What is constructor and inheritance in Java?

Constructors are used to create objects, while inheritance is used to create new classes from existing ones. The constructor of an object is executed when the object is created, while the superclass constructor is executed first before the subclass constructor can be executed. Inheritance allows us to reuse code in a class without having to rewrite it every time we need it, as well as share functionality across multiple classes without having to re-implement it over and over again.

How do you create a constructor in Java?

Java provides two ways of creating constructors: By using a constructor keyword and specifying the class name in parentheses, followed by the constructor parameters; or By using a static block with the same parameters as above. The first way is more commonly used, because it requires less code to create a constructor in Java.

Course Content

What is Java, Characteristics of Java, Applications of Java, Java Wora Architecture, Java Source file execution Process

38m 14s

How to use LearnVern

3m 20s

Introduction of Java Assignment

54s

Java Introduction Quiz

Installation for JVM, JRE, JDK

Java Development Kit Installation (JDK)

19m 13s

Keywords And Identifiers in Java with Rules

19m 9s

Data Types In Java

27m 29s

Assignment Of Keywords Identifiers Datatypes

39s

Keywords Identifiers And Data Types Quiz

Java Type Casting

21m 23s

Assignment Of Type Casting

20s

What is Variable and its types in Java?

26m 41s

How do you write a variable in Java?

23m 49s

Assignment Of Variable Types

54s

Variable Quiz

Operands And Operators And Expressions in Java

33m 26s

Operands And Operators And Expressions in Java with Example

19m 46s

Bitwise Operator in Java with Practical

25m 37s

Unary Operator, Logical Operator, Ternary Operator in Java with Practical

22m 13s

Assignment Of Operand Operator And Expressions

1m 1s

Decision Making Flow Control And Loops in Java

26m 2s

Decision Making Statements If statement , If else statement in Java with Practical examples

23m 28s

Decision Making Statements If Else If Statement , Switch Statement in Java with Practical

23m 17s

Looping Statements in Java - For Loop, While Loop with Practical

26m 5s

Looping Statements in Java - do While Loop Practical

27m 41s

Looping Statements in Java For Each Loop Practical

17m 5s

Assignment Of Decision Making And Flow Control Statement

1m 3s

Decision Making And Flow Control Quiz

Arrays In Java

14m 38s

Java Arrays Example

13m 34s

Arrays in Java with Practical

31m 42s

Wrapper Class, Autoboxing, Auto Unboxing

29m 9s

Assignment Of Arrays Autoboxing Unboxing

2m 41s

Arrays Autoboxing And Unboxing Quiz

String Class in Java

21m 50s

String Class Methods in Java ( String Buffer Class And String Builder Class)

13m 26s

Assignment Of String literals String Object And Its Methods

1m 5s

String Class An Its Methods Quiz

Classes and Objects In Java

24m 43s

Assignment Of Class And Object

48s

Class And Object Quiz

Java Methods

34m 57s

Assignment Of Method

48s

Methods Quiz

Hello World Program in Java

19m 53s

Hello World Program in Java with practical

18m 25s

Hello World Program in Java with Practical (Part 2)

34m 9s

Assignment Of Hello World Program

44s

Constructors in Inheritance in Java

25m 43s

Access Modifiers in Java

21m 11s

Constructor in Java

33m 48s

Types of Inheritance in Java ( Single, Multi level)

22m 6s

Types of Inheritance in Java ( Hierarchical, hybrid)

26m 26s

Generalization in Java, Super Keyword in Java

41m 32s

Super Keyword in Java And Constructor Chaining in Java

35m

Assignment Of Access Modifer Constructor And Inheritance

1m 54s

Constructor and Inheritance Quiz

Composition In Java

8m 15s

Encapsulation In Java

48m 26s

Up-Casting, Down-Casting In Java

25m 31s

Compile Time Polymorphism In Java

30m 26s

Runtime Polymorphism In Java

25m 36s

Assignment Of Composition Encapsulation And Polymorphism

1m 23s

Composition Encapsulation And Polymorphism Quiz

Abstraction And Interface in Java

23m 9s

Abstraction And Interface in Java with practical

25m 3s

Final Keyword in Java with Practical

12m 20s

Abstract Class in Java with Practical

27m 58s

Interface in Java with Practical

33m 52s

Interface Types in Java

43m 19s

Inner Class in Java

22m 14s

Java Inner Classes with Examples

30m 34s

Java Inner Classes with Practical

21m 30s

Assignment Of Abstraction Interface And Inner Class

1m 54s

Abstraction Interface And Inner Class Quiz

Packages in Java

20m 16s

Exception Handling in Java

36m 50s

Java Exceptional Handling with Practical

28m 27s

Exception Handling Types in Java (Try , Catch And Finally Block With Unchecked Type Exception)

