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Aggiunti esercizi pagine 516-525

This commit is contained in:
Giacomo R. 2023-05-15 18:38:39 +02:00
parent 50f648d037
commit f7c307a294
3 changed files with 113 additions and 0 deletions
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28
NetBeans Projects/Grafica/src/investment/BankAccount.java Normal file
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package investment;
public class BankAccount {
private double balance;
public BankAccount() {
balance = 0;
}
public BankAccount(double initialBalance) {
balance = initialBalance;
}
public void deposit(double amount) {
double newBalance = balance + amount;
balance = newBalance;
}
public void withdraw(double amount) {
double newBalance = balance - amount;
balance = newBalance;
}
public double getBalance() {
return balance;
}
}

39
NetBeans Projects/Grafica/src/investment/InvestmentViewer1.java Normal file
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package investment;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
public class InvestmentViewer1 {
private static final int FRAME_WIDTH = 120;
private static final int FRAME_HEIGHT = 60;
private static final double INTEREST_RATE = 10;
private static final double INITIAL_BALANCE = 1000;
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setSize(FRAME_WIDTH, FRAME_HEIGHT);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
BankAccount account = new BankAccount(INITIAL_BALANCE);
JButton button = new JButton("Aggiungi interessi");
frame.add(button);
class InterestListener implements ActionListener {
public void actionPerformed(ActionEvent event) {
double interest = account.getBalance() * INTEREST_RATE / 100;
account.deposit(interest);
System.out.println("saldo: " + account.getBalance());
}
}
ActionListener listener = new InterestListener();
button.addActionListener(listener);
frame.setVisible(true);
}
}

46
NetBeans Projects/Grafica/src/investment/InvestmentViewer2.java Normal file
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package investment;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class InvestmentViewer2 {
private static final int FRAME_WIDTH = 400;
private static final int FRAME_HEIGHT = 100;
private static final double INTEREST_RATE = 10;
private static final double INITIAL_BALANCE = 1000;
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setSize(FRAME_WIDTH, FRAME_HEIGHT);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
BankAccount account = new BankAccount(INITIAL_BALANCE);
JButton button = new JButton("Aggiungi interessi");
JLabel label = new JLabel("Saldo: " + account.getBalance());
JPanel panel = new JPanel();
panel.add(button);
panel.add(label);
frame.add(panel);
class InterestListener implements ActionListener {
public void actionPerformed(ActionEvent event) {
double interest = account.getBalance() * INTEREST_RATE / 100;
account.deposit(interest);
label.setText("Saldo: " + account.getBalance());
}
}
ActionListener listener = new InterestListener();
button.addActionListener(listener);
frame.setVisible(true);
}
}