php 无法将类 Dollar 的对象转换为 int
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Object of class Dollar could not be converted to int
提问by Debashis
I was going through the book named "Test-Driven Development By Example" By the author Kent Beck.
我正在阅读作者 Kent Beck 写的名为“Test-Driven Development By Example”的书。
I am trying to write a similar function in php but not understanding the steps.
我正在尝试在 php 中编写一个类似的函数，但不了解步骤。
Original function:
原函数：
Test function:
测试功能：
public void testEquality() {
assertTrue(new Dollar(5).equals(new Dollar(5)));
assertFalse(new Dollar(5).equals(new Dollar(6)));
}
Class function:
类功能：
public boolean equals(Object object) {
Dollar dollar = (Dollar) object;
return amount == dollar.amount;
}
My code:
我的代码：
Test function:
测试功能：
public function setup() {
$this->dollarFive = new Dollar(5);
}
public function testEquality() {
$this->assertTrue($this->dollarFive->equals(new Dollar(5)));
}
Class Function:
类功能：
class Dollar
{
public function __construct($amount) {
$this->amount = (int) $amount;
}
public function equals(Dollar $object) {
$this->Object = $object;
return $this->amount == $this->Object;
}
}
While executing the test case i am getting the following error.
在执行测试用例时，我收到以下错误。
Object of class Dollar could not be converted to int
无法将类 Dollar 的对象转换为 int
Need some help on this. How can i fix this?
需要一些帮助。我怎样才能解决这个问题？
回答by KingCrunch
return $this->amount == $this->Object;
$this->amountis an int, $this->Objectisn't an int. You tried to compare each other, thus you'll get
$this->amount是一个int，$this->Object不是一个int。你试图相互比较，因此你会得到
Object of class Dollar could not be converted to int
无法将类 Dollar 的对象转换为 int
You probably mean
你可能是说
return $this->amount == $this->Object->amount;
However, there is also something curious in your class
然而，你的课堂上也有一些奇怪的东西
class Dollar {
public $amount = 0; // <-- forgotten
public function __construct($amount) {
$this->amount = (int) $amount;
}
public function equals(Dollar $object) {
$this->Object = $object; // <--- ?!?
return $this->amount == $this->Object;
}
}
you'll probably want just
你可能只想要
public function equals(Dollar $object) {
return $this->amount == $object->amount;
}
