labexercises2324/week23.java

import java.util.Scanner;

class Person {
    private int age;
    private String name;

    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }

    public String toString() {
        return this.getName();
    }

}

class DemoPerson {
    public static void main(String[] args) {

        System.out.println(String.format("Would you like to meet a person?"));
        Person simon = new Person();
        simon.setAge(38);
        simon.setName("Simon");
        System.out.println(String.format("Their name is %s and their age is %d",
                                         simon.getName(), simon.getAge()));

        String newName = getUserInput("What shall we change their name to?");
        simon.setName(newName);


        System.out.println(String.format("Their name is now %s, but their age remains %d",
                                         simon, simon.getAge())); // uses toString()
    }

    /** A simple wrapper to get some user input easily
     * @param prompt What to prompt user for
     * @return User's input
     */
    public static String getUserInput(String prompt) {
        Scanner userInput = new Scanner(System.in);
        System.out.println(String.format("%s", prompt));

        if (userInput.hasNextLine()) {
            return userInput.nextLine();
        } else {
            return "";
        }
    }
}

class BankAccount {
    private String name;
    private int accountNumber;
    private double balance;

    private static int nextAccountNumber = 0;

    public BankAccount(String name) {
        this.name = name;
        this.balance = 0.0;
        this.accountNumber = nextAccountNumber;
        nextAccountNumber++;
    }

    @Override
    public String toString() {
        return "BankAccount [name=" + name + ", accountNumber=" + accountNumber + ", balance=" + balance + "]";
    }

    public int getAccountNumber() {
        return accountNumber;
    }

    public String getName() {
        return name;
    }

    public double getBalance() {
        return balance;
    }

    public void deposit (double amount) {
        this.balance += amount;
    }

    public void withdraw(double amount) {
        // No overdraft facilities here!
        if (amount <= balance) {
            this.balance -= amount;
        }
    }
}

/**
 * Exercise 2.4 & 2.6 - create two bank account objects and print their account
 * numbers, which should be 0 and 1.
 *
 * I forget the name for the implementation detail but a static member is shared across class objects / instances?
 */
class DemoBankAccount {
    public static void main(String[] args) {
        BankAccount account1 = new BankAccount("Jerry");
        BankAccount account2 = new BankAccount("Margo");

        System.out.println(String.format("%s's account number: %d", account1.getName(), account1.getAccountNumber()));
        System.out.println(String.format("%s's account number: %d", account2.getName(), account2.getAccountNumber()));

        System.out.println(String.format("Jerry will deposit £10, Margo will deposit £25"));
        account1.deposit(10.00);
        account2.deposit(25.00);
        System.out.println(String.format("Accounts:\n\t%s\n\t%s", account1, account2));

        System.out.println(String.format("Jerry goes to the pub and needs some cash for that. Margo goes to buy new garden furniture."));
        account1.withdraw(5.00);
        account2.withdraw(15.00);
        System.out.println(String.format("Accounts:\n\t%s\n\t%s", account1, account2));
    }
}