import java.util.*;
import java.lang.*;
import java.io.*;

// The main method must be in a class named "Main".

  class Students {
       int id;
       String name;
       int age;
    
    // we create a new method in class
      
      public void studentDetails(){
          
          System.out.println("My id num is "+ id);
          System.out.println("My name is "+ name);
          
      }
    
     public void studentAge(){
          System.out.println("The age of "+name+" is="+age);
 
      }
          
          
      
      
      
  }
public class Main {

    public static void main(String[] args) {
        System.out.println("Hello world!");
     
        Students raju = new Students (); // theese are object 
        Students vishu = new Students ();// we can create unlimited object,
        Students age = new Students ();                             // in a class
       
         vishu.id = 01;
         vishu.name = "vishal singh";
         raju.id= 03;
         raju.name="raj nagar";
         vishu.age =19;
         raju.age=16;
         
       // we cannot print like this
       //  System.out.println(vishu.id);
 
        // use method
        
         vishu.studentDetails();
         raju.studentDetails();
         raju.studentAge();
    }
}