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......
    /*instanceof关键字的使用，它是多态性中父类引用向下转型的前置判断手段.
    	有效控制了类的转换异常ClassCastException的出现*/
    if(obj instanceof Sub1){
        return "Sub1";
    }else if(obj instanceof Sub2){
        return "Sub2";
    }else{
        return "Base";
    }

}

}

class Base { //父类

}

class Sub1 extends Base { //子类1

}

class Sub2 extends Base { //子类2

}