Below will look for all the java files in the src/ directory, piping each file found to 'wc -l' which will count the lines there.
You get a total at the bottom.
$ find src/ -name '*.java' | xargs wc -l
31 src/main/java/org/denevell/rocklobster/BlogFileCreationUtils.java
20 src/main/java/org/denevell/rocklobster/BlogMarkdownUtils.java
86 src/main/java/org/denevell/rocklobster/utils/ClassUtils.java
39 src/main/java/org/denevell/rocklobster/utils/PaginationUtils.java
30 src/main/java/org/denevell/rocklobster/utils/LogUtils.java
51 src/main/java/org/denevell/rocklobster/utils/FileUtils.java
42 src/main/java/org/denevell/rocklobster/utils/GitUtils.java
42 src/main/java/org/denevell/rocklobster/utils/MetadataUtils.java
39 src/main/java/org/denevell/rocklobster/plugins/SinglePageTagsPlugin.java
45 src/main/java/org/denevell/rocklobster/plugins/PrettyDatePlugin.java
48 src/main/java/org/denevell/rocklobster/plugins/AllTagsPlugin.java
52 src/main/java/org/denevell/rocklobster/plugins/infrastructure/TemplatePluginsContextImpl.java
10 src/main/java/org/denevell/rocklobster/plugins/infrastructure/Plugin.java
8 src/main/java/org/denevell/rocklobster/plugins/infrastructure/TemplatePluginsContext.java
55 src/main/java/org/denevell/rocklobster/blogposts/BlogPost.java
68 src/main/java/org/denevell/rocklobster/templates/PaginatedPageTemplate.java
58 src/main/java/org/denevell/rocklobster/templates/SinglePageTemplate.java
42 src/main/java/org/denevell/rocklobster/templates/PageTemplate.java
33 src/main/java/org/denevell/rocklobster/templates/FilteredPaginatedPageTemplate.java
86 src/main/java/org/denevell/rocklobster/templates/infrastructure/FilteredPaginatedPageTemplateFactory.java
25 src/main/java/org/denevell/rocklobster/templates/infrastructure/SinglePageTemplateFactory.java
48 src/main/java/org/denevell/rocklobster/templates/infrastructure/PaginatedPageTemplateFactory.java
30 src/main/java/org/denevell/rocklobster/templates/infrastructure/PageTemplateFactory.java
54 src/main/java/org/denevell/rocklobster/Main.java
129 src/main/java/org/denevell/rocklobster/BlogPostParsing.java
1171 total