java 13 interview questions and answers

There are two types of casting, casting between primitive numeric types and casting between object references. Casting between numeric types is used to convert larger values, such as double values, to smaller values, such as byte values. Casting between object references is used to refer to an object by a compatible class, interface, or arraytype reference. In Java, casting refers to … Read more

When a task’s interrupt() method is executed, the task enters the ready state. The next time the task enters the running state, an InterruptedException is thrown. When you invoke a thread’s interrupt method while it is sleeping or waiting, it will cause the thread to receive an InterruptedException. This interruption can be used to gracefully stop the thread or … Read more

Two methods may not have the same name and argument list but different return types. In Core Java, there are certain restrictions placed on method overloading. These restrictions help maintain clarity and consistency in the language. The key restrictions on method overloading in Java are: Parameter Types and Number: Overloaded methods must have a different … Read more

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