28m 28s

Exceptional Handling Type in Java (Multi Catch Block ,Checked Exception ,Throws Keyword)

38m 30s

Exception Handling Types in Java (Throw Keyword And Custom Exception)

31m 16s

Assignment Of Package Exception Handling

1m 47s

Packages And Exception Handling Quiz

Java IO Basics , Byte Stream, File Input Stream in Java And Its Methods, Java Escape Sequences Theory

25m 48s

File Output Stream in Java And Its Methods

17m 51s

Serialization And Deserialization in Java

11m 1s

File Output Stream Practical To Write Data To External File

40m 59s

File Input Stream Practical To Read The Data From External File

14m 57s

Serialization Practical Write Object To External File

17m 21s

Deserialization Practical Read Object From External File, Transient Keyword

14m 6s

Java IO Character Stream Theory And Practical

19m 10s

Assignment Of Java IO

1m 15s

Java IO Quiz

Collection Framework In Java

17m 50s

Collections Hierarchy in Java

20m 37s

Java List Interface

8m 58s

Arraylist in Java

12m 35s

Array List With Example

36m 40s

Linked List in java

17m 54s

Vector in Java

21m 14s

Stack in Java

32m 15s

Set And HashSet in Java

20m 48s

LinkedHashSet And TreeSet in Java

21m 35s

Iterable Interface in Java

18m 13s

Map Interface and HashMap in Java

18m 15s

Map Interface HashMap With Example

27m 39s

Treemap in Java

28m 54s

Comparable Interface in Java

27m 39s

Understanding Comparator Interface in Java with Example

17m 39s

Assignment Of Java Collection Framework

2m 30s

Java Collection Framework Quiz

Java Threads

31m 33s

Understanding Threading In Java Using Extending Thread Class

24m 57s

Threading with Runnable Interface

24m 35s

Join Method

12m 27s

Synchronization

15m 48s

Synchronization With Example

20m 19s

Inter Thread Communication

26m 59s

Assignment Of Java Threading

1m 37s

Java Threading Quiz

Java Regex Theory 1

27m 49s

Java Regex Theory 2

19m 23s

Regular Expression With Example 1

22m 33s

Regular Expression With Example 2

24m 25s

Java Regex Validate Contact No

33m 20s

Java Regex And Or Not With Matcher Class Method

18m 43s

Java Regex Validate Email ID

21m 15s

Assignment Of Java Regex

1m 55s

Java Regex Quiz

Lambda Expression in Java

28m 20s

Lambda Expression part 2

25m 47s

Lambda Expression part 3

21m 26s

Predicate in Java

26m 3s

Consumer Interface In Java

30m 3s

Supplier Interace In Java

18m 1s

Stream Filter Method In Java

21m 55s

Stream Other Methods In Java

46m 30s

Assignment Of Lambda Expression

45s

Lambda Expressions Quiz

Java Wrap Up

36s

Part 1

14m 41s

Part 2

28m 13s

Part 3

30m 28s

Part 4

23m 30s

Part 5

28m 36s

Part 6

29m 3s

Part 7

28m

Part 8

29m 35s

Part 9

25m 57s

Part 10

29m 23s

Part 11

26m 23s

Part 12

27m 52s

Part 13

16m 2s

Part 14

29m 53s

Part 15

28m 19s

Part 16

28m 16s

part 17

26m 15s

Interview Questions on Introduction

14m 10s

Interview Question Of Class And Object

12m 55s

Interview Question Of Keywords, Identifiers And Data Types

7m 35s

Interview Question Variables

12m 59s

Interview Question Methods

7m 31s

Interview Question Of Hello World Program

6m 32s

Interview Questions on Loop

7m 40s

Interview Question Constructor And inheritance

9m 15s

Interview Question on Polymorphism

4m 42s

Interview Question Of Abstraction, Interface and Inner class

7m 27s

Interview Question on Exception Handling

7m 20s

Interview Question Of String class an its Methods

6m 52s

Interview Question Of Arrays, autoboxing and unboxing

8m 39s

Interview Question Of Collection Framework

7m 43s

Interview Question Of Java Threading

13m 18s

Interview Question Of Regular Expressions

6m 4s

Interview Question Constructor And inheritance

Core Java Course Interview Question In Java

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Discussion

Course Content

What is Java, Characteristics of Java, Applications of Java, Java Wora Architecture, Java Source file execution Process

38m 14s

How to use LearnVern

3m 20s

Introduction of Java Assignment

54s

Installation for JVM, JRE, JDK

Java Development Kit Installation (JDK)

19m 13s

Keywords And Identifiers in Java with Rules

19m 9s

Data Types In Java

27m 29s

Assignment Of Keywords Identifiers Datatypes

39s

Java Type Casting

21m 23s

Assignment Of Type Casting

20s

What is Variable and its types in Java?

