[英]How can I get the implementation class name based on the interface object in Java
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 instanceof
to check the implementation object, but in my application there are nearly 20 to 30 classes implementing the same interface to override one particular method.我知道我可以使用instanceof
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。
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());
}
}
A simple getClass()
on the Object would work.对象上的简单getClass()
将起作用。
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
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