Category: Java Interview Questions

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

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

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.

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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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

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

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

Stack memory in data structures is the amount of memory allocated to each individual programme. It is a fixed memory space. Heap memory, in contrast, is the portion that was not assigned to the Java code but will be available for use by the Java code when it is required, which is generally during the program’s runtime.

Java has five significant types of memory allocations.

• Class Memory
• Heap Memory
• Stack Memory
• Program Counter-Memory
• Native Method Stack Memory

A classloader in Java is a subsystem of Java Virtual Machine, dedicated to loading class files when a program is executed; ClassLoader is the first to load the executable file.

Java has Bootstrap, Extension, and Application classloaders.