Comparable Programming. Suppose you have a pre-existing class called BankAccount that represents users' accounts and money deposited at a given bank. The class has the following data and behavior:

Field/Constructor/Method	Description
private String name	name of the person using the account
private int id	ID number of this account
private double balance	amount of money currently in the account
public BankAccount(String name, int id)	makes account with given name/ID and $0.00
public void deposit(double amount)	adds given amount to account's balance
public int getID()	returns the account's ID number
public String getName()	returns the account's name
public double getBalance()	returns the account's balance
public String toString()	returns String such as "Ed Smith: $12.56"
public void withdraw(double amount)	subtracts given amount from account's balance

Make BankAccount objects comparable to each other using the Comparable interface.

use the following rules to implement the compareTo method

• The bank wants to sort by who has the most money, so accounts are compared by balance.
• One with a lower balance is considered to be "less than" one with a higher balance.
• If two accounts have the same balance, they are compared by ID.
• The one with the lower ID is considered to be "less than" the one with the higher ID.
• If two accounts have the same balance and ID, they are considered to be "equal." Your method should not modify any account's state. You may assume the parameter passed is not null.

solution

public class BankAccount implements Comparable {

 public int compareTo(Object o) { BankAccount other = (BankAccount)o; if (balance > other.getBalance()) { return 1; } else if (balance < other.getBalance()) { return -1; } else if (id > other.getID()) { return 1; } else if (id < other.getID()) { return -1; } else { return 0; } } }