题解 | #类型判断#

import java.util.Scanner;

@SuppressWarnings("deprecation")
public class Main {

    public static void main(String[] args) throws Exception {
        Scanner scanner = new Scanner(System.in);
        while (scanner.hasNext()) {
            String className = scanner.next();
            Base obj = (Base) Class.forName(className).newInstance();
            System.out.println(getClassName(obj));
        }
    }
    public static String getClassName(Base obj) {
       return obj.toString();
    }

}

class Base {
    public String toString(){
        return "Base";
    }
}

class Sub1 extends Base {
    public String toString(){
        return "Sub1";
    }
}

class Sub2 extends Base {
    public String toString(){
        return "Sub2";
    }
}