Author: saqibkhan

  • Define Wrapper Classes in Java.

    In Java, when you declare primitive datatypes, then Wrapper classes are responsible for converting them into objects(Reference types). 

  • What is an object-oriented paradigm?

    A Paradigm that is based on the concepts of “Objects.” It contains data and code. Data that is in the form of fields, and regulation, that is in the form of procedures. The exciting feature of this paradigm is that the object’s procedures can access and often modify the data fields themselves.

  • What is Object Cloning?

    An ability to recreate an object entirely similar to an existing object is known as Object Cloning in Java. Java provides a clone() method to clone a current object offering the same functionality as the original object.

  • What is a Marker Interface?

    An empty interface in Java is referred to as a Marker interface. Serializable and Cloneable are some famous examples of Marker Interface. 

  • Define Copy Constructor in Java

    A Copy Constructor in Java is a constructor that initializes an object through another object of the same class.

  • What do you mean by aggregation?

    The term aggregation refers to the relationship between two classes best described as a “whole/part” and “has-a” relationship. This kind is the most specialized version of an association relationship. It contains the reference to another class and is said to have ownership of that class.

  • What is an Association?

    An Association can be defined as a relationship that has no ownership over another. For example, a person can be associated with multiple banks, and a bank can be related to various people, but no one can own the other.

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  • Explain the expected output of the following code segment?

    public class Simplilearn   
    {  
    
    public static void main (String args[])   
    {  
        System.out.println(100 + 100 +“Simplilearn");   
        System.out.println(“E-Learning Company" + 100 + 100);  
    }  
    }

    The answers for the two print statements are as follows.

    • 200Simplilearn
    • E-Learning Company100100
  • What is the default value stored in Local Variables?

    Neither the Local Variables nor any primitives and Object references have any default value stored in them. 

  • Will the program run if we write static public void main?

    Yes, the program will successfully execute if written so. Because, in Java, there is no specific rule for the order of specifiers