java 13 interview questions and answers

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

getState().getState() In Core Java, to determine if a Checkbox is checked, you can use the isSelected() method. The isSelected() method returns a boolean value that indicates whether the Checkbox is currently in the checked state or not. Here’s an example: java import java.awt.*; import java.awt.event.*;public class CheckboxExample { public static void main(String[] args) { Frame … Read more

So they can be invoked as if they are a mathematical code library. The methods of the Math class in Java are declared as static because the Math class is designed to provide utility functions for mathematical operations, and there is no need to create an instance of the Math class to use these methods. … Read more