//object is an instance of a class

//lets write a class called student

public class Student{

int rollno;

String name;

char gender;

double gpa;

//lets write a constructor

public Student(int rollno, String name, char gender, double gpa){

this.rollno = rollno;

this.name = name;

this.gender = gender;

this.gpa = gpa;

}

public void setId(int id){

this.rollno = id;

}

public void setName(String name){

this.name = name;

}

public double getGPA(){

return gpa;

}

public char getGender(){

return gender;

}

public static void main(String[] args) {

Student s1 = new Student(19,"ram", 'M', 9.5);//creating a student object

Student s2 = new Student(21, "Sarvani", 'F', 9.62);//creating a student object using constructor

//now we can add and access student details using student object

s1.setId(20);

s1.setName("John");

System.out.println("Id: " + s1.rollno + " Name: "+ s1.name+" gender: " + s1.gender+" gpa: "+ s1.gpa);

System.out.println("Id: " + s2.rollno + " Name: "+ s2.name+" gender: " + s2.gender+" gpa: "+ s2.gpa);

System.out.println(s1 instanceof Student);// displays true or false

}

}