import java.io.*;
public class Iotest
{
public void readText(int line_l)throws IOException
{
FileReader input = new FileReader(new File("w://haifei.txt"));
BufferedReader inputLine = new BufferedReader(input); FileWriter output = new FileWriter(new File("w://haixiang.txt"));
BufferedWriter outputLine = new BufferedWriter(output);
String line = inputLine.readLine(); String s = ""; int m = 0; if (m == line_l)
{
s = line;
System.out.println(s);
}
while (line != null)
{
outputLine.write(line,0,line.length()); outputLine.newLine(); line = inputLine.readLine(); }
inputLine.close();
outputLine.close(); } public static void main(String[] args)throws IOException
{
Iotest io = new Iotest();
io.readText(4); }
}"haifei.txt"中的数据如下
1-->JAVA基础
2--->面向对象原理
3--->数组
4--->继承
5--->多台
.
.
.
10-->IO流
读第四行
程序输出 4--->继承高手请看看怎么我写的什么也不输出呀..
public class Iotest
{
public void readText(int line_l)throws IOException
{
FileReader input = new FileReader(new File("w://haifei.txt"));
BufferedReader inputLine = new BufferedReader(input); FileWriter output = new FileWriter(new File("w://haixiang.txt"));
BufferedWriter outputLine = new BufferedWriter(output);
String line = inputLine.readLine(); String s = ""; int m = 0; if (m == line_l)
{
s = line;
System.out.println(s);
}
while (line != null)
{
outputLine.write(line,0,line.length()); outputLine.newLine(); line = inputLine.readLine(); }
inputLine.close();
outputLine.close(); } public static void main(String[] args)throws IOException
{
Iotest io = new Iotest();
io.readText(4); }
}"haifei.txt"中的数据如下
1-->JAVA基础
2--->面向对象原理
3--->数组
4--->继承
5--->多台
.
.
.
10-->IO流
读第四行
程序输出 4--->继承高手请看看怎么我写的什么也不输出呀..
public class Iotest
{
public void readText(int line_l)throws IOException
{
FileReader input = new FileReader(new File("w://haifei.txt"));
BufferedReader inputLine = new BufferedReader(input); String line = inputLine.readLine(); String s = ""; int m = 1; while (line != null)
{
if (m == line_l)
{
s = line;
System.out.println(s);
break;
}
line = inputLine.readLine();
m++; }
inputLine.close(); } public static void main(String[] args)throws IOException
{
Iotest io = new Iotest();
io.readText(4); }
}
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;public class Iotest
{ public void readText(int line_l) throws IOException
{ FileReader input = new FileReader(new File("w://haifei.txt"));
BufferedReader inputLine = new BufferedReader(input);
String line; int count = 0;
while ((line = inputLine.readLine()) != null) {
count++;
if (count == line_l) {
System.out.println(line);
}
} inputLine.close();
} public static void main(String[] args) throws IOException
{
Iotest io = new Iotest();
io.readText(4);
}
}