exercise6_3.java

Introduction to java programming 一书中所有编程练习部分的源码

// Exercise6_3.java: Create the Account class
public class Exercise6_3 {
  public static void main (String[] args) {
    Account1 account = new Account1(1122, 20000, 0.045);

    account.withdraw(2500);
    account.deposit(3000);
    System.out.println("Balance is " + account.getBalance());
    System.out.println("Monthly interest is " +
      account.getMonthlyInterest());
  }
}

class Account1 {
  private int id;
  private double balance;
  private double annualInterestRate;

  public Account1() {
  }

  public Account1(int id, double balance, double annualInterestRate) {
    this.id = id;
    this.balance = balance;
    this.annualInterestRate = annualInterestRate;
  }

  public int getId() {
    return this.id;
  }

  public double getBalance() {
    return balance;
  }

  public double getAnnualInterestRate() {
    return annualInterestRate;
  }

  public void setId(int id) {
    this.id =id;
  }

  public void setBalance(double balance) {
    this.balance = balance;
  }

  public void setAnnualInterestRate(double annualInterestRate) {
    this.annualInterestRate = annualInterestRate;
  }

  public double getMonthlyInterest() {
    return balance * (annualInterestRate / 12);
  }

  public void withdraw(double amount) {
    balance -= amount;
  }

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