Top 75 Java Interview Questions - What’s the Difference Between Error and Exception in Java?
💡 Java Tricky Interview Question 15
Is there a difference between an `Error` and an `Exception` in Java? 🤔 Absolutely—and it’s critical to understand, especially for exception handling, debugging, and writing reliable code. In this video, we’ll break down the key distinctions, common misconceptions, and realworld examples to help you master this topic.
🔥 What You’ll Learn in This Video:
✅ The core difference between `Error` and `Exception`
✅ When to expect an `Error` vs an `Exception`
✅ Why you typically don’t catch `Errors`
✅ Checked vs Unchecked exceptions
✅ Realworld examples of each and how to handle them
📌 Quick Answer:
📍 `Throwable` is the superclass of both `Error` and `Exception`.
✔️ `Exception`: Represents recoverable conditions in the application (e.g., invalid input, file not found).
🚫 `Error`: Represents serious problems that a program should not try to catch or handle (e.g., `OutOfMemoryError`, `StackOverflowError`).
🔍 Deeper Explanation:
✅ `Exception`:
🔹 Represents conditions your program should anticipate and handle.
🔹 Divided into:
Checked exceptions (e.g., `IOException`, `SQLException`) → Must be handled with `trycatch` or declared with `throws`.
Unchecked exceptions (e.g., `NullPointerException`, `ArrayIndexOutOfBoundsException`) → Occur at runtime and don’t need to be declared.
🔹 Typically used for business logic or expected failure cases.
🚫 `Error`:
🔹 Represents serious issues with the JVM or system.
🔹 Examples:
`OutOfMemoryError`
`StackOverflowError`
`NoClassDefFoundError`
🔹 You should not try to catch an `Error`—it indicates something is wrong at a low level, and recovery is usually not possible.
⚠️ Important Notes:
⚠️ Catching `Error` is legal but strongly discouraged—you likely can’t fix it at runtime.
⚠️ Only catch exceptions you can recover from—don’t use `catch(Exception e)` blindly.
⚠️ Use custom exceptions for meaningful, applicationspecific errors.
📢 Want More Java Interview Questions?
Subscribe for 75+ tricky Java interview questions to help you ace your next technical interview!
🔔 Turn on notifications so you don’t miss a single question!
JavaInterview JavaTrickyQuestions ErrorVsException JavaExceptions JavaProgramming