testpushbackreader.java

来自「一个很好的Java函数实例」· Java 代码 · 共 38 行

package apibook.c3.s9;

import java.io.*;

//测试PushbackReader类
public class TestPushbackReader {
  public TestPushbackReader() {
  }
  public static void main(String[] args) {
    try {
      String filename = "TestPushbackReader.txt";
        PushbackReader in = new PushbackReader(new FileReader(filename),1024);
        boolean eof = true;
        while (eof) {
          StringBuffer strbuf = new StringBuffer();//字符缓冲
          while (true)
          {
            strbuf.append((char)in.read());
            int ch = in.read();//读入一个字节
            if (ch == -1)
            {//是否文件尾
              eof = false;break;
            }
            if (Character.isWhitespace((char)ch))
              break;//是否空格，是则是新单词
            if (Character.isLetterOrDigit((char)ch))
              strbuf.append((char)ch);//是否是合法字母，是则加入缓冲
            in.unread(ch);
          }
          System.out.println("word:" + new String(strbuf));//输出该单词
        }

        in.close();//关闭文件
    } catch (IOException e) {
        System.err.println(e);
    }
  }
}