java 13 interview questions and answers

Canvas. In Core Java, the Component subclass used for drawing and painting is java.awt.Canvas. The Canvas class provides an area in which you can draw graphics and perform custom painting. It allows you to override the paint method to specify what should be drawn within the canvas. Here’s a simple example: java import java.awt.Canvas; import … Read more

getLabel() and setLabel(). In Core Java, specifically in the context of GUI programming using Swing, the methods used to get and set the text label displayed by a Button object are: To get the text label: getText(): This method retrieves the current text displayed on the button. To set the text label: setText(String text): This method sets … Read more

All tasks must implement the run() method, whether they are a subclass of Thread or implement theRunnable interface. In Java, all threads must implement the run() method. The run() method is the entry point for the code that will be executed in a separate thread. It’s a part of the Runnable interface, and when you create a thread by implementing … Read more

An object is subject to garbage collection when it becomes unreachable to the program in which it is used. In Java, an object becomes eligible for garbage collection when there are no more references to it. The Java Virtual Machine (JVM) has a garbage collector that automatically identifies and removes objects that are no longer … Read more

An unreachable object may become reachable again. This can happen when the object’s finalize() method is invoked and the object performs an operation which causes it to become accessible to reachable objects. No, in Java, once an object becomes unreachable, it cannot become reachable again. An object becomes unreachable when there are no references to it from … Read more