.javaで終わるファイルの総行数

$ find . -name "*.java" | xargs wc -l

こうすると↓こんな感じでカレントディレクトリ以下のディレクトリで
".java"で終わるファイルの行数を足すと何行あるかをカウントできる。

...
     220 src/org/apache/tomcat/util/net/NioChannel.java
    2399 src/org/apache/tomcat/util/net/NioEndpoint.java
     302 src/org/apache/tomcat/util/net/NioSelectorPool.java
     692 src/org/apache/tomcat/util/net/PoolTcpEndpoint.java
     488 src/org/apache/tomcat/util/net/SecureNioChannel.java
     173 src/org/apache/tomcat/util/net/ServerSocketFactory.java
     384 src/org/apache/tomcat/util/net/SocketProperties.java
      27 src/org/apache/tomcat/util/net/SocketStatus.java
      93 src/org/apache/tomcat/util/net/SSLImplementation.java
     130 src/org/apache/tomcat/util/net/SSLSupport.java
     110 src/org/apache/tomcat/util/net/TcpConnection.java
      66 src/org/apache/tomcat/util/net/TcpConnectionHandler.java
     732 src/org/apache/tomcat/util/net/URL.java
     196 src/org/apache/tomcat/util/res/StringManager.java
     844 src/org/apache/tomcat/util/threads/ThreadPool.java
      39 src/org/apache/tomcat/util/threads/ThreadPoolRunnable.java
     102 src/org/apache/tomcat/util/threads/ThreadWithAttributes.java
  327933 total