Unraveling Java's Mystique: A Deep Dive Into ArrayStoreException
Java, an object-oriented, class-based language, stands as one of the most widely-used programming languages worldwide, due to its flexibility, functionality, and compatibility. However, even with a robust language like Java, developers may encounter a variety of exceptions while coding - one such exception that we will be discussing in today’s blog post is ArrayStoreException.
Deploying the ArrayStoreException
ArrayStoreException is a RuntimeException in Java which typically shows up when you attempt to store an incompatible element into an array.
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Object x[] = new String[3];
x[0] = new Integer(0); //This line will throw ArrayStoreException at runtime.
In the above example, we are attempting to store an Integer object into an array of String objects, which is not permissible – hence the ArrayStoreException arises.
Understanding the Root Cause
Let’s delve deeper into the root cause of ArrayStoreException. It occurs chiefly when you violate the fundamental rule of adding elements to an array, that is, when you try adding an element of one datatype into an array of a differing datatype. In simple terms, if the runtime type of the array doesn’t match with the object type you’re trying to insert, Java throws an ArrayStoreException.
Encounter ArrayStoreException in a Real World Scenario
Consider the following scenario.
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class Animal {}
class Dog extends Animal {}
public class Main {
public static void main(String[] args) {
Animal[] animals = new Dog[10];
animals[0] = new Animal(); //This will raise an ArrayStoreException at runtime.
animals[0] = new Dog(); //This will work fine.
}
}
Here, an ArrayStoreException happens because a Dog IS an Animal (due to inheritance), but an Animal IS NOT a Dog. The array was initialized to hold Dog objects, so attempting to add an Animal object will throw an exception.
How to Avoid the ArrayStoreException?
You may follow the simple rule - Only add objects into the array that are instances of the class used to create the array.
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Object x[] = new String[3];
x[0] = new String("ArrayStoreException"); //This will run successfully.
Exception Handling
Exception handling is an important part of application development. In the case of ArrayStoreException, we can handle it using try-catch blocks:
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try {
Object x[] = new String[3];
x[0] = new Integer(0); //This line will throw ArrayStoreException at runtime.
} catch (ArrayStoreException ex) {
ex.printStackTrace();
}
This way, instead of abruptly terminating, the application prints the exception stack trace, thereby allowing developers to investigate and correct the root problem.
Bidding Adieu
By now, you have a firm understanding of what an ArrayStoreException is, its causative factors, and how to handle this exception astutely. Remember, mastering Java exceptions plays an integral part in your journey as a proficient Java developer. So, make sure you have a thorough knowledge on exceptions to write efficient, error-less code.
If you have any questions, feel free to leave a comment below. Until next time, happy coding!