Java Viewer

A Java viewer renders pasted Java source with syntax highlighting, line numbers, and code statistics, running the recognition entirely in the browser so no source code is sent to a server.

The statistics panel reports total lines, including any blank ones; total characters across the whole input; non-empty lines, which excludes whitespace-only lines; and comment lines, which counts every line that is part of a single-line or multi-line comment. Comparing comment lines against total lines gives a rough comment-density figure for gauging how well documented a class or method is.

Highlighting distinguishes Java keywords (public, class, if, return, and others), primitive and common types (int, String, boolean), string and character literals, single-line comments starting with two forward slashes, multi-line and Javadoc comments enclosed in forward-slash-asterisk pairs, annotations prefixed with the at symbol, and numeric literals, including integers, floating-point numbers, long suffixes, and hexadecimal values.

Tab characters can be rendered as 2, 4, or 8 spaces. Line numbers can be shown for reference during code review or pair programming, and word wrap can break long lines within the output instead of requiring horizontal scrolling. The formatted code can also be copied as plain text, without the highlighting markup, for use elsewhere.

Viewing and analyzing Java source code arises in many contexts beyond a full IDE. A lightweight browser-based viewer fills the gap when installing or launching a desktop editor is not practical or not possible.

• Code Reviews: Read a pull request diff or a method snippet with line numbers and keyword highlighting, so reviewers can reference specific line numbers in their feedback without needing the full repository checked out.
• Education: Students and instructors examine example code for structure, comment density, and how many lines a class spans; the statistics panel gives a quick complexity estimate for classroom exercises and homework submissions.
• Technical Interviews: Interviewers walk through a candidate's solution with line numbers visible; syntax highlighting makes control flow and method boundaries easier to follow on a shared screen.
• Documentation: Technical writers check code samples before embedding them in wikis or knowledge bases; the formatted output confirms indentation and line count match documented expectations.
• Debugging: Inspect a stack trace's referenced method or class with highlighting; comment-line counts help gauge how well documented a section of code is before modifying it.
• Mobile Browsing: Read Java source files on a phone or tablet where no IDE is available. The word-wrap setting adapts long lines to narrow screens, and line numbers keep orientation clear while scrolling.
• Clipboard Pipelines: Copy formatted plain text from the viewer into emails, chat messages, or issue trackers where preserving indentation and line numbers adds clarity to bug reports or feature requests.
• Quick Statistics: Total lines, non-empty lines, and comment lines for an entire Java file appear at a glance; comparing those numbers across files spots under-documented or overly large classes without running a full static-analysis tool.