谁帮我给这段java程序加上(详细)的注释,有点看不明白!

[白日梦83]

package test;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class CopyFile {

public boolean copyFile(String src,String des)
{
File srcFile = new File(src);

File desFile = new File(des);

try {
FileInputStream fis = new FileInputStream(srcFile);

FileOutputStream fos = new FileOutputStream(desFile);

int bytesRead;

byte[] buf = new byte[4*1024];

while((bytesRead=fis.read(buf))!=-1)
{
fos.write(buf,0,bytesRead);
}
fos.flush();
fos.close();
fis.close();
} catch (FileNotFoundException e) {

e.printStackTrace();
} catch (IOException e) {

e.printStackTrace();
}

return true;
}
public static void main(String[] args) {

CopyFile cf = new CopyFile();

String src = args[0];

String des = args[1];

if(cf.copyFile(src, des))
{
System.out.println("拷贝成功!");
}else
{
System.out.println("拷贝失败!");
}

}

}

[justinavril]

package test;

//导入java包
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class CopyFile {

public boolean copyFile(String src,String des)
{
File srcFile = new File(src);

File desFile = new File(des); // 创建两个文件，第一个是原文件，第二个是目标文件

try {
FileInputStream fis = new FileInputStream(srcFile);

FileOutputStream fos = new FileOutputStream(desFile); //输入输出流

int bytesRead;

byte[] buf = new byte[4*1024];

while((bytesRead=fis.read(buf))!=-1)
{
fos.write(buf,0,bytesRead);//将流写出
}
fos.flush();
fos.close();
fis.close();
} catch (FileNotFoundException e) {

e.printStackTrace();
} catch (IOException e) {

e.printStackTrace();
}

return true;
}
public static void main(String[] args) {

CopyFile cf = new CopyFile();

String src = args[0];

String des = args[1];

if(cf.copyFile(src, des)) //复制是否成功
{
System.out.println("拷贝成功!");
}else
{
System.out.println("拷贝失败!");
}

}

}