Technical Interview Questions
The Set interface provides methods for accessing the elements of a finite mathematical set. Sets do not allow duplicate elements. The Set interface in Java is a part of the Java Collections Framework and is part of the java.util package. It extends the Collection interface and represents a collection of unique elements. Unlike a List, a Set … Read more
Once an object is garbage collected, it ceases to exist. It can no longer become reachable again. No, once an object has been garbage collected in Java, it cannot become reachable again. Garbage collection is the process by which the Java Virtual Machine (JVM) automatically identifies and removes objects that are no longer reachable or … Read more
An I/O filter is an object that reads from one stream and writes to another, usually altering the data in some way as it is passed from one stream to another. In the context of Core Java, an I/O filter typically refers to an object that is used to perform filtering on data as it … Read more
The left operand is an object reference or null value and the right operand is a class, interface, or arraytype. In Java, the instanceof operator is used to test whether an object is an instance of a particular class or interface. The legal operands for the instanceof operator are: Object Reference: The left operand of the instanceof operator … Read more
An executing thread is in the running state. When a thread in Java is executing, it is in the “Runnable” state. In the multithreading context of Java, a thread goes through different states in its lifecycle. The main states are: New: The thread is in this state before the start() method is called on it. … Read more