數據結構與算法1

 第一個代碼，描述一個被稱爲BankAccount的類，該類模擬了銀行中的帳戶操做。程序創建了一個開戶金額，顯示金額，存款，取款並顯示餘額。

主要的知識點聯繫爲類的含義，構造函數，公有和私有。

class BankAccount {
private double balance;
public BankAccount(double openingBalance)
	{
	balance = openingBalance;
	}
public void deposit(double amount)
	{
	balance = balance + amount;
	}
public void withdraw(double amount)
	{
	balance = balance - amount;
	}
public void display()
	{
	System.out.println("balance=" + balance);
	}
}

class BankApp
{
public static void main(String[] args)
	{
	BankAccount ba1 = new BankAccount(100.00);
	System.out.println("Before transactions,");
	ba1.display();
	ba1.deposit(74.14);
	ba1.withdraw(20.00);
	System.out.println("After transactions");
	ba1.display();
	}
}

Before transactions,
balance=100.0
After transactions
balance=154.14