学步园

import java.io.*;<br /> import java.util.Scanner;</p> <p>public class Expression {</p> <p> /**<br /> * @param args<br /> * @throws IOException<br /> */<br /> public static void main(String[] args) throws IOException {<br /> // TODO Auto-generated method stub<br /> File fileSource = new File("e://debug.txt");<br /> File fileTarget = new File("e://debug2.txt");<br /> BufferedReader br = new BufferedReader(new FileReader(fileSource));<br /> BufferedWriter bw = new BufferedWriter(new FileWriter(fileTarget));</p> <p> Scanner in = new Scanner(br);<br /> while(in.hasNext())<br /> {<br /> String str = in.nextLine();<br /> StringBuffer sb = new StringBuffer(str);<br /> int i, j;</p> <p> if((i = sb.indexOf("/*")) != -1 && (j = sb.indexOf("*/")) != -1)<br /> sb.delete(i, j+2);</p> <p> else if(i != -1)<br /> {<br /> sb.delete(i, sb.length());<br /> bw.write(sb.toString());<br /> bw.write("/r/n");<br /> bw.flush();</p> <p> do<br /> {<br /> if(in.hasNext())<br /> {<br /> str = in.nextLine();<br /> sb = new StringBuffer(str);<br /> }<br /> else<br /> sb = null;<br /> }while((i = sb.indexOf("*/")) == -1);<br /> if(in.hasNext())<br /> {<br /> str = in.nextLine();<br /> sb = new StringBuffer(str);<br /> }<br /> else<br /> sb = null;<br /> }</p> <p> if((i = sb.indexOf("//")) != -1)<br /> sb.delete(i, sb.length());<br /> if(sb != null)<br /> {<br /> if((i = sb.indexOf("/*")) != -1 && (j = sb.indexOf("*/")) != -1)<br /> sb.delete(i, j+2);<br /> bw.write(sb.toString());<br /> bw.write("/r/n");<br /> bw.flush();<br /> }<br /> }<br /> br.close();<br /> bw.close();<br /> }</p> <p>}<br />