题解 | 类型判断

import java.util.Scanner;

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) {
        //write your code here......
        return obj.getClassName();
    }

}

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

class Sub1 extends Base {
    @Override
    public String getClassName(){
        return "Sub1";
    }   
}

class Sub2 extends Base {
    @Override
    public String getClassName(){
        return "Sub2";
    }
}