Arrayindexoutofbounds Exception Example in Java

Introduction

ArrayIndexOutOfBounds Exception is a classic Java console program that demonstrates the concept with complete source code and sample output. Exceptions represent runtime errors; Java uses try-catch-finally to handle them safely.

This tutorial walks through the program line by line, explains how the logic works, and highlights best practices you can apply in your own code.

Syntax

try{
	//Statements
}catch(Expression_type Variable_name){
	//Statements
}

ArrayIndexOutOfBounds Exception Example Program

public class ArrayIndexOutOfBoundsException {
    static  void printArrayValue(){
        try{
        String[] array = new String[]{"one","two","three","four","five"};
        //Trying to get value at index 10. But the length of array is 5
        //Hence exception is thrown
        String value = array[10];
        }catch(Exception e){
            System.err.println("Exception is : "+e.toString());
        }
    }
    
    public static void main(String[] args) {
        printArrayValue();
    }
}

Sample Output

Exception is : java.lang.ArrayIndexOutOfBoundsException: 10

When to use

Use this arrayindexoutofbounds exception example when learning or revising core Java syntax.

How it works

1. Execution begins in the main method — the JVM calls this method when you run the class.

2. String[] array = new String[]{"one","two","three","four","five"}; updates a variable used in the calculation or output.

3. String value = array[10]; updates a variable used in the calculation or output.

4. Compare your console output with the sample output for ArrayIndexOutOfBounds Exception to confirm the program behaves correctly.

Best Practices

• Use meaningful variable and class names that describe their purpose.
• Compile and run the program locally — modify values to see how output changes.
• Read compiler errors carefully; they usually point to the exact line to fix.

Common Mistakes

• Copying code without understanding each line — practice by changing one statement at a time.
• Mismatching the public class name and the .java filename.
• Forgetting semicolons at the end of statements.