Question

用JAVA编写程序，将一个文本文件中的内容，以行为单位，调整为倒序排列。提供代码，谢谢！

Answer 1

你好，代码如下，可以参考下：
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;

public class FromEndRF {

public static void read(String filename) {

RandomAccessFile rf = null;
try {
rf = new RandomAccessFile(filename, "r");
long len = rf.length();
long start = rf.getFilePointer();
long nextend = start + len - 1;
String line;
rf.seek(nextend);
int c = -1;
while (nextend > start) {
c = rf.read();
if (c == '\n' || c == '\r') {
line = rf.readLine();
if (line != null) {
System.out.println(line);
}else {
System.out.println(line);
}
nextend--;
}
nextend--;
rf.seek(nextend);
if (nextend == 0) {// 当文件指针退至文件开始处，输出第一行
System.out.println(rf.readLine());
}
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (rf != null)
rf.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}

public static void main(String args[]) {
read("d:\\demo.txt");
}
}

Answer 2

import java.io.*;
public class Sort{
public static void main(String[] args) throws IOException {
FileReader in = null;
FileWriter out = null;
BufferedReader read;
BufferedWriter write;
String temp[] = new String[100];
try {
in = new FileReader("A.txt");
out = new FileWriter("B.txt"); }
catch (FileNotFoundException e) { System.out.println("未找到文件");}
read = new BufferedReader(in);
write = new BufferedWriter(out);
String source;
int index = 0;
while((source = read.readLine()) != null){
temp[index] = source + "\n";
index++;
}
read.close();
for(int i=index-1; i>=0; i--){
write.write(temp[i]);
write.newLine();
write.flush();
}
write.close();
}

}