Sim Infosystems Interview Questions and Answers

Deadlock is a situation where two or more processes are unable to proceed because they are waiting for each other to release resources.

• Deadlock occurs when two or more processes are blocked and unable to proceed.

• It happens when each process is holding a resource and waiting for another resource to be released.

• There are four necessary conditions for deadlock: mutual exclusion, hold and wait, no preemption, and circular wait.

• Examples of resources that can cause deadlock include...read more

Checked and Unchecked Exceptions are types of exceptions in Java. Checked exceptions are checked at compile-time while unchecked exceptions are not.

• Checked exceptions are those which are checked at compile-time and must be handled by the programmer using try-catch or throws keyword.

• Examples of checked exceptions include IOException, SQLException, ClassNotFoundException.

• Unchecked exceptions are those which are not checked at compile-time and can occur at runtime.

• Examples of un...read more

Yes, we can use super and this in a single constructor.

• Using 'super' in a constructor calls the parent class constructor.

• Using 'this' in a constructor calls another constructor in the same class.

• We can use both 'super' and 'this' in the same constructor to call both parent and same class constructors.

• Example: public MyClass(int x) { this(x, 0); super(); }

Yes, protected members are inherited in subclasses in hierarchy.

• Protected members are accessible within the class and its subclasses.

• They are not accessible outside the class hierarchy.

• Subclasses can access protected members of their parent class.

• Example: class A has a protected member x, class B extends A can access x.

• Example: class C extends B can also access x.

The super class of Exception is Throwable.

• Throwable is the root class of all exceptions in Java.

• It has two direct subclasses: Exception and Error.

• Exceptions are used for recoverable errors while Errors are used for unrecoverable errors.

• All exceptions and errors inherit from Throwable.

• Throwable provides methods like getMessage() and printStackTrace() to handle exceptions.

Data structures are essential for efficient storage and retrieval of data.

• Data structures allow for faster access and manipulation of data.

• They help in organizing and managing large amounts of data.

• Examples include arrays, linked lists, trees, and graphs.

• Without data structures, algorithms would be less efficient and more complex.

• Data structures are used in various fields such as computer science, finance, and engineering.

A programme to check if a given string is a palindrome.

• Create a function that takes a string as input.

• Convert the string to lowercase and remove any non-alphanumeric characters.

• Reverse the string and compare it to the original string.

• If they are the same, return true. Otherwise, return false.