WILY (What I Learnt Yesterday)
2024
02,February 2024

02,February 2024

2024-02-12

  • Ant : Java based make tool

    • Creating a simple ant build system for HelloWorld project.
    • Understanding of build.xml
    • Build commands of ant like ant compile, ant jar, ant run

  • Java 17 features

    • JEP: Pseudo Random Generator
    • JEP: Switch Expressions
    • JEP: Records - for creating immutable object without the use of lombok
    • JEP: Usage of Objects in switch statement.
    • JEP: Updated instanceof method to avoid redundant casting
    • JEP: Local Variable Type Inference
    • JEP: Sealed Classes using sealed and permits keyword, to restrict the implementation and extension of classes and interfaces in java

    (JEP) - JDK Enhanced Proposal.

2024-02-14

  • Termux Learnings

    • installing packages in termux pkg install git
    • pkg update for package updates.
    • pkg upgrade for package upgrades.
    • pkg edit-sources command to edit sources.list alike files,to change the default mirror

2024-02-15

Java 17 Features

Link to the Java 17 docs

  • Sealed Classes & Interfaces
  • Switch Statements
  • InstanceOf Pattern Matching
  • Switch Expressions
  • Record Classes
  • TextBlocks
  • Strong Encapsulation of JDK Internal API’s
  • Local Variable Type Inference

2024-02-18

  • Nginx
    • To list files in nginx web server use autoindex on within the server TextBlocks

2024-02-19

  • Conventional Commits

Defining a standard format for commit changes,which can be processed by automated tools to produce documentation.

<type>[(optional <scope>)]: <description>
[optional <body>]
[optional <footer>]

Link to docs

  • Descriptive git commit messages.

    git commit -m "Tittle" -m "Description" , a descriptive git commit can be written by using the option -m twice

2024-02-19

  • Project Lombok
    • Link to the docs
    • common annotations used in lombok
    • avoiding boilerplate code with lombok annotations
    • @Getter,@Setter,@RequiredArgsConstructor,@Builder,@Data,@AllArgsConstructor,@NoArgsConstructor

2024-02-26

  • FFMPEG

ffmpeg is a suite of libraries and programs to handle video,audio & other multimedia files and streams.

Joining multiple videos using ffmpeg
$ ffmpeg -f concat -safe 0 -i joinvideo.txt -c copy episode2.mp4

vinay@falcon:~/Documents/blog$ cat ../KumaraParvathaVideo/joinvideo.txt
file kp-peak-rest.mp4
file thick-forest.mp4
file rohan_vlog.mp4

Rotating a video by a certain degree using ffmpeg

ffmpeg -i inputfile.mp4 -vf "transpose=1" outputfile.mp4
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