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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