11月22日java练习：对象和类（根据UML示意图编写程序）

 UML示意图：最上方Account为类

中部（声明属性）：-（表示访问权限域为private）id（属性名）：double（数据类型）

下部（定义方法）：+（表示访问权限域为public）Account（方法名）（int，double，double）（接收的参数）

1.创建account类：

{
    private int id;
    private double balance;
    private double annualInterestRate;
    private Date dateCreated;

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

    dateCreated = new Date();
    }

    public boolean withDraw(double amount){
        if(balance<amount)
            return false;
        balance-=amount;
        return true;
    }
    public void deposite(double amount){
        balance+=amount;
    }

    public int getId() {
        return id;
    }

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

    public double getBalance() {
        return balance;
    }

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

    public double getAnnualInterestRate() {
        return annualInterestRate;
    }

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

    public Date getDateCreated() {
        return dateCreated;
    }

    public void setDateCreated(Date dateCreated) {
        this.dateCreated = dateCreated;
    }
}

2.生成一个对象：

{
    public static void main(String[] args){
        Account testAccount = new Account(11112,20000,4);
        if(testAccount.withDraw(200000))
            System.out.println("withdraw successful");
        else
            System.out.println("withdraw not successful");
        testAccount.deposite(30000);
        System.out.println("id:"+testAccount.getId()+" "+
                "balance:"+testAccount.getBalance()+" "+
                "annualInterestRate:"+testAccount.getAnnualInterestRate());
    }
}

运行结果：

withdraw not successful
id:11112 balance:50000.0 annualInterestRate:4.0