Java-Abstract Class

Java-Abstract Class

Can a abstract class have a constructor ?When would the constructor in the abstract class be called ?
Please give me with good example code..Please implement the example with code. THanks in advance.
View Answers

August 20, 2010 at 1:12 PM

Hi Friend,

Yes. But Abstract class constructors will be called when its concrete subclass will be instantiated.

For ex:

abstract class MyAbstractClass {

MyAbstractClass(){

System.out.println("I am abstract class constructor");
}

public abstract void show();
public void display(){
System.out.println("display() method in Abstract Class");
}
}

public class Value extends MyAbstractClass{
public void show() {
System.out.println("I am show method");

}
public static void main(String[] args) {

MyAbstractClass cl = new Value();
cl.display();
cl.show();
}
}

Thanks









Related Tutorials/Questions & Answers:
Java abstract class
Java abstract class  Can an abstract class be final
java abstract class - Development process
java abstract class  how to save and run abstract class program in java?please immediately reply sir.  Hi Friend, Consider the following example, abstract class A { abstract void hi(); void hello
Advertisements
Java-Abstract Class - Java Beginners
Java-Abstract Class  Can a abstract class have a constructor ?When would the constructor in the abstract class be called ? Please give me with good...; Hi Friend, Yes. But Abstract class constructors will be called when its
Java Abstract Class
Java Abstract Class       An abstract class is a class that is declared by using the abstract keyword...;  --or--ADS_TO_REPLACE_1 Java provides a special type of class called
Java Abstract Class Example
Java Abstract Class Example In this section we will read about the Abstract class. Abstract class in Java is a class which is created for abstracting the behaviour of classes from the outside environment. Abstract class can be created
class
class  Is a class a subclass of itself
abstract class
abstract class   Explain the concept of abstract class and it?s use with a sample program.   Java Abstract Class An abstract class is a class that is declared by using the abstract keyword. It may or may not have
Abstract class
Abstract class  j   An Abstract class is a base class which...://www.roseindia.net/help/java/a/java-abstract-class.shtml http://www.roseindia.net/java/master-java/abstract-class.shtml
class
is a class to represent a country in medal tally. It has an attribute of country... medals. In this class, you should also define constructors, and assessor, mutator methods. Task 2 MedalTally.java is a class to model a medal tally, containing
Class
Class, Object and Methods       Class : Whatever we can see in this world all the things... is termed as a class. All the objects are direct interacted with its class
abstract class
abstract class  what is abstract class .why we use it or what is the need of this class?   Abstract class is like base class which... the following links: http://www.roseindia.net/help/java/a/java-abstract-class.shtml
Explain final class, abstract class and super class.
Explain final class, abstract class and super class.  Explain final class, abstract class and super class.   Explain final class, abstract.... An abstract class is a class that is declared by using the abstract keyword. It may
Interface and Abstract class
and Abstract Class 1)Main difference is methods of a Java interface are implicitly abstract and cannot have implementations. A Java abstract class can have instance...)Members of a Java interface are public by default. A Java abstract class can have
abstract class - Java Interview Questions
abstract class  Explain the abstract class and abstract method...://www.roseindia.net/java/master-java/abstract-class.shtml http://www.roseindia.net/help/java/a/java-abstract-class.shtml Hope that it will be helpful for you. Thanks
Super class of an Exception class
Super class of an Exception class  hello,,, What is super class of an Exception class?   hii,,ADS_TO_REPLACE_1 the super class of an exception is throwable class. and the super class of an throwable class
Class
Class       This section explores the concept of a class in reference to object oriented programming techniques. A class defines the properties of  objects and methods used
class loaders
class loaders   Explain static and dynamic class loaders
class file
class file  How to create class file in jsf easily
.class and .tld
.class and .tld  how to create .class and .tld file
inner class
inner class  what is mean by inner class   Inner class is a non-static class which is defined inside another class
Node class
Node class   hii, What is a node class?   hello,ADS_TO_REPLACE_1 A node class is a class that has added new services or functionality beyond the services inherited from its base class
objective c extending a class with a class
objective c extending a class with a class  I need an example for extending a class with a class in objective c. thanks
objective c extending a class with a class
objective c extending a class with a class  I need an example for extending a class with a class in objective c. thanks
Matrix Class
Matrix Class   A class to manage matrices and add them. Create in the driver class two objects of it and use the add method
Matrix Class
Matrix Class   A class to manage matrices and add them. Create in the driver class two objects of it and use the add method
printstrim class
printstrim class  discribe PrintStream class
lock on a class
lock on a class  hello, Can a lock be acquired on a class?   hiii,,ADS_TO_REPLACE_1 Yes, a lock can be acquired on a class. This lock is acquired on the class's Class object
immutable class
immutable class  How to make a class immutable
singleton class
singleton class  What is singleton class
Abstract class
Abstract class  what is an Abstract class
wrapper class
wrapper class  wrapper class methods
printstrim class
printstrim class  discribe PrintStream class
Java class
Java class  What is the purpose of the Runtime class
Locale class
Locale class  What is the Locale class
Abstract class
Abstract class  Can an abstract class be final
wrapper class
wrapper class  list wrapper class methods
robot class
robot class  please send me uses of robot class and some examples using robot class
Nested class
Nested class  What is nested class?  when a class is defined within another class then such a class is called a nested class. Nested classes are a feature of Java that is included in jdk1.1. The reasons of why we use
class file
class file  how to convert java classfile into java sourcefile
abstract class
abstract class  Can there be an abstract class with no abstract methods
java.sql.DriverManager class
java.sql.DriverManager class  Why isn't the java.sql.DriverManager class being found
Adapter Class
Adapter Class  Hello Everybody, Can anybody help me to describe what is Adapter class and when to use this class and give a suitable example... visit the following links: What is Adapter Class Example of Adapter Class
create a class
create a class  plz provide any example related to class
super class
super class  which is the super base class in java
wrapper class
wrapper class  why wrapper class does not have a default constructor
Wrapper Class
Wrapper Class  what is wrapper class in java and why we use it   Hi Friend, Wrapper class is a wrapper around a primitive data type... as a Boolean class instance. All of the primitive wrapper classes in Java
GregorianCalendar class
GregorianCalendar class   hello,, What is the GregorianCalendar class?   hii,ADS_TO_REPLACE_1 The GregorianCalendar provides support for traditional Western calendars
Dictionary class
Dictionary class  hello,, What is the Dictionary class?   hii,,ADS_TO_REPLACE_1 The Dictionary class provides the capability to store key-value pairs
abstract class
abstract class  abstract class AbstractClass{ } is possible and compile the class or any compile time error occur tell me the answer Blockquote
Sealed class
Sealed class  Hi........ What are sealed class? Please give an example Thanks  Ans: Sealed class: Sealed classes conserve memory..., and the compiler can provide better error feedback. The class which is not dynamic

Ads