Latest Tutorials| Questions and Answers|Ask Questions?|Site Map



Home Answers Viewqa Java-Beginners java default constructor

Have Programming Question? Ask it here!
 
 
 


shishira kumar padhan
java default constructor
1 Answer(s)      a year and 6 months ago
Posted in : Java Beginners


suppose i hava a class:

public class Student{ private int rollNo; private String name; }

then what would be the default constructor:

1) public Student(){ private int rollNo = 0; private String name = null; }

or

2) public Student(){ private int rollNo; private String name; }


Advertisement
View Answers

March 8, 2013 at 7:04 PM


hi friend,

Constructors in a class are used to create objects from the class blueprint. new keyword is used to create the space in memory and initializes the fields. So, in the default constructor you can initializ your fields with a value or you can simply create a constructor by calling super().

In your case Constructor of your class should be as follows :

public Student()
{
rollNo = 0; 
name = null;
}


Related Tutorials/Questions & Answers:
java serializable default constructor
java serializable default constructor  java serializable default constructor
java default constructor
java default constructor  suppose i hava a class: public class... be the default constructor: 1) public Student(){ private int rollNo = 0; private... the space in memory and initializes the fields. So, in the default constructor you can
Advertisements
program for default constructor in java
program for default constructor in java   class Box { double l; double b; double h; Box
Java constructor
Java constructor  When does the compiler supply a default constructor for a class
Default constructor generate two random equations
Default constructor generate two random equations  Need to create a default constructor in a programmer defined class that generates a random question, addition or subtraction. And when adding the numbers must be random from 0-12
constructor in java
constructor in java  Ex: public class A { public A(){ System.out.println("A"); } public A(int i){ this(); System.out.println(i); } } public class B extends A{ public B (){ System.out.println("B"); } public B (int i
Java private constructor
Java private constructor  what is private constructor?what are the uses of writing private constructor in our program
Constructor - Java Interview Questions
Java constructor overloading example  I need Java constructor overloading exampleThanks!  Ans1 : You can not override a constructor as they are not inherited. you cannot override a constructor in the same class
constructor overriding - Java Beginners
constructor overriding  Write a program to demonstrate the overriding of constructor methods
constructor - Java Beginners
, A java constructor has the same name as the name of the class to which it belongs. Constructor's syntax does not include a return type, since constructors...constructor  what is constructor? give some simple example what
Constructor - Java Beginners
Constructor  why can use constructor in java .without constructor Can we run program in java..?  to create an object constructor needed..., http://www.roseindia.net/java/ Thanks
Constructor - Java Beginners
Constructor  What is a constructor? What are its special properties?  Hi friend, A constructor, in object oriented programming concept.... It will be called when an object is created for that class. The job of the constructor
constructor - Java Interview Questions
constructor  We cann't override a constructor, i.e., it is almost like a final method, then why cann't we write the constructor as final?  Hi friend, Overriding constructor : * you cannot override
Constructor - Java Beginners
Constructor  Do u have a constructor example program that has... in Constructor : import java.io.*; class another{ another() throws Exception...(); } } For more information on Java visit to : http://www.roseindia.net/java/ Thanks
Constructor in java
links Constructor in Java...When you create a new instance (a new object) of a class using the new keyword, a constructor for that class is called. Constructors are used to initialize
Constructor overloading in java
Constructor overloading in java In this section we will discuss about constructor overloading in java. Constructor overloading is not much different from... is there constructor doesn't have return type in java. How to overload a constructor
constructor
in Java?   Suppose there is a statement: Date today = new Date...: a call to a constructor method. Constructor methods are special methods provided by each Java class that are responsible for initializing new objects
Constructor Overloading in Java
Constructor Overloading in Java     ... the constructor overloading in Java. Constructors are used to assign initial values to instance variables of the class. A default constructor with no arguments
Constructor
Constructor  what is the advantage of a constructor ? not the purpose... the following links: http://www.roseindia.net/java/java-tips/oop/constructors/constructor.shtml http://www.roseindia.net/java/beginners/Construct.shtml
Constructor Overloading in Java
operator. A default constructor however is automatically called by the Java Virtual...In this section we have discussed about Constructor Overloading in Java...;Roseindia", 10); } } Resource: Constructor Overloading in Java
Java Constructor Overloading Example
Java Constructor Overloading Example In this section we will read about the constructor overloading in Java. We will see how the constructor overloading.... As we see earlier that a constructor in Java are the special type of methods
Setting the default Java character encoding?
Setting the default Java character encoding?  Setting the default Java character encoding
Java Constructor
. A default constructor with no arguments will be called automatically by the Java...; constructor. Example of Java Constructor: class another{ int x,y; another...Every Class has at least one constructor, which assign initial values
which package imported by the java compiler by default?
