java 13 interview questions and answers

The prefix form performs the increment operation and returns the value of the increment operation. The postfix form returns the current value all of the expression and then performs the increment operation on that value. In Java, the ++ operator can be used in both prefix and postfix forms, and they have different behaviors. Prefix … Read more

Try statements may be tested. In Java, the try statement can be nested. This means that you can have one or more try blocks inside another try block. This allows for more granular exception handling, where specific portions of code can have their own exception-handling logic. Here’s an example of nested try blocks: java public class … Read more

The default value of the boolean type is false. In Java, local variables (including boolean variables) are not automatically initialized. If you declare a boolean variable within a method or block without initializing it, the compiler will generate an error if you try to use the variable before giving it a value. For example: java public class Example … Read more

A public class may be accessed outside of its package. A non-public class may not be accessed outside of its package. In Java, the access modifiers public, protected, package-private (default), and private are used to control the visibility and accessibility of classes, methods, and fields. When it comes to classes specifically, there are two main … Read more

A Scrollbar is a Component, but not a Container. A ScrollPane is a Container. A ScrollPane handles its own events and performs its own scrolling. In Java, particularly in graphical user interface (GUI) development using Swing, a Scrollbar and a ScrollPane are related components but serve different purposes. Scrollbar: A Scrollbar is a user interface element that allows users to scroll … Read more