文件名称:1
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设计一合并文本文件程序，可按以下步骤实现：
l 创建一窗口框架；
l 输入三个文本文件名；
l 分别打开前面两个文件，将其内容合并到第三个文件上，也就是file3 = file1 + file2。
l 然后再将file3的内容显示在窗口上。
-Design a text file merge program, according to the following steps to achieve: l Create a window fr a me l three text input file name l, respectively, in front of the two files open, its contents into a third file, which is file3 = file1+ file2. l file3 then the content is displayed in the window.
l 创建一窗口框架；
l 输入三个文本文件名；
l 分别打开前面两个文件，将其内容合并到第三个文件上，也就是file3 = file1 + file2。
l 然后再将file3的内容显示在窗口上。
-Design a text file merge program, according to the following steps to achieve: l Create a window fr a me l three text input file name l, respectively, in front of the two files open, its contents into a third file, which is file3 = file1+ file2. l file3 then the content is displayed in the window.
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1.txt