PushbackInputStream

PushbackInputStream

- 데이터의 읽기복구(unread)기능을 제공

-> 방금 읽은 바이트를 읽기 전의 바이트 입력 스트림으로 되돌리기가 가능

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import java.io.ByteArrayInputStream;

import java.io.IOException;

import java.io.PushbackInputStream;

public class PushbackInputStreamTest {

public static void main(String[] args) throws IOException{

String s = "Java.";

System.out.println(s);

byte[] buffer = s.getBytes();

ByteArrayInputStream in = new ByteArrayInputStream(buffer);

PushbackInputStream f = new PushbackInputStream(in);

int c;

int count = 0;

while( (c = f.read()) != -1){

count++;

switch (c) {

case 'a':

if( (c = f.read()) == 'v'){

System.out.print("o");

// System.out.println("o" + "/ count : " + count + "/ c : " + c + "/ v == true");

}else{

System.out.print("b");

// System.out.println("b" + "/ count : " + count + "/ c : " + c + "/ v == false");

f.unread(c);

}

break;

default:

System.out.print( (char)c);

// System.out.println( (char)c + "/ count : " + count + "/ c : " + c + "/ default");

break;

}

}

}

}