filereader流和filewriter流以及bufferreader和bufferwriter流

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public class MyfileRW {

 public static void main(String[] args) throws IOException{

//filereader和filewriter流

FileReader fileReader=new FileReader("lzs.txt");
FileWriter fileWriter=new FileWriter("333.txt");//filereader和filewriter流用的时间79
 //buffer流
BufferedReader bufferedReader=new BufferedReader(fileReader);//filereader和filewriter流用的时间16
BufferedWriter bufferedWriter=new BufferedWriter(fileWriter);
 
int i=0;
long a=System.currentTimeMillis();//当前时间
while((i=bufferedReader.read())!=-1){
bufferedWriter.write(i);
}
long b=System.currentTimeMillis();//结束时间
fileReader.close();
fileWriter.close();
 
System.out.print(b-a);
 }