如何根据Java中的接口对象获取实现类名
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How can I get the implementation class name based on the interface object in Java
提问by Veera
I want to get the implementation class name from my interface object — is there any way to do this?
我想从我的接口对象中获取实现类名称——有什么办法可以做到这一点吗？
I know I can use instanceofto check the implementation object, but in my application there are nearly 20 to 30 classes implementing the same interface to override one particular method.
我知道我可以instanceof用来检查实现对象，但是在我的应用程序中，有将近 20 到 30 个类实现了相同的接口来覆盖一个特定的方法。
I want to figure out which particular method it is going to call.
我想弄清楚它将调用哪个特定方法。
采纳答案by Manuel
Just use object.getClass()- it will return the runtime class used implementing your interface:
只需使用object.getClass()- 它将返回用于实现您的接口的运行时类：
public class Test {
public interface MyInterface { }
static class AClass implements MyInterface { }
public static void main(String[] args) {
MyInterface object = new AClass();
System.out.println(object.getClass());
}
}
回答by TheLostMind
A simple getClass()on the Object would work.
一个简单getClass()的对象就可以了。
example :
例子 ：
public class SquaresProblem implements MyInterface {
public static void main(String[] args) {
MyInterface myi = new SquaresProblem();
System.out.println(myi.getClass()); // use getClass().getName() to get just the name
SomeOtherClass.printPassedClassname(myi);
}
@Override
public void someMethod() {
System.out.println("in SquaresProblem");
}
}
}
interface MyInterface {
public void someMethod();
}
class SomeOtherClass {
public static void printPassedClassname(MyInterface myi) {
System.out.println("SomeOtherClass : ");
System.out.println(myi.getClass()); // use getClass().getName() to get just the name
}
}
O/P :
开/关：
class SquaresProblem --> class name
SomeOtherClass :
class SquaresProblem --> class name
