testpushbackinputstream.java

本书是一本为Java学习者在基础内容学习结束后进行课程设计时提供参考的指导书

package apibook.c3.s9;

import java.io.*;

//测试PushbackInputStream类
public class TestPushbackInputStream {
  public TestPushbackInputStream() {
  }
  public static void main(String[] args) {
    try {
      String filename = "TestPushbackInputStream.txt";
        PushbackInputStream pushin = new PushbackInputStream(
            new FileInputStream(filename));//建立流
        int num = pushin.available();//可用字节数
        System.out.println("stream available:" + pushin.available());
        for (int i=0; ; i++)
        {
          System.out.print((char)pushin.read());//读一个字符
          int ch = pushin.read();//再读一个字符
          if (ch == -1)
            break;//读到文件尾
          System.out.print((char)ch);//输出
          pushin.unread(ch);//推回一个字符
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
  }

}