Counting Line

example.java

-   // This file contains 3 lines of code
1   public interface Dave {
-     /**
-      * count the number of lines in a file
-      */
2     int countLines(File inFile); // not the real signature!
3   }

reg.java

public class LineCounter {

    public int count(String code) {
        code = code.replaceAll("\r\n", "\n");
        code = code.replaceAll("(?s)/\\*.*?\n.*?\\*/", "\n");
        code = code.replaceAll("(?s)/\\*.*?\\*/", "");
        code = code.replaceAll("(?s)\n+", "\n");
        code = code.trim();
        return code.equals("") ? 0 : code.split("\n").length;
    }

}

result.java

public boolean isCodeLine(String line) {
    line = line.trim();
    if (line.startsWith("//"))
        return false;
    else if (line.startsWith("/*"))
        return false;
    else if (line.endsWith("*/"))
        return false;
    else if (line.equals(""))
        return false;
    else 
        return true;
} 
 
public boolean isStartOfBlockComment(String line) {
    if (line.indexOf("/*") != -1)
        return true;
    else
        return false;
}
 
public boolean isEndOfBlockComment(String line) {
    if (line.indexOf("*/") != -1)
        return true;
    else
        return false;
}