[英]Array of classes implementing an interface to call same method
I have 4 classes, all implementing an interface IntSorter
. 我有4个类,都实现一个接口IntSorter
。 All classes have a sort
method, so for each class I want to call sort
on an array. 所有类都有一个sort
方法,因此对于每个类,我想在数组上调用sort
。
I thought something like this would work: 我认为这样会起作用:
IntSorter[] classes = new IntSorter[] {
Class1.class, Class2.class, Class3.class, Class4.class
};
for (Class c : classes)
c.sort(array.clone());
But classes
cannot hold the .class names, I get the error Type mismatch: cannot convert from Class<Class1> to IntSorter
但是classes
无法保存.class名称,我收到错误Type mismatch: cannot convert from Class<Class1> to IntSorter
So I tried 所以我尝试了
Class[] classes = new Class[] {
Class1.class, Class2.class, Class3.class, Class4.class
};
for (Class c : classes)
c.sort(array.clone());
But now c.sort() cannot be called. 但是现在无法调用c.sort()。 I tried parsing the class to an IntSorter first, with (IntSorter) c
but then I get the error Cannot cast from Class to IntSorter
我尝试首先使用(IntSorter) c
将类解析为IntSorter,但是随后出现错误Cannot cast from Class to IntSorter
How do I fix this? 我该如何解决?
Use the first approach, but you want for (IntSorter c : classes)
- and you need to put instances in your array (not the classes). 使用第一种方法,但是要for (IntSorter c : classes)
-并且需要将实例放入数组(而不是类)中。 Something like, 就像是,
IntSorter[] classes = new IntSorter[] {
new Class1(), new Class2(), new Class3(), new Class4()
};
for (IntSorter c : classes) {
c.sort(array.clone());
}
You are attempting to create array of classes instead of array of instances of classes implementing IntSorter
. 您正在尝试创建类数组而不是实现IntSorter
的类实例数组。
Check this question to understand difference between Classes, Objects and Instances: The difference between Classes, Objects, and Instances 检查此问题以了解类,对象和实例之间的区别 :类,对象和实例之间的区别
Your code should look something like this, as far as I can tell with limited information available: 就我所提供的有限信息而言,您的代码应该看起来像这样:
IntSorter[] classes = new IntSorter[] {
new Class1(), new Class2(), new Class3(), new Class4()
};
for (IntSorter c : classes)
c.sort(array.clone());
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