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Java - Constructor in java

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In this section you will learn how to implement the constructor feature in a class.

Java - Constructor in java

     

Every class has at least one it's own constructort. 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 to the class. But there are many difference between the method (function) and the Constructor.

In this example we will see that how to to implement the constructor feature in a class. This program is using two classes. First class is another and second is the main class which name is Construct. In the Construct class two objects (a and b) are created by using the overloaded another Constructor by passing different arguments and calculated the are of the different rectangle by passing different values for the another constructor.

Here is the code of the program : 

class another{
  
int x,y;
  another(
int a, int b){
  x = a;
  y = b;
  }
  another(){
  }
 
 int area(){
  int ar = x*y;
 
 return(ar);
  }
}
public class Construct{
 
  public static void main(String[] args)
 {
 another b = 
new another();
 b.x =
 2;
 b.y =
 3;
 System.out.println("Area of rectangle : " + b.area());
 System.out.println("Value of y in another class : " + b.y);
 another a = 
new another(1,1);
 System.out.println("Area of rectangle : " + a.area());
 System.out.println("Value of x in another class : " + a.x);
 }
}

Output of the program : 

C:\chandan>javac Construct.java

C:\chandan>java Construct
Area of rectangle : 6
Value of x in another class : 3
Area of rectangle : 1
Value of x in another class : 1

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Posted on: June 7, 2007

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Comments
jhon
August 12, 2011
thanks

thanks for the help
Rajesh
August 16, 2011
Roseindia is useful for me ...

whenever i have search something related the program in java i find the simple and understandable concepts and program example in Roseindia...( program with output is very useful for me ) i feel better... Thanks Roseindia teams ...
rakesh kumar
August 31, 2011
java

why we need to use cunstructor in java???
himanshu
October 28, 2011
constructor

can values be passed by reference in java like another a = new another(x,y);
sneha
January 25, 2013
about classes in java

SIR COULD YOU PLS LET ME SAY ABOUT THIS
Atul Monga
January 20, 2012
JAVA

Study Matrial provide and Objective type questions
n.rajesh
January 23, 2012
java

what is costructor & syntax
dee
May 3, 2012
output is this

Area of rectangle : 6 Value of y in another class : 3 Area of rectangle : 1 Value of x in another class : 1
anjaly
June 4, 2012
java constructor

well explanation..its easy to understand..i like this website..useful...im happy...keep it up
rahul
June 24, 2012
constructor

what s this
sruthi
July 5, 2012
constructors, usage of setters and getters in java

I need a detailed explanation abt constructors and setter,getter methods in java....can you just give me an explanation in these topics
kanukuntla srinivas
July 9, 2012
constructor

sir i want constroctor simply finding
kanukuntla srinivas
July 9, 2012
constructor

Anoter() what is the mean by this programme...
belle jema
August 27, 2012
hi

i would like to learn more about this method...hehe. LIKE!
nasiba panwar
May 15, 2013
Java - Constructor in java

fully detail study about java
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