FileReader、FileWrite

import java.io.BufferedReader; import java.io.BufferedWriter; 
import java.io.File; 
import java.io.FileNotFoundException; 
import java.io.FileReader; 
import java.io.FileWriter; 
import java.io.IOException; 
import java.util.LinkedList; 
import java.util.List; 
public class TestIO { 
private List<String> strList= new LinkedList<String>();
//读取文件,并放入一个LinkedList中.
 public void input() { 
 try {
 BufferedReader reader = new BufferedReader(new FileReader(new File("E:\\myworks2\\MyJavaProject\\MyFolder\\helloworld")));
while(true) { 
try {
 String s = reader.readLine(); 
 if(s==null) {
break;
 } 
 strList.add(s); 
 } catch (IOException e) {
e.printStackTrace(); } } 
} catch (FileNotFoundException e) {
e.printStackTrace(); } } 
public List<String> getList() {
 return this.strList; }
 public static void main(String[] args) { 
 TestIO testIO = new TestIO(); 
testIO.input();
List<String> oList = testIO.getList(); 
//为什么减1,因为java是从零开始算的,list.size()=22 是0~21 ; 
for(int i =oList.size()-1; i>=0; i--) {
System.out.println(oList.get(i)); } 
try {
//用BufferedWriter把读出来的东西写入到另一个文件中. 
BufferedWriter writer = new
BufferedWriter(new FileWriter(new File("E:\\myworks2\\MyJavaProject\\MyFolder\\helloworld2"))); 
for(int i = 0; i <oList.size()-1; i++) {
writer.append(oList.get(i));
writer.newLine();//启一新行 }
writer.flush(); 
} catch (IOException e) { // TODO Auto-generated
catch block e.printStackTrace(); } 
}
 }