package onlyfun.caterpillar;

import java.io.*;

public class PushbackStreamDemo {

public static void main(String[] args) {

try {

PushbackInputStream pushbackInputStream =

new PushbackInputStream(

new FileInputStream(args[0]));

byte[] array = new byte[2];

int tmp = 0;

int count = 0;

while((count = pushbackInputStream.read(array))

!= -1) {

// 兩個位元組轉換為整數

tmp = (short)((array[0] << 8) |

(array[1] & 0xff));

tmp = tmp & 0xFFFF;

// 判斷是否為BIG5，如果是則顯示BIG5中文字

if(tmp >= 0xA440 && tmp < 0xFFFF) {

System.out.println("BIG5: " +

new String(array));

}

else {

// 將第二個位元組推回串流

pushbackInputStream.unread(array, 1, 1);

// 顯示ASCII範圍的字元

System.out.println("ASCII: " +

(char)array[0]);

}

}

pushbackInputStream.close();

}

catch(ArrayIndexOutOfBoundsException e) {

System.out.println("請指定檔案名稱");

}

catch(IOException e) {

e.printStackTrace();

}

}

}