latest interview questions on core java in java

The non-Unicode letter characters $ and _ may appear as the first character of an identifier. In Java, the first character of an identifier must be a letter, an underscore (_), or a dollar sign ($). The subsequent characters can be letters, digits, underscores, or dollar signs. However, it’s important to note that Java identifiers are case-sensitive. So, the … Read more

By associating Checkbox objects with a CheckboxGroup. The Checkbox class in Java is used to create checkboxes, not radio buttons. In Java, if you want to create a radio button, you would typically use the RadioButton class, which is part of the JavaFX library. Here’s a simple example of creating a radio button in JavaFX: java … Read more

A protected method may only be accessed by classes or interfaces of the same package or by subclasses of the class in which it is declared. In Java, if a method is declared as protected, it can be accessed in the following places: Within the same package: Any class within the same package as the class containing … Read more

Component. In Core Java, the immediate superclass of the Container class is the Component class. The class hierarchy is as follows: lua java.lang.Object | +– java.awt.Component | +– java.awt.Container So, Container extends Component, making Component the immediate superclass of Container.

The finally clause of the try-catch-finally statement is always executed unless the thread of execution terminates or an exception occurs within the execution of the finally clause. The finally clause of a try-catch-finally statement in Java is executed no matter what, whether an exception is thrown or not. It ensures that the code within the … Read more