core java in java questions asked in companies

A thread class may be declared as a subclass of Thread, or it may implement the Runnable interface. In Java, there are two basic ways to define classes that can be run as threads: Extending the Thread class: You can create a new class that extends the Thread class and override its run() method. The run() method contains … Read more

Synchronized methods are methods that are used to control access to an object. A thread only executes a synchronized method after it has acquired the lock for the method’s object or class. Synchronized statements are similar to synchronized methods. A synchronized statement can only be executed after a thread has acquired the lock for the … Read more

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