/**

* The == operator is used to compare two primitive data types.

* If it is used with references, it checks whether two references are refering the same object.

*

* @author L.Gobinath

*/

public class EqualityOperator {

public static void main(String[] args) {

Student stu1 = new Student(100);

Student stu2 = new Student(100);

Student stu3 = stu1;

if (stu1 == stu2) { // false

System.out.println("stu1 == stu2");

}

if (stu1.equals(stu2)) { // true

System.out.println("stu1 equals stu2");

}

if (stu1 == stu3) { // true

System.out.println("stu1 == stu3");

}

}

}

class Student {

int index;

public Student(int index) {

this.index = index;

}

@Override

public boolean equals(Object obj) {

if (obj instanceof Student) {

Student stu = (Student) obj;

if (stu.index == this.index) {

return true;

}

}

return false;

}

}