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(); } } }