Question

java文本内容复制到另一个文本内

我现在已经取得了 两个文本的地址已经取得
然后需要什么知识点复制过来呢
其实算是截取
例如文本1-----2，3，4，5，6
在自己做的界面输入3个逗号
截取在文本2----得到的是4
谢谢给回答 能稍稍给加些注释吗

Answer 1

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class ReplaceText {
public static void main(String[] args ) throws Exception {
File source = new File("d:/abc.txt");
BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream(source)));

File desc = new File("d:/a.txt");
BufferedWriter out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(desc)));

String str = null;
while ((str = in.readLine()) != null) {
out.write(str + "\r\n");
}
out.close();
in.close();
}
}