How to create parameterized constructors in java

2.Parameterized constructor:-A constructor that hava parameters is known as parameterized constructor.
 
class Cons{

int x,y;

Cons(int a, int b){

x=a;

y=b;

}

public void mult(){

int m=x*y;

System.out.println("Multiplication of two numbers is "+m);

}

public static void main(String args[]){

Cons obj=new Cons(5,4);

obj.mult();

}

}

OUTPUT:- 

C:\Users\Satyendra\Desktop>javac 1.java

C:\Users\Satyendra\Desktop>java Cons

Multiplication of two numbers is 20

How to create constructors in java

Constructors :-A constructor is a special method that is used to initialize an object.

Rules for creating constructors:

• Constructor name must be same as its class name.
• Constructor has no return type. 

 Constructors are two types:

1. Default Constructor
2. Parameterized Constructor

1.Default Constructor:-A constructor that have no parameter is known as default constructor.

class Cons{

int x,y;

Cons(){

x=5;

y=6;

}

public void sum(){

int s=x+y;

System.out.println("Addition of two numbers is : "+s);

}

public static void main(String args[]){

Cons obj=new Cons();

obj.sum();

}

}

OUTPUT:-

C:\Users\Satyendra\Desktop>javac 1.java

C:\Users\Satyendra\Desktop>java Cons

Addition of two numbers is : 11

How to create methods in java

class Main{

public void sum(){

int i=5;

int j=6;

int s=i+j;

System.out.println("Sum of the two numbers : "+s);

}

public void mult(int a, int b){

int c;

int d;

c=a;

d=b;

int mult=c*d;

System.out.println("Multiplication of two numbers : "+mult);

}

public static void main(String args[]){

Main obj1=new Main();

Main obj2=new Main();

obj1.sum();

obj2.mult(5,4);

}

}

OUTPUT:- 

C:\Users\Satyendra\Desktop>javac 1.java

C:\Users\Satyendra\Desktop>java Main

Sum of the two numbers : 11

Multiplication of two numbers : 20