java 16 interview questions and answers

The elements of a BorderLayout are organized at the borders (North, South, East, and West) and the center of a container. In Core Java, the elements of a BorderLayout are organized into five regions: North: Positioned at the top. South: Positioned at the bottom. East: Positioned on the right. West: Positioned on the left. Center: Positioned at … Read more

The Dictionary class provides the capability to store key-value pairs. In Core Java, as of my last knowledge update in January 2022, there is no built-in Dictionary class in the standard Java API. However, there is a similar class called Hashtable that can be used for key-value pairs. If you are referring to a custom class or … Read more

An object’s lock is a mechanism that is used by multiple threads to obtain synchronized access to the object. A thread may execute a synchronized method of an object only after it has acquired the object’s lock. All objects and classes have locks. A class’s lock is acquired on the class’s Class object. In Java, every object … Read more

A private variable may only be accessed within the class in which it is declared. In Java, if a variable is declared as private, it can only be accessed within the same class. Private access modifier restricts access to the members (variables or methods) to the class in which they are declared. This means that … Read more

String objects are constants. StringBuffer objects are not constants. In Core Java, the main difference between the String and StringBuffer classes lies in their mutability. Immutability (String): Strings in Java are immutable, meaning their values cannot be changed once they are assigned. Any operation that appears to modify a String actually creates a new String object. Example: java … Read more