java 回退流

 1 import java.io.ByteArrayInputStream;
 2 import java.io.IOException;
 3 import java.io.PushbackInputStream;
 4 
 5 
 6 public class PushInputStreamDemo {
 7     public static void main(String[] args) throws Exception {
 8         String str="www.hjw.com";
 9         ByteArrayInputStream bai=new ByteArrayInputStream(str.getBytes());
10         PushbackInputStream push=new PushbackInputStream(bai);
11         System.out.println("读取后的数据为：");
12         int temp=0;
13         while((temp=push.read())!=-1){
14             if(temp=='.'){
15                 push.unread(temp);
16                 temp=push.read();
17                 System.out.print("（退回"+(char)temp+")");//为了显示内容，打印出来
18             }else{
19                 System.out.print((char)temp);
20             }
21         }
22     }
23 }