26m 41s

How do you write a variable in Java?

23m 49s

Assignment Of Variable Types

54s

Operands And Operators And Expressions in Java

33m 26s

Operands And Operators And Expressions in Java with Example

19m 46s

Bitwise Operator in Java with Practical

25m 37s

Unary Operator, Logical Operator, Ternary Operator in Java with Practical

22m 13s

Assignment Of Operand Operator And Expressions

1m 1s

Decision Making Flow Control And Loops in Java

26m 2s

Decision Making Statements If statement , If else statement in Java with Practical examples

23m 28s

Decision Making Statements If Else If Statement , Switch Statement in Java with Practical

23m 17s

Looping Statements in Java - For Loop, While Loop with Practical

26m 5s

Looping Statements in Java - do While Loop Practical

27m 41s

Looping Statements in Java For Each Loop Practical

17m 5s

Assignment Of Decision Making And Flow Control Statement

1m 3s

Arrays In Java

14m 38s

Java Arrays Example

13m 34s

Arrays in Java with Practical

31m 42s

Wrapper Class, Autoboxing, Auto Unboxing

29m 9s

Assignment Of Arrays Autoboxing Unboxing

2m 41s

String Class in Java

21m 50s

String Class Methods in Java ( String Buffer Class And String Builder Class)

13m 26s

Assignment Of String literals String Object And Its Methods

1m 5s

Classes and Objects In Java

24m 43s

Assignment Of Class And Object

48s

Java Methods

34m 57s

Assignment Of Method

48s

Hello World Program in Java

19m 53s

Hello World Program in Java with practical

18m 25s

Hello World Program in Java with Practical (Part 2)

34m 9s

Assignment Of Hello World Program

44s

Constructors in Inheritance in Java

25m 43s

Access Modifiers in Java

21m 11s

Constructor in Java

33m 48s

Types of Inheritance in Java ( Single, Multi level)

22m 6s

Types of Inheritance in Java ( Hierarchical, hybrid)

26m 26s

Generalization in Java, Super Keyword in Java

41m 32s

Super Keyword in Java And Constructor Chaining in Java

35m

Assignment Of Access Modifer Constructor And Inheritance

1m 54s

Composition In Java

8m 15s

Encapsulation In Java

48m 26s

Up-Casting, Down-Casting In Java

25m 31s

Compile Time Polymorphism In Java

30m 26s

Runtime Polymorphism In Java

25m 36s

Assignment Of Composition Encapsulation And Polymorphism

1m 23s

Abstraction And Interface in Java

23m 9s

Abstraction And Interface in Java with practical

25m 3s

Final Keyword in Java with Practical

12m 20s

Abstract Class in Java with Practical

27m 58s

Interface in Java with Practical

33m 52s

Interface Types in Java

43m 19s

Inner Class in Java

22m 14s

Java Inner Classes with Examples

30m 34s

Java Inner Classes with Practical

21m 30s

Assignment Of Abstraction Interface And Inner Class

1m 54s

Packages in Java

20m 16s

Exception Handling in Java

36m 50s

Java Exceptional Handling with Practical

28m 27s

Exception Handling Types in Java (Try , Catch And Finally Block With Unchecked Type Exception)

28m 28s

Exceptional Handling Type in Java (Multi Catch Block ,Checked Exception ,Throws Keyword)

38m 30s

Exception Handling Types in Java (Throw Keyword And Custom Exception)

31m 16s

Assignment Of Package Exception Handling

1m 47s

Java IO Basics , Byte Stream, File Input Stream in Java And Its Methods, Java Escape Sequences Theory