which package imported by the java compiler by default?  which package imported by java by default
Constructor Exception in Java
Constructor Exception in Java   ... that help you in understanding program  for handling Constructor exception.A.... Constructor initializes a new object belonging to the class automatically. The program
Java get default Locale
Java get default Locale     ..., or cultural region. We can get and set our default locale through the java programs. For setting or getting default Locale we need to call static method getDefault
Java get default Charset
Java get default Charset       We can achieve the default charset through the java program...:\javaexamples>java GetDefaultCharset Default encoding is : Cp1252 C
Embed Default Browser within Java Application
Embed Default Browser within Java Application  After some googling i found out about JDIC but i m unable to use it Please guide me how to use JDIC... making IE my default browser but that didnt work Please help
Java - Constructor in java
Java - Constructor in java     .... Constructor creates a instance for the class. Constructor initiates (initialize) something related to the class's methods. Constructor is the method which name is same
set text field appearance to default - Java Beginners
it to its default value. This is the code im using: private Border bordeError = new... is wrong, i set the border to red, if not, i want to leave it default, but i cant
Java Set Default Locale
Java Set Default Locale       Setting Default Locale Example in Java Locale can be set also in our java programs by using the method setDefault() of Locale class
In Java, what's the difference between public, default, protected, and private?
In Java, what's the difference between public, default, protected, and private?  In Java, what's the difference between public, default, protected, and private
constructor in servlet
constructor in servlet  Can we use the constructor, instead of init... the constructor instead of init(). There's nothing to stop you. But you shouldn't. The original reason for init() was that ancient versions of Java couldn't dynamically
Constructor in Servlet.
Constructor in Servlet.  how to write a constructor in Java Servlet?   Servlet is like a POJO .You can create constructor in servlet. You can also use constructor for initialising purpose but it is not a useful approach
Help needed on java standalone app and default browser interaction.
Help needed on java standalone app and default browser interaction.  Hi Developers and tutors, Is anyone able to guide on how am i able to extract the url thats displaying on my default browser to my java standalone application
Toedter JDateChooser JSpinner change day value by default in java
Toedter JDateChooser JSpinner change day value by default in java  i have a question, by default the JSpinner when you press up or down buttons... of the month value by default
call a constructor
call a constructor  How do you call a constructor for a parent class
Hi Friend. on Default Data type Values - Java Beginners
Hi Friend. on Default Data type Values  Hi ... I have doubt on Default Data types... Is it Possible to print the Dafault Values..If it s so, Check this code..How to Print d Default Values
constructor or object
constructor or object  object or construct which create first?   A constructor is always created first. Here is an example: class Example { Example(String st){ System.out.println(st); } public
constructor inheritance
constructor inheritance  can we inherit constructor ?if not then why yhis example is given class A { public A() { System.out.println("In A ctor"); } } class B extends
constructor program
constructor program  write a program to calculate the gross salary and net salary of an employee based on the following attributes: empno,empname,emp address,basic,hra,da,ta,vehicle loan,personel loan use the scanner class
Default Package
Default Package  Can we import default packages???   Yes, you can import the default packages. But there will be no error or exception, if you will not import default packages. Otherwise, importing packages is must
using constructor
using constructor  all constructor for matrix class?   The given code implements the Matrix class and show the addition of two matrices. public class Matrix{ int M; int N
About Constructor
About Constructor  How many objects are create when this code will execute... String string = new String("Java is best Lang."); tell me the number of object of string which will create . All are those are eligible for garbage
Java Constructors
Java Constructors In this tutorial we will discuss in java constructor and its... Constructor : Default constructor is used when you want to automatically initialize... = new Sum(); // Calling default constructor Sum sum2 = new Sum(40, 39); // Calling
Explain the parameters of Font class constructor.
Explain the parameters of Font class constructor.  Explain the parameters of Font class constructor.   Java Font class: Font(String name.... If name is null, the name of the new Font is set to the name "Default". style
What is the difference between a constructor and a method?
What is the difference between a constructor and a method?  Hi, What is the difference between a constructor and a method?   Hi, I have found a good link of Java program related to difference between constructor
Which package is imported by default?
Which package is imported by default?  hi, Which package is imported by default? thanks   hi, It is very important to know Which package is imported by default? The java.lang package is imported by default even
Calling Constructor in Spring
and retrieving the values defined in the constructor using java file.    ... Calling Constructor in Spring       In the given example you will be learning about a constructor
Overloading constructor in flex
Overloading constructor in flex  Hi...... What is overloading a constructor? How do you overload constructors in flex? please tell me about it........... Thanks   Hi..... Action script does not support overloading
Advertisements
 

 

 

DMCA.com