题解 | #定义打印方法#

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();
        // print就是需要你定义的方法
        print(Class.forName(className).newInstance());
    }
}

public static void print(Object obj) {
    System.out.print(obj.toString());
}

}

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

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

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