Java / Constructor

What happens when the developer does not implement default constructor?

If there is no constructor in a class, compiler automatically creates a default constructor.

When there are parameterized constructors implemented, compile will not create the default constructor.

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What is a Constructor? Rules for creating a Java constructor. Types of Java constructor. Java Default Constructor. Java parameterized constructor. Advantages of parameterized constructor. What happens when the developer does not implement default constructor? Purpose of default constructor. Constructor Overloading in Java. Copy-Constructor. Difference between constructor and method in Java. What are pass by reference and pass by value? Can constructor perform other tasks instead of initialization? Can a constructor call/invoke a static method? Can a constructor invoke a non-static/instance method? Can abstract class have constructors? What is the access modifier of the Default constructor? Can the class with private constructor be extended? Can the inner class with private constructor be extended? Can you use this() and super() both together in a constructor? Can constructor be synchronized in Java? Is constructor inherited? Can a constructor be final? Can we call the constructor of a class more than once for an object in Java? Is constructor called when cloning in Java? Different ways to create an object in Java. Difference between Class.newInstance() and Constructor.newInstance(). How to Initialize class with Class.forName() that has parameterized constructor? Can you define a method with the same name as the class? What happens when we add a return type to the constructor? Is Constructor definition mandatory? If a class has an explicit constructor, does compiler create default constructor? Can we throw exceptions from a constructor? What are the access modifiers that cannot be applied to a constructor? What is constructor chaining? How do I call subclass constructor from superclass constructor? What is No-arg constructor or default constructor.? Can you declare Constructor as final in Java?

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OOPS Concepts and its implementation in Java 19 Inheritance 29 JDK, JRE, JVM, JIT 69 Java Identifiers 4 Object, Class and Package 44 Variable 9 Local Variables 6 Instance Variables (Non Static Variables) 3 Class Variables (Static Variables) 13 Package 10 Operators 9 Modifiers 29 Data types 10 Methods 39 Control Statements 14 Access Modifiers 5 Constructor 38 Interface 46 Abstract Class 19 Enum 20 Arrays 20 Strings 32 Using String 29 Exception 55 Collections 56 List and its implementations 22 Map and its implementations 39 Set and its implementations 23 Queue and its implementations 4 Regular expressions 3 Design Patterns 75 Generics 20 Casting 5 volatile 13 Java ThreadLocal 10 Java Multithreading 113 Java Multithreading part II 18 final keyword 13 static keyword 16 Java Transactions (JTA) 21 Concurrent collections 55 Java Serialization 36 JDBC 53 JNDI 17 RMI 6 JAXB 10 JMS 45 JMX 9 Servlet Interview Questions 16 log4j 19 Annotations 10 XML 14 Garbage collection 31 Programs 8 JVM 4 Java8 streams 34 JavaFX 6 Autosys Interview questions 21 The Java Virtual Machine: How and What Is It Used For? Java 11 10 Java 12 5 Top Errors You Should Avoid when Studying Programming Java 17 1 JPMS 6 Java Record Keyword 4 MapStruct Java Interview questions Java 21 Interview Questions 46 Lombok Interview questions 48 Quarkus Interview questions 50

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