Write a Java Program to define a class, describe its constructor, overload the Constructors and instantiate its object.

Write a Java Program to define a class, describe its constructor, overload the Constructors and instantiate its object.

Program Code:

import java.lang.*;

class student

{

String name;

int regno;

int marks1,marks2,marks3;

// null constructor

student()

{

name="raju";

regno=12345;

marks1=56;

marks2=47;

marks3=78;

}

// parameterized constructor

student(String n,int r,int m1,int m2,int m3)

{

name=n;

regno=r;

marks1=m1;

marks2=m2;

marks3=m3;

}

// copy constructor

student(student s)

{

name=s.name;

regno=s.regno;

marks1=s.marks1;

marks2=s.marks2;

marks3=s.marks3;

}

void display()

{

System.out.println(name + "\t" +regno+ "\t" +marks1+ "\t" +marks2+ "\t" + marks3);

}

}

class studentdemo

{

public static void main(String arg[])

{

student s1=new student();

student s2=new student("john", 34266, 58, 96, 84);

student s3=new student(s1);

s1.display();

s2.display();

s3.display();

}

}

Output:

raju 12345  56  47  78

john 34266 58  96  84

raju 12345  56  47  78