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abstractMethod [
self subclassResponsibility
]
现在，当有人向您的类发送消息时，他会得到一个错误，指出应该实现此方法，并且您必须在子类中重写它。
是。子类可以访问所有实例变量。
好的，因此关键字消息之类的withdraw: amount实际上可以具有多个参数，例如：withdraw: amount becauSEOf: reason。因此，首先要进行初始化：
initWithBalance: aBalance customer: aCustomer number: anumber [
self init.
balance := aBalance.
customer := aCustomer.
number := anumber
]
您可以保持interest := 0.@H_7_6@main init。然后，为了使您的生活更好，您可以进行参数设置new并init从那里调用参数设置。
SavingsAccount class [
newWithBalance: aBalance customer: aCustomer number: anumber [
^ self new initWithBalance: aBalance customer: aCustomer number: anumber
]
]
假设我正在尝试将以下Java类转换为GNU smalltalk：
public abstract class Account {
protected String number;
protected Customer customer;
protected double balance;
public abstract void accrue(double ratE);
public double balance() {
return balance;
}
public void deposit(double amount) {
balance += amount;
}
public void withdraw(double amount) {
balance -= amount;
}
public String toString() {
return number + ":" + customer + ":" + balance;
}
}
public class SavingsAccount extends Account {
private doublE interest = 0;
public SavingsAccount(String number,Customer customer,double balancE) {
this.number = number;
this.customer = customer;
this.balance = balance;
}
public void accrue(double ratE) {
balance += balance * rate;
interest += interest * rate;
}
}
我正在努力了解如何编写带有多个参数的方法/构造函数。到目前为止，这是我得到的：
Object subclass: Account [
|number customer balance|
balance [
^balance
]
deposit: amount [
balance := balance + amount
]
withdraw: amount [
balance := balance - amount
]
asString [
^number asString,':',customer asString,balance asString
]
]
Account subclass: SavingsAccount [
|interest|
SavingsAccount class [
new [ "add some sort of support for multiple arguments?"
"call init"
]
]
init [ "add some sort of support for multiple arguments?"
interest := 0.
balance := accountBalance.
customer := accountCustomer.
number := accountnumber
]
accrue: rate [
balance := balance + (balance * ratE).
interest := interest + (interest * ratE)
]
]
几个问题：
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