Java Enum Best Practice

Table of Contents

• Java Enum
• Item 35: Use instance fields instead of ordinals
• Use EnumSet
• Implement interface
• Use enum for Singleton class
• Prefer equals() over ==
• Add abstract methods(constant-specific method implementations) to enum
• Create an enum with Case Insensitive String
• Misc Tips about Enum

Better Bash history

Table of Contents

• Sync Bash History Between Terminals
• Increase Bash History Size
• Store bash history immediately
• Use one command per line
• Add date and time to bash history
• HISTCONTROL: how commands are saved
• HISTIGNORE: Ignore specific commands
• Others setting about bash history
• History searching
• The Complete Setting for Bash History

Java Varargs Best Practice

Table of Contents

• Varargs
• Don’t use Varargs unless really needed
• Require one
• Good Cases to Use Varargs
• Performance-critical Methods
• Careful when Overloading with Varargs
• Careful when Overloading with Varargs and Autoboxing
• Java Generic and Array doesn’t mix well
• Item 32: Combine generics and varargs judiciously
• Varargs gotchas: passing an array, a collection into varargs
• @SafeVarargs

How to Simplify and Improve Code

Table of Contents

• Remove Redundant
• Inline
• Reduce the nesting/wrapping caused by if or lambda
• Simplify lambda
• Use static import to simplify code
• Import nested class
• Merge
• Avoid String.format when the method already supports formatting
• Method that takes vargs
• Optional
• Misc Tips about Code Simplification

Javadoc Best Practice

Table of Contents

• What to Comment
• The summary fragment
• Where to Write Javadoc
• Javadoc for class
• Params
• throws
• Overriding
• Use minimal HTML tags, not valid XHTML
• [@link and @code](https://blog.joda.org/2012/11/javadoc-coding-standards.html)
• More Elements
• Deprecated
• More Javadoc Annotations
• Misc Tips about Javadoc
• Common Mistake when Write Javadoc

Mastering IntelliJ IDEA Keyboard Shortcuts in Linux and Windows

Table of Contents

• Find action
• Quick Lists
• Disable Linux Default Shortcuts
• Customize Shortcuts
• Common shortcuts
• Shortcuts for Navigation
• Shortcuts for Refactoring
• Shortcuts for Debugging
• Presentation Mode
• More tips about shortcuts

Mac Settings We should Change

Table of Contents

• Tweak Trackpad
• Tweak Dock
• Tweak Touch Bar
• Turn off iCloud Drive
• Preferences > General
• Turn screen corners into shortcuts
• Install apps downloaded from web:

Must-Know Chrome DevTools Tips and Tricks

Table of Contents

• DevTools Keyboard Shortcuts
• Ctrl+Shift+P to Run command
• Inject CSS
• Network Tab
• Sources Tab
• Elements tab
  • Console tab
  • Other Chrome DevTools Tips

The Awesome .bashrc File

Table of Contents

• Frequently accessed directories
• Command Shortcuts
• Compatible with commands from other OS
• Command Options
• Better Bash History
• SSH Hosts
• .bashrc vs .bash_profile
• Organize .basrch

Mac Finder Tips and Tricks

Table of Contents

• Maximize Finder Window Size with Relaunch
• Change Default Finder Window other than default “Recents”
• Search Current Folder instead of “This Mac”
• Customize List/Icon View
• Customize the sidebar
• Show Path Bar
• Customize the Toolbar
• Quick Look
• Hold Option Key while Click
• Everything about File or Folder Path on Mac
• Show Me More Info: Filename Extension and Hidden Files
• Reveal Files in Finder in Spotlight
• Search, Saved Search(Smart Folder)
• More Tips for Mac Finder
• Finder Shortcuts We Should Know

Everything about File or Folder Path on Mac

Table of Contents

• Copy a File or Folder Path from Context Menu
• Copy a File or Folder Path at Path Bar
• Get File or Folder Path at iTerm2(or Terminal)
• Go to the Parent Folder (of a File or Folder) at Iterm2(or Terminal)
• “New iTerm2 Tab” in Finder
• Assign Keyboard Shortcut to “New iTerm2 Tab” at Finder

Google Drive Tips and Tricks

Table of Contents

• Keyboard shortcuts for Google Drive
• Search Tips and Tricks for Google Drive
• Manage Storage: Use Less Space to Store More Files
• Organize Files/Folders
• Share Files on the Web
• More Tips about Google Drive

Best Google Chrome Extensions in 2019

Table of Contents

• Must-Have Chrome Extensions
• Chrome Extensions for Tabs
• Chrome Extensions for Reading
• Chrome Extensions for Writing
• Chrome Extensions for Sharing
• Chrome Extensions For Developer
• Chrome Extensions for Productivity
• Chrome Extensions for Youtube
• Chrome Extensions for Hacking
• Chrome Vimium
• How To Reduce Chrome Memory Usage

