问答题

编程实现，利用文件读写类实例化文件输入输出流。通过键盘输入一个英文小写字符串，将其写入到文件file1.txt中，然后将所输入的字符串转换为大写字母，追加到file1.txt后面，最后将file1.txt中的全部内容，写入到一个新文件file2.txt中。

【参考答案】

import java.io.*;
import java.util.Scanner;
public......

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