InheritedSharing.java

/**
 * This class will run in with sharing context if
 * -It is visualforce page controller
 * -It is entrypoint in the transaction (like api)
 * This class will run in without sharing context if
 * -It is being called from another class having without shring permission
 **/

public inherited sharing class InheritedSharing{
    public List<Contact> getAllTheSecrets(){
        return [SELECT Name FROM Contact];
    }
}