【Java 基础实例—Bank 项目1】

(上图Wie任务要求的UML结构)

Account.java 文件:

package Banking_1;

public class Account {
    private double balance;//余额  ,uml前该变量是 '-'
    public Account(double init_balance){
        balance=init_balance;
    }
    public double getBalance() {
        return balance;
    }
    //存钱
    public void deposit(double amt){
        this.balance+=amt;
    }
    //取钱
    public void withdraw(double amt){
        this.balance-=amt;
    }

}

再写一个测试类:

TestBanking.java的文件:

package Banking_1;
/*
 * This class creates the program to test the banking classes.
 * It creates a new Bank, sets the Customer (with an initial balance),
 * and performs a series of transactions with the Account object.
 */

public class TestBanking {

    public static void main(String[] args) {


        // Create an account that can has a 500.00 balance.
        System.out.println("Creating an account with a 500.00 balance.");
        Account  account=new Account(500.00);
        //code
        System.out.println("Withdraw 150.00");
        account.withdraw(150);

        System.out.println("Deposit 22.50");
        account.deposit(22.5);
        //code
        System.out.println("Withdraw 47.62");
        account.withdraw(47.62);
        //code
        // Print out the final account balance
        System.out.println("The account has a balance of " + account.getBalance());
    }
}

运行结果: