自定义BufferedReader的两个方法

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展示read(),和readLine()方法

public class MyBufferedReader {private FileReader f;// 定义一个数组作为缓冲区private char[] buf = new char[1024];// 定义一个指针用来操作数组中的元素，当操作到最后一个元素后指针归零private int pos = 0;// 定义一个计数器用来计算缓冲区中的数据个数，当为0时，继续取数据到缓冲区中private int count = 0;MyBufferedReader(FileReader f) {this.f = f;}/** * 缓冲区中读 * @return * @throws IOException */public int myRead() throws IOException {// 源中取数据到缓冲区中,计数器为0才取if(count==0){count = f.read(buf);pos = 0;}if(count==-1){return -1;}char ch = buf[pos];pos++;count--;return ch;/*if (count == 0) {count = f.read(buf);if (count == -1)return -1;//获取数据到缓冲区后指针归0pos = 0;char ch = buf[pos];pos++;count--;return ch;} else if (count > 0) {char ch = buf[pos];pos++;count--;return ch;}*/}public String myReadLine() throws IOException {//当一个缓冲区StringBuilder sb = new StringBuilder();int ch = 0;while((ch = myRead())!=-1){if(ch == '\r'){continue;}if(ch=='\n'){return sb.toString();}sb.append((char)ch);}//最后一行后面没符号，也成功if(sb.length()!=0)return sb.toString();return null;}public void close() throws IOException {f.close();}}

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