25m 48s

File Output Stream in Java And Its Methods

17m 51s

Serialization And Deserialization in Java

11m 1s

File Output Stream Practical To Write Data To External File

40m 59s

File Input Stream Practical To Read The Data From External File

14m 57s

Serialization Practical Write Object To External File

17m 21s

Deserialization Practical Read Object From External File, Transient Keyword

14m 6s

Java IO Character Stream Theory And Practical

19m 10s

Assignment Of Java IO

1m 15s

Collection Framework In Java

17m 50s

Collections Hierarchy in Java

20m 37s

Java List Interface

8m 58s

Arraylist in Java

12m 35s

Array List With Example

36m 40s

Linked List in java

17m 54s

Vector in Java

21m 14s

Stack in Java

32m 15s

Set And HashSet in Java

20m 48s

LinkedHashSet And TreeSet in Java

21m 35s

Iterable Interface in Java

18m 13s

Map Interface and HashMap in Java

18m 15s

Map Interface HashMap With Example

27m 39s

Treemap in Java

28m 54s

Comparable Interface in Java

27m 39s

Understanding Comparator Interface in Java with Example

17m 39s

Assignment Of Java Collection Framework

2m 30s

Java Threads

31m 33s

Understanding Threading In Java Using Extending Thread Class

24m 57s

Threading with Runnable Interface

24m 35s

Join Method

12m 27s

Synchronization

15m 48s

Synchronization With Example

20m 19s

Inter Thread Communication

26m 59s

Assignment Of Java Threading

1m 37s

Java Regex Theory 1

27m 49s

Java Regex Theory 2

19m 23s

Regular Expression With Example 1

22m 33s

Regular Expression With Example 2

24m 25s

Java Regex Validate Contact No

33m 20s

Java Regex And Or Not With Matcher Class Method

18m 43s

Java Regex Validate Email ID

21m 15s

Assignment Of Java Regex

1m 55s

Lambda Expression in Java

28m 20s

Lambda Expression part 2

25m 47s

Lambda Expression part 3

21m 26s

Predicate in Java

26m 3s

Consumer Interface In Java

30m 3s

Supplier Interace In Java

18m 1s

Stream Filter Method In Java

21m 55s

Stream Other Methods In Java

46m 30s

Assignment Of Lambda Expression

45s

Java Wrap Up

36s

Part 1

14m 41s

Part 2

28m 13s

Part 3

30m 28s

Part 4

23m 30s

Part 5

28m 36s

Part 6

29m 3s

Part 7

28m

Part 8

29m 35s

Part 9

25m 57s

Part 10

29m 23s

Part 11

26m 23s

Part 12

27m 52s

Part 13

16m 2s

Part 14

29m 53s

Part 15

28m 19s

Part 16

28m 16s

part 17

26m 15s

Interview Questions on Introduction

14m 10s

Interview Question Of Class And Object

12m 55s

Interview Question Of Keywords, Identifiers And Data Types

7m 35s

Interview Question Variables

12m 59s

Interview Question Methods

7m 31s

Interview Question Of Hello World Program

6m 32s

Interview Questions on Loop

7m 40s

Interview Question Constructor And inheritance

9m 15s

Interview Question on Polymorphism

4m 42s

Interview Question Of Abstraction, Interface and Inner class

7m 27s

Interview Question on Exception Handling

7m 20s

Interview Question Of String class an its Methods

6m 52s

Interview Question Of Arrays, autoboxing and unboxing

8m 39s

Interview Question Of Collection Framework

7m 43s

Interview Question Of Java Threading

13m 18s

Interview Question Of Regular Expressions

6m 4s

FAQs

Constructors are used to create objects, while inheritance is used to create new classes from existing ones. The constructor of an object is executed when the object is created, while the superclass constructor is executed first before the subclass constructor can be executed.
Inheritance allows us to reuse code in a class without having to rewrite it every time we need it, as well as share functionality across multiple classes without having to re-implement it over and over again.

Java provides two ways of creating constructors:

By using a constructor keyword and specifying the class name in parentheses, followed by the constructor parameters; or
By using a static block with the same parameters as above.

The first way is more commonly used, because it requires less code to create a constructor in Java.

A function Object() { [native code] } is similar to a method in that it is called when a class object is created. It is typically used to initialise a class's instance variables. The constructors have the same name as the class they belong to and no return type.

Constructors have access to all fields and methods of a class that is being created. They are also responsible for initializing these fields and methods with default values when they are not specified in the constructor parameters. Constructor parameters must always be specified in the order in which they appear in the source code.

There are many benefits to inheritance, but one of the most important ones is that it makes your classes more reusable. You can inherit from a base class and then use that as a template for creating new classes with different properties or behaviors.