Question

实现文件的建立和读写操作

实现文件的建立和读写操作。首先建立文件File1和File2，然后从键盘输入，并将输入的内容写入File1中，然后将File1中的内容以倒序写入File2中，最后将File2的内容显示。

Answer 1

貌似倒序后换行不见了...

import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;

public class Test
{
public static void main(String[] args) throws IOException
{
File file1 = new File("D:/f1.txt");
File file2 = new File("D:/f2.txt");

int c;
InputStream input1 = System.in;
InputStreamReader reader1 = new InputStreamReader(input1);
FileWriter writer1 = new FileWriter(file1);

while ((c = reader1.read()) != -1) {
writer1.write(c);
}
writer1.close();

FileReader reader2 = new FileReader(file1);
FileWriter writer2 = new FileWriter(file2);
ArrayList<Integer> list = new ArrayList<Integer>();

while ((c = reader2.read()) != -1) {
list.add(c);
}

for (int i = list.size() - 1; i >= 0; --i) {
writer2.write(list.get(i));
}
writer2.close();
}
}