Importance of equals and hashcode method override
Importance of equals and hashcode method override: Both equals and hashcode method present in java.lang.Object, hence these methods available for all java classes. When comparing the objects, these methods are used. Default implentation: equals -> checks two objects are pointing same memory location (== check) hashcode -> returns an integer representation of the object memory address. By default, this method returns a random integer that is unique for each instance. This integer might change between several executions of the application and won't stay the same. Note : "If two objects are equal according to the equals(Object) method, then calling the hashcode() method on each of the two objects must produce the same integer result." Example: We will define Student class with and without overriding equals & hashcode. Student.java public class Student { private int id; ...