class
Class is a model for creating objects. This means the properties and actions of the objects are written in the class. Properties are represented by variables and actions of the object are represented by methods. So a class contains variables and methods.

Class is a group of objects that has common properties. It is a template or blueprint from which objects are created. The keyword class is used to declare a class.
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Object
1.Object is a realworld entity. Object orientation is methodology to design a program by using classes and objects.
2. Object is physical entity where as class is a logical entity.
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Class and Object
class Student
{
//constructor 
Student(int a,int b) 
{ 
System.out.print(a);
System.out.print(b);
} 
public static void main(String[] args) 
{
Student t=new Student(100,200); 
} 
};
Output :
output:100,,200