📄 copyfileaddlinenumber2.java
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import java.io.*;
import java.awt.*;
import java.text.*;
public class CopyFileAddLineNumber2 {
public static void main (String[] args) {
//FileDialog fd=new FileDialog(new Frame(),"文件对话框",FileDialog.LOAD);
//fd.setVisible(true);
//String fpath=fd.getDirectory();
//String fname=fd.getFile();
//String si=fpath+fname;
//File file = new File(si);
String infname = "CopyFileAddLineNumber.java";
String outfname = "CopyFileAddLineNumber.txt";
if( args.length >= 1 ) infname = args[0];
if( args.length >= 2 ) outfname = args[1];
try {
File fin = new File(infname);
File fout = new File(outfname);
LineNumberReader in = new LineNumberReader(new FileReader(fin));
PrintWriter out = new PrintWriter(new FileWriter(fout));
DecimalFormat fmt = new DecimalFormat("00");
int cnt = 0; // 行号
String s = in.readLine();
while ( s != null ) {
//cnt ++;
cnt = in.getLineNumber();
//s = deleteComments(s); //去掉以//开始的注释
out.println( fmt.format(cnt) + ": " + s ); //写出
s = in.readLine(); //读入
}
in.close(); // 关闭缓冲读入流及文件读入流的连接.
out.close();
} catch (FileNotFoundException e1) {
System.err.println("File not found!" );
} catch (IOException e2) {
e2.printStackTrace();
}
}
static String deleteComments( String s ) //去掉以//开始的注释
{
if( s==null ) return s;
int pos = s.indexOf( "//" );
if( pos<0 ) return s;
return s.substring( 0, pos );
}
}
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