Count lines of code

How to count lines of code in Mac? Here's a way to check several file formats:

1. Count the number of lines of code in an XML file

   use the following command

   find . "(" -name "*.xml" ")" -print | xargs wc -l

2. Count the number of lines of java code

   use the following command

   find . "(" -name "*.java" ")" -print | xargs wc -l

3. Count the number of lines of code in files such as .m .h .cpp .mm

   use the following command   

    find . "(" -name "*.m" -or -name "*.mm" -or -name "*.cpp" -or -name "*.h" -or -name "*.c" ")" -print | xargs wc -l