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Question 2 of 109

What are the different types of exceptions in Java?

beginner
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  • Checked Exceptions: Must be handled at compile time (IOException, SQLException)
  • Unchecked Exceptions: Runtime exceptions (NullPointerException, ArrayIndexOutOfBoundsException)
  • Errors: Serious system problems (OutOfMemoryError, StackOverflowError)
// Checked exception - must handle
try {
    FileReader file = new FileReader("file.txt");
} catch (IOException e) {
    e.printStackTrace();
}

// Unchecked exception - optional handling
String str = null;
str.length(); // NullPointerException
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