高效IO流

 BufferedReader:高效的字符输入流（读效率高）
* BufferedWriter:高效的字符输出流（写效率高）
*构造：
*BufferedWriter(Writer out) 
* 
* 
*/
// 高效的字符输出流
// Writer w=new FileWriter("D://流1//bf.txt");
// BufferedWriter bufferedWriter = new BufferedWriter(w);//创建高效字符输出流对象
// bufferedWriter.write("wewerw");
// bufferedWriter.flush();
// bufferedWriter.close();

// 高效的字符输入流
// FileReader fileReader = new FileReader("D://流1//Person.java");
// BufferedReader bufferedReader = new BufferedReader(fileReader);
//// int len=0;
//// while ((len=bufferedReader.read())!=-1) {
//// System.out.print((char)len);
//// }
// char[] ch=new char[1024];
// int len=0;
// while ((len=bufferedReader.read(ch))!=-1) {
// System.out.print(new String(ch,0,len));
// }


// 复制
//// 创建输入输出流对象
// BufferedReader bufferedReader = new BufferedReader(new FileReader("D://流1//Person.java"));
// BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter("C://高效.java"));
//// 读一次写一次
// char[] ch=new char[1024*2];
// int len=0;
// while ((len=bufferedReader.read(ch))!=-1) {
// bufferedWriter.write(ch, 0, len);
// bufferedWriter.flush();
// }
//// bufferedWriter.flush();
// bufferedReader.close();
// bufferedWriter.close();

// 复制
BufferedReader bufferedReader = new BufferedReader(new FileReader("D://流1//Person.java"));
BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter("C://line.java"));
String s;
while ((s=bufferedReader.readLine())!=null) {
bufferedWriter.write(s);
bufferedWriter.newLine();
}
bufferedWriter.close();
}
}