package onlyfun.caterpillar;
import java.io.*;
public class PushbackReaderDemo {
public static void main(String[] args) {
char[] symbols = {'<', '>',
'≦', '≧',
'≠', '='};
try {
PushbackReader pushbackReader =
new PushbackReader(
new FileReader(args[0]));
FileWriter fileWriter =
new FileWriter("math_"+ args[0]);
int c = 0;
while((c = pushbackReader.read()) != -1) {
int poss = -1;
switch(c) {
case '<':
poss = 0; break;
case '>':
poss = 1; break;
case '!':
poss = 2; break;
case '=':
poss = 5; break;
default:
fileWriter.write(c);
}
if(poss != -1) {
if((c = pushbackReader.read()) == '=') {
fileWriter.write(symbols[poss + 2]);
fileWriter.write(' ');
}
else {
pushbackReader.unread(c);
fileWriter.write(symbols[poss]);
}
}
}
pushbackReader.close();
fileWriter.close();
}
catch(ArrayIndexOutOfBoundsException e) {
System.out.println("請指定檔案");
}
catch(IOException e) {
e.printStackTrace();
}
}
}