java 16 interview questions and answers

within the file. A source code file may contain at most one public class or interface. If a public class or interface is defined A Java source code file takes the name of a public class or interface that is defined within a source code file, then the source code file must take the name … Read more

An abstract method is a method whose implementation is deferred to a subclass. In Core Java, an abstract method is a method that is declared without providing an implementation in the class where it is declared. It is meant to be overridden by subclasses that extend the class containing the abstract method. The abstract method … Read more

The wait(), notify(), and notifyAll() methods are used to provide an efficient way for threads to wait for a shared resource. When a thread executes an object’s wait() method, it enters the waiting state. It only enters the ready state after another thread invokes the object’s notify() or notifyAll() methods. In Java, the wait(), notify(), and notifyAll() methods are used for inter-thread communication and synchronization. … Read more

Commas are used to separate multiple statements within the initialization and iteration parts of a forstatement. In Core Java, commas are used in the initialization and iteration parts of a for statement to allow multiple expressions. The syntax of a for statement in Java is as follows: java for (initialization; condition; iteration) { // body of … Read more

Frame. In Core Java, the Frame and Applet containers can have a MenuBar. The MenuBar class is part of the AWT (Abstract Window Toolkit) library in Java, and it is used to create menus in GUI applications. The Frame class represents a top-level window with a title and border, and the Applet class represents an … Read more