OverviewConstruct a hierarchy of classes representing savings and checking accounts as well as a means to ‘filter’account objects.Account ClassesYour solution will consist of 4 account classes as described below. It is your responsibility to define theexact relationship among those classes and translate that relationship into source code structure. There is acorrect structure; the skeleton must be modified to reflect the correct relationships. Account – represents a general account with basic operations such as deposit, withdraw, etc. Savings – represents a savings account that must maintain a minimum balance. Checking – represents a checking account that has no minimum balance (this means a zerobalance). CappedChecking – represents a checking account that disallows a balance above a particularmaximum value.Linking AccountsA bank or credit typically allows a user the ability to link accounts together. That is, I might wish to linkmy checking account with my savings account. If I overdraw from my savings account, then the appropriateamount of money is transferred from my savings account into my checking account to prevent against theoverdraw. In this program we wish to simulate this concept with the following requirements: A checking account may only be linked to a savings account (and vice versa). An account may only be linked to one other account. An account may not be linked to itself. An account may exist without a link to another account.In this program, we consider a link to be bidirectional; that is, if account A is linked to account B, then Bis only linked to account A. If the user wishes to link account C to A, then the bidirectional link from A toB must be unlinked before A is then linked to C.Depositing / Withdrawing Funds and ExceptionsIn this program we will use the following rule for deposits: if a deposit operation is unsuccessful aLinkAccountException will be thrown. For example, if a deposit exceeds the maximum amountallowed in the account and the account is not linked, an exception will be thrown. If the account is linked,the remaining monies will be transferred to the linked account.If a withdrawal operation is unsuccessful an InsufficientFundsException will be thrown. Forexample, if a withdrawal exceeds the minimum of an account (and its linked account), an exception shallbe thrown. In the case that a withdrawal results in an account dropping below the minimum, an appropriateamount of funds shall be transferred from the linked account to the current account in order to attain theminimum balance.FilteringIn database computations, it is often necessary to filter a select set of objects from a larger set. In thisproject, each account will be labeled as Filterable. That is, you must appropriately define an abstractIn java 2:54 Sprintll 23%VOLTEclass or interface representing the filterable notion. Each such filterable class must implement the methodboolean accept () which returns true or false based on the following criteria:A checking account is deemed acceptable if it is linked to an account that is acceptable.A savings account is deemed acceptable if it maintains at least the minimum amount.BankThe Bank class will act as a repository for different accounts, both savings and checking. The classshould be a simple class that:• Maintains an ArrayList of accounts,• The ability to add an account (addAccount),The ability to acquire the filtered list of accounts (getFiltered returns an ArrayList ofAccount objects). The filtered set of accounts is based on the accept method.An accessor method (size) that returns the umber of accounts stored in the Bank.TestingA complete test suite has been provided. This includes AccountTester, BankTester, and theabstract parent class, Tester.Tester - an abstract class defining several instance variables objects used by each inheriting testing class.Account Tester - a concrete class that implements all functionality required to test the four accountclasses.BankTester - a concrete class that implements all functionality required to test the Bank class.The Main class initiates the complete test suite.RequirementsThe program must meet all the requirements as tested from main via the testing classes and describedon the first page of this document.There are also a few other requirements.• The minimum amount for a savings account is $100. There is no maximum.• The minimum amount for a checking account is $0. There is no maximum for a standardchecking account, while capped checking accounts have maximum S10000.Any method that has an object as a parameter must be checked to verify the object is not null.SpecificationsFor clarity, you will implement the following methods in the corresponding classes. You may implementaccessor methods as required.ClassMethodsBankaddAccount, getFiltered, size as described above.link - given an account acct, link this account with acct.unlink - unlinks this account with acct.Account-deposits a given amount of money into the account as describedpreviously.II withdraw - withdraw a given amount of money from the account as describedpreviously.getMinimum - returns the minimum amount of money required by the particularaccount.| Checkingaccept - as described previously.link - given an account acct, link this account with acct.CappedChecking deposit - deposits a given amount of money into the account as describedpreviously.link - given an account acct, link this account with acct.RecommendationsReview the code that has been provided in the skeleton.In the corresponding Tester (AccountTester or BankTester), you may opt to commentout any of the tests in runAll while writing / testing your code.Test all account code first and perform bank tests second.

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