How to Avoid NullPointerException in Java Part 1

Table of Contents

• Related Posts
• Check Null
• Use null safe methods and libraries
• Return empty collection/array, instead returning null
• Throw exceptions instead return a null or an empty string
• Unboxing and NullPointerException
• NullPointerException related with Collection
  • Check whether collection is Null before loop
  • Copying between different collection may throw NullPointerException
  • Use Advanced Data Structure: Multimap, HashBasedTable
  • Avoid null key or null value in the collection
  • Rules for using primitive data types and wrapper classes
  • Use Optional Class
  • Check Null explicitly, don’t catch NullPointerException
  • Convenience methods to work with Null
  • Other NullPointerException Cases
  • Check Whether nullable
  • NullPointer Bugs
  • Resources

Youtube Tips and Tricks

Table of Contents

• Awesome Tips Series about Google Products
• Chrome Extensions for Youtube
  • Always on top Floating Mini Player for YouTube™.
  • Embed a video or playlist
• Tips about Youtube
  • Switch account in Youtube
• Shortcuts
  • Customize Chrome Vimium
  • Skipping
  • Youtube Search Tips
• Kids
• Youtube App Settings
  • Trending
  • Frequently Accessed Urls
• How to Spend Less Time on Youtube
• Channels + Explore
• Youtube for Developers
• Different Profiles: how to separate videos work profession skills and entertainment in youtube
• Youtube Search Urls
• Support
  • Related Posts

Awesome Tips, Tricks about Gmail

Table of Contents

• Dark Mode
• Write Email Now And Send It Later
• Create an event directly from Gmail
• Create an account or schedule an event directly from Gmail
• Snooze Emails
• Draft Emails
• Categories
• Labels
• Filters
• Delete Emails
• Print Emails
• Canned Responses
• Gmail Search Tips
• More Tips
  • Related Posts

How to Google Search Like a Pro

Table of Contents

• Awesome Tips Series about Google Products
• Search to find info first
• Google Search Tips
  • How to restrict search by a date range
  • Usage rights
• Custom Search Engines in Chrome
• Search the Chrome History
  • Use Chrome History to find/reopen recently closed pages
• Remove History to Make Search Address Bar Work Better
• Gmail Search Tips
• Youtube Search Tips
  • Youtube Search Urls
• Misc
  • Feeling lucky:
  • Related Posts

How to Keep Mac from Overheating

Table of Contents

• How to Keep Your Mac from Overheating
• Use Screen Corners to Put Display Into Sleep
• How to Reduce Chrome Memory Usage

Awesome Tips about Chrome

Table of Contents

• Chrome Shortcuts
• Must-Have Google Chrome Extensions
• How to Speed up Google Chrome
• Custom Search Engines in Chrome
• Bookmarks
• Chrome Urls
• Tips abut Chrome

How to Improve Problem Solving Skills - A Developer's Guide

How to Improve Problem Solving Skills

Jeffery Yuan

April 24, 2019

Table of Contents

• Why Problem-solving skills matters
  • Problem Solving and troubleshooting
  • Solve the Problem when Needed
• How to Solve a Problem
  • Understand the Problem/environment First
  • Check the Log and Error Message
  • Case Study – The Log and Error Message
    • Problem: Failed to talk Cassandra server: 10.10.10.10
  • Source code is always the ultimate truth
  • Reproduce the problem
  • Solving Problem from Different Angles
  • Find Information Effectively
  • Find Information Effectively Cont.
  • How to Troubleshoot and Debug
  • Resource About Troubleshooting
  • Urgent Issues in Production
• Ask for help
  • Before
  • Where and Who
  • How to Ask Help
  • Learn more
  • Fix same/similar/related problems in other places
• Knowledge & Tools
  • Knowledge
  • Knowledge cont.
    • Common Problems
  • Tools - Eclipse
  • Practice - Connect to the remote data in local dev
  • Tools - Decompiler
  • Tools - Java
  • Tools - Splunk
  • Tools - Misc
• Problem Solving in Practice
  • Example: Redis cache.put Hangs
  • Practice - Iterator vs Iterable
  • Practice - Iterator vs Iterable
  • Practice 2 - Spring Cacheable Not Working
• Post Mortem
  • Reflection: Lesson Learned
  • Think More
• Bonus
  • Building Troubleshooting-Friendly Application
  • How to write test efficiently
• The End
  • This presentation was built using Reveal.js, Markdown and Github Pages