Programs using custom classes,constructors

   program with custom class (name, salary, new name)

package com.company;
import java. util.Scanner;
class employee {
    int salary;
    String name;
    public void su() {
        System.out.println("salary is" + salary);
    }
    public void nm() {
        System.out.println("name is"+name);
    }
    public void setn(){
        System.out.println("new name is "+ name);
    }
}
public class custom_class {
    public static void main(String[] args) {
        Scanner s= new Scanner(System.in);
        employee e = new employee();
        e.salary = 10000;
        e.name = "vishal rana";

        e.su();
        e. nm();

        System.out.println("enter the new name");
        String n= s.nextLine();
        e.name=n;
        e.setn();
    }
}

program to find the area, parameter of the square using class.

package com.company;
class square{
    int side;
    public void sid()
    {
        System.out.println("side of square is "+side);
    }
    public void parameter()
    {
        System.out.println("parameter of the square is "+ 4*side);
    }
    public void area(){
        System.out.println("area of the square is "+ side*side);
    }
}
public class class_square {
    public static void main(String[] args) {
        square s=new square();
        s.side =8;
        s.sid();
        s.parameter();
        s.area();
    }
}

program to find the area, parameter of the rectangle using class.

package com.company;
class rectangle{
    int len;
    int wid;
    public void sid()
    {
        System.out.println("length of rectangle is "+len);
        System.out.println("width of rectangle is "+wid);
    }
    public void parameter()
    {
        System.out.println("parameter of the rectangle is "+ 2*(len+wid));
    }
    public void area(){
        System.out.println("area of the rectangle is "+ len*wid);
    }
}
public class class_square {
    public static void main(String[] args) {
         rectangle r=new rectangle();
        r.len =8;
        r.wid=4;
        r.sid();
        r.parameter();
        r.area();
    }
}

program to add two numbers using constructors 

package com.company;
class cls{
    private int  a=0,b=0;
    public void  asign(){
        a=5;
        b=3;
        System.out.println(a+b);
    }
    cls(){
        System.out.println("sum of the two numbers is: ");
    }
}
public class constructors {
    public static void main(String[] args) {
        cls c= new cls();
        c.asign();
    }
}