invalid operation on the array.

There is an example that will throw an Index Out of Bounds exception:

Main.java

Main.java

copy

              
123456789

            
package com.example;

public class Main {
    public static void main(String[] args) {
        int[] array = {1, 2, 3, 4, 5};
        // This line will cause an "Index out of bounds exception"
        int element = array[5];
    }
}

To address the "Index Out of Bounds" exception, you can follow these steps:

  • Ensure that the index you use to access the array falls within the valid range of indices;
  • Verify that the array is not empty before attempting to access any elements;
  • Review your program's logic to confirm the accuracy of index calculations;
  • Use conditional statements or loops to prevent accessing elements beyond the valid index range.

Here's an example that demonstrates how to handle the Index Out of Bounds exception:

Main.java

Main.java

copy

              
12345678910111213141516

            
package com.example;

public class Main {
    public static void main(String[] args) {
        int[] array = {1, 2, 3};

        int index = 3; // Invalid index

        if (index >= 0 && index < array.length) {
            int element = array[index];
            System.out.println("Element at index " + index + ": " + element);
        } else {
            System.out.println("Invalid index");
        }
    }
}

In this example, we validate whether the index falls within the valid range before attempting to access the array. If the index is valid, we retrieve the element at that position. Otherwise, we manage the exception by displaying an error message.

1. When the Index Out of Bounds exception occurs?

2. How to solve IOB?

question mark

When the Index Out of Bounds exception occurs?

Select the correct answer

question mark

How to solve IOB?

Select the correct answer

Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 4. Kapitel 3

Spørg AI

expand

Spørg AI

ChatGPT

Spørg om hvad som helst eller prøv et af de foreslåede spørgsmål for at starte vores chat

course content

Kursusindhold

Java Basics

Java Basics

1. Getting Started
Backend DevelopmentRole of Java in the Backend Java Advantages Memory Types In Java Java's SyntaxYour First ProgramComments
2. Basic Types and Operations
Primitive Data TypesChallenge: Primitive TypesMathematical Operations on charMathematical Operations in JavaIf-Else StatementSwitch-Case StatementNew Task StructureChallenge: Weekday Switch
3. Loops
Introduction to LoopsWhile-LoopDo-While LoopChallenge: Building a Server Retry MechanismFor-Loop Increment and DecrementInfinite LoopChallenge: Filtering Numbers in a Loop
4. Arrays
What is Array?Using Loops with ArraysIndex Out Of BoundsTwo-Dimentional ArrayIteration In Two-Dimensional ArrayFor-Each Loop
5. String
What Is String? Basic Methods In StringPractical Applications of String MethodsChallenge: Filter Failure MessagesNullPointerException StringBuilderString Pool, Method Equals() Summary

book
Index Out Of Bounds

What is an index out of bounds error?

An "Index Out of Bounds" (IOB) exception occurs in Java when you attempt to access or modify an element in an array using an index that falls outside the valid range of indices for that array.

When you try to access an element with an index less than 0 or greater than or equal to the array's length, the "Index Out of Bounds" exception is thrown. This exception serves as a way for the Java program to indicate that you are attempting an invalid operation on the array.

There is an example that will throw an Index Out of Bounds exception:

Main.java

Main.java

copy

              
123456789

            
package com.example;

public class Main {
    public static void main(String[] args) {
        int[] array = {1, 2, 3, 4, 5};
        // This line will cause an "Index out of bounds exception"
        int element = array[5];
    }
}

To address the "Index Out of Bounds" exception, you can follow these steps:

  • Ensure that the index you use to access the array falls within the valid range of indices;
  • Verify that the array is not empty before attempting to access any elements;
  • Review your program's logic to confirm the accuracy of index calculations;
  • Use conditional statements or loops to prevent accessing elements beyond the valid index range.

Here's an example that demonstrates how to handle the Index Out of Bounds exception:

Main.java

Main.java

copy

              
12345678910111213141516

            
package com.example;

public class Main {
    public static void main(String[] args) {
        int[] array = {1, 2, 3};

        int index = 3; // Invalid index

        if (index >= 0 && index < array.length) {
            int element = array[index];
            System.out.println("Element at index " + index + ": " + element);
        } else {
            System.out.println("Invalid index");
        }
    }
}

In this example, we validate whether the index falls within the valid range before attempting to access the array. If the index is valid, we retrieve the element at that position. Otherwise, we manage the exception by displaying an error message.

1. When the Index Out of Bounds exception occurs?

2. How to solve IOB?

question mark

When the Index Out of Bounds exception occurs?

Select the correct answer

question mark

How to solve IOB?

Select the correct answer

Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 4. Kapitel 3
some-alt