In Java, when an exception is thrown in a try block and caught in a catch block, if the catch block also throws an exception, what happens to the original exception?
AThe original exception is lost and only the new exception propagates
BBoth exceptions are chained together automatically
CThe original exception is stored in the cause field if exception chaining is used
DThe JVM throws a CompoundException containing both
Correct Answer:
C. The original exception is stored in the cause field if exception chaining is used
EXPLANATION
When exception chaining is explicitly used with initCause() or constructor parameters, the original exception becomes the cause of the new exception. Without explicit chaining, the original exception is lost. Exception chaining is not automatic in Java.
What does the getSuppressed() method of Throwable class return in context of try-with-resources?
AThe primary exception thrown in try block
BArray of exceptions suppressed while closing resources
CThe exception thrown in finally block
DException from outermost try-catch block
Correct Answer:
B. Array of exceptions suppressed while closing resources
EXPLANATION
When try-with-resources encounters an exception while closing a resource, it's added to the suppressed exceptions list. If an exception was already thrown in try, the close exception is suppressed rather than replacing it. getSuppressed() returns array of these suppressed exceptions.
Consider a scenario where you have nested try-catch blocks. If both inner and outer catch blocks match the thrown exception type, which one executes?
ABoth execute in sequence
BOnly the inner catch block executes
COnly the outer catch block executes
DThe JVM decides based on exception priority
Correct Answer:
B. Only the inner catch block executes
EXPLANATION
The innermost matching catch block executes first. If it doesn't rethrow the exception, the outer catch block won't execute. The exception is considered handled after the first matching catch block.
Which of the following exceptions would NOT be caught by catching Exception class in Java?
AIOException
BNullPointerException
CError
DArithmeticException
Correct Answer:
C. Error
EXPLANATION
Error is not a subclass of Exception. Both Error and Exception extend Throwable. Errors like OutOfMemoryError, StackOverflowError cannot be caught by Exception handlers. They must be caught separately if needed.
In Java 8+, when using try-with-resources with multiple AutoCloseable resources, in what order are they closed?
AIn the order they were declared (first declared, first closed)
BIn reverse order of declaration (last declared, first closed)
CIn random order determined by JVM
DSimultaneously in parallel threads
Correct Answer:
B. In reverse order of declaration (last declared, first closed)
EXPLANATION
Try-with-resources closes resources in LIFO (Last In, First Out) order. If you declare Resource1, then Resource2, Resource2 closes first, then Resource1. This ensures dependencies are respected.
What will be the output of this code?
try {
try {
throw new Exception("Inner");
} catch(Exception e) {
throw new RuntimeException("Outer");
}
} catch(RuntimeException e) {
System.out.println("Caught: " + e.getMessage());
}
ACaught: Inner
BCaught: Outer
CCompilation error
DNo output
Correct Answer:
B. Caught: Outer
EXPLANATION
The inner try catches Exception and throws RuntimeException. The outer catch catches RuntimeException and prints 'Caught: Outer'.
What will be printed when this code executes?
String str = "Java";
try {
int x = Integer.parseInt(str);
} catch(NumberFormatException e) {
System.out.println("Invalid number");
} catch(Exception e) {
System.out.println("General exception");
}
AInvalid number
BGeneral exception
CCompilation error
DNo output
Correct Answer:
A. Invalid number
EXPLANATION
Integer.parseInt("Java") throws NumberFormatException, which is caught by the first catch block. More specific exceptions should be caught before general ones.
