java 13 interview questions and answers

An event-listener interface defines the methods that must be implemented by an event handler for a particular kind of event. An event adapter provides a default implementation of an event-listener interface. In Java, event-listener interfaces and event-adapter classes are related to handling events in graphical user interface (GUI) programming. Here’s the explanation: Event-Listener Interface: An … Read more

The String literal “abc” is not a primitive value. It is a String object. No, “abc” is not a primitive value in the context of Core Java. In Java, primitive data types include int, float, double, char, boolean, byte, short, and long. These types represent simple values, and they are not objects. On the other hand, “abc” is a … Read more

When a window is repainted by the AWT painting thread, it sets the clipping regions to the area of the window that requires repainting. In the context of Core Java and graphical user interfaces (GUIs), clipping and repainting are related concepts that involve rendering and updating graphical elements on the screen. Clipping: Clipping refers to … Read more

The Class class is used to obtain information about an object’s design. To obtain design information about an object in Core Java, you would typically use the Class class. The Class class is part of the Java Reflection API and provides methods to get information about the class, such as its name, superclass, implemented interfaces, constructors, methods, … Read more

The eight primitive types are byte, char, short, int, long, float, double, and boolean. In Java, there are eight primitive data types, and they can be categorized into two groups: numeric and non-numeric. Numeric Data Types: byte: 8-bit signed integer short: 16-bit signed integer int: 32-bit signed integer long: 64-bit signed integer float: 32-bit floating-point number double: 64-bit floating-point number Non-Numeric Data Types: … Read more