How is the process of obtaining a hash code implemented in an object?

The process of obtaining an object's hash code in Android (Java/Kotlin) is implemented through the hashCode() method, which returns an integer value representing the object.

By default, the hashCode() method in the Object class returns a value based on the internal memory address of the object, but for user-defined classes, it is recommended to override this method to ensure correct comparison and usage in collections such as HashMap.

Example of overriding hashCode() along with equals():

@Override
public int hashCode() {
    int result = 17;
    result = 31 * result + (field1 != null ? field1.hashCode() : 0);
    result = 31 * result + field2;
    return result;
}

@Override
public boolean equals(Object obj) {
    if (this == obj) return true;
    if (obj == null || getClass() != obj.getClass()) return false;
    MyClass other = (MyClass) obj;
    return Objects.equals(field1, other.field1) && field2 == other.field2;
}

Here, hashCode() computes the hash based on the object's field values, allowing the object to be used correctly in hash data structures.