字符缓冲流、案例：复制Java文件（字符缓冲流）

一、字符缓冲流

public class BufferedReader extends Reader
public class BufferedWriter extends Writer

构造函数：

BufferedReader(Reader in)
BufferedWriter(Writer out)

写数据：

FileWriter fw = new FileWriter("sdfsf\\sfs.java");
BufferedWriter bw = new BufferedWriter(bw);
两行简化为一行：
BufferedWriter bw = new BufferedWriter(new FileWriter("sdfsf\\sfs.java"));
bw.write("hello\r\n");
bw.writer("world\r\n");

读数据：一次读一个字符数据

BufferedReader br = new BufferedReader(new FileReader("sdfsf\\sfs.java"));
int ch;
while((ch = br.read())!=-1){
    sout((char)ch);
}
br.close();

读数据：一次读一个字符数组数据

BufferedReader br = new BufferedReader(new FileReader("sdfsf\\sfs.java"));
char[] chs = new char[1024];
int len;
while((len = br.read(chs))!=-1){
    sout(new String(chs,0,len));
}
br.close();

二、案例：

操作：
一次读写一个字符数据

一次读写一个字符数组数据