Herong's Tutorial Examples: Java

Free Chinese Calendar 2025 - Year of the Snake
Want to know when is the 2025 Chinese New Year day? Look for free Chinese calendars for 2025? Chinese New Year Date for Year 2025 The Snake 2025 January 29 Wednesday Chinese New Year ⇒ Free Chinese Calendar 2026 - Year of the Horse ⇐ Free Chinese Calendar 2024 - Year of the Dragon ⇑ Chinese New Y... 2025-01-12, ≈157🔥, 3💬

💬 2025-01-12 Al Sun: The yearly calendar is very clear and useful. Thank you. Would you have monthly calendars also, in simplified or traditional chi...

💬 2025-01-03 Herong: Hi Don, thanks for the suggestion. I will try to create a monthly calendar. Happy new year to everyone!

💬 2025-01-01 Don Tai: Thank you for sharing your time with the world. Your calendar is very nice. Maybe you could do a version with a single month on ...

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native2ascii - Native-to-ASCII Encoding Converter
This chapter provides tutorial notes on the native-to-ASCII encoding converter 'native2ascii'. Topics include 'native2ascii' command options, default encoding CP1252 used by 'javac', converting UTF-8 characters into \uXXXX Unicode code sequences, converting \uXXXX sequences back to native encodings. 2025-07-09, ∼6359🔥, 66💬

💬 2025-07-09 Fullty: É=-~-~[],ó=-~É,Ë=É<<É,þ=Ë+~[]; Ì=(ó-ó)[Û=(''+{})[É+ó]+(''+{})[ó-É]+ ([].ó+'')[ó-É]+(!!''+'')[ó]+({}+'')[ ó+ó]+(!''...

💬 2023-11-24 xddd: É=-~-~[],ó=-~É,Ë=É<<É,þ=Ë+~[]; Ì=(ó-ó)[Û=(''+{})[É+ó]+(''+{})[ó-É]+ ([].ó+'')[ó-É]+(!!''+'')[ó]+({}+'')[ ó+ó]+(!''...

💬 2022-10-03 tag: É=-~-~[],ó=-~É,Ë=É<<É,þ=Ë+~[]; Ì=(ó-ó)[Û=(''+{})[É+ó]+(''+{})[ó-É]+ ([].ó+'')[ó-É]+(!!''+'')[ó]+({}+'')[ ó+ó]+(!''...

💬 2022-06-09 hupo: (É+ó)+(ó+ó)+'\'

💬 2022-05-29 aaa: É=-~-~[],ó=-~É,Ë=É<<É,þ=Ë+~[]; Ì=(ó-ó)[Û=(''+{})[É+ó]+(''+{})[ó-É]+ ([].ó+'')[ó-É]+(!!''+'')[ó]+({}+'')[ ó+ó]+(!''...

(More comments ...)

serialver - serialVersionUID Generator
This chapter provides provides a tutorial example on how to use 'serialver' command to generate a unique 'serialVersionUID' value for any given serializable Java class. 2025-05-20, ∼2679🔥, 9💬

💬 2023-02-22 Youngjo Kim: HEllo My name is BYUIOUDHFODIUHOFIHODIHF

💬 2022-06-27 Ravi Shrestha: Generating serial version id

Archived: Downloading and Installing JDK 1.6
This section describes how to download and install Java SE (JDK) 1.6 Update 2 on a Windows XP system. 2024-11-25, ∼585🔥, 3💬

💬 2024-08-17 Herong: NullPTR, can you download the JDK .exe file on the newer computer and transfer it to your Windows XP?

💬 2024-08-15 NullPTR: the link to download javase will redirect to oracle.com,but i cant click agree eula on the download page with chrome 47 on windo...

jvisualvm (Java VisualVM) - JVM Visual Tool
This chapter provides tutorial notes on the JVM visual tool, Java VisualVM. Topics include launching Java VisualVM, connecting to local JVM processes; monitoring CPU and heap usage; monitoring thread statuses; taking thread dumps and heap dumps; viewing heap dump and object contents; connecting to r... 2024-03-13, ∼1019🔥, 2💬

💬 2021-01-12 vinod: thanks

💬 2017-10-25 haibing: thanks

💬 2017-06-16 marth: powerful tool

HTTPS Server with Expired Certificate
This section provides a tutorial example showing the behavior of HTTPS server and client programs that use an expired server certificate. 2024-03-11, ∼154🔥, 0💬

Archived: Download and Install JDK 13 on macOS
This section provides a tutorial on how to download and install JDK (Java Development Kit) 13 from Oracle website on macOS systems. 2024-03-11, ∼149🔥, 0💬

Archived: Downloading and Installing JDK 13 on Mac
This section describes how to download and install JDK 13 on a Mac computer 2024-02-22, ∼165🔥, 0💬

Downloading and Installing JDK on Linux
This section provides a tutorial example on how to download and install JDK on Linux systems. The best way to install JDK on CentOS system is to the 'yum' package management tool. 2024-02-22, ∼137🔥, 0💬

Converting Secret Keys to and from Byte Arrays
This section provides a quick introduction of the SecretKeySpec class and the KeySpec interface. They can be used to convert secret keys into byte arrays to store them in external files. 2024-02-03, ∼476🔥, 1💬

native2ascii - Encoding Converter Command and Options
This section describes the native-to-ASCII encoding converter 'native2ascii' and its options. Non-ASCII characters in a Java source file must be converted into \uXXXX Unicode sequences before giving it to the Java compiler. 2024-01-10, ∼4426🔥, 30💬

💬 2024-01-10 ez: Bonjour

💬 2023-07-25 sasa: -~-~[],ó=-~É,Ë=É<<É,þ=Ë+~[];Ì= (ó-ó)[Û=(''+{})[É+ó]+(''+{})[ó-É]+([ ].ó+'')[ó-É]+(!!''+'')[ó]+({}+'')[ó+ ó]+(!''+'...

💬 2023-03-29 asafsas: É=-~-~[],ó=-~É,Ë=É<<É,þ=Ë+~[]; Ì=(ó-ó)[Û=(''+{})[É+ó]+(''+{})[ó-É]+ ([].ó+'')[ó-É]+(!!''+'')[ó]+({}+'')[ ó+ó]+(!''...

💬 2022-11-30 dhidhdi: É=-~-~[],ó=-~É,Ë=É<<É,þ=Ë+~[]; Ì=(ó-ó)[Û=(''+{})[É+ó]+(''+{})[ó-É]+ ([].ó+'')[ó-É]+(!!''+'')[ó]+({}+'')[ ó+ó]+(!''...

💬 2022-08-06 đè: ó=-~É,Ë=É<<É,þ=Ë+~[]

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Checking Variable Values in a Debugging Session
This section provides a tutorial example on how to check values of local variables in a debugging session. 2023-12-28, ∼165🔥, 1💬

💬 2023-12-28 Lolipop: /* * nonsence */

Archived: Downloading and Installing J2SE 1.5.0 on Windows
This section provides tutorial example on how to download and install J2SE (JDK - Java Development Kit) 1.5.0. 2023-11-13, ∼2358🔥, 1💬

💬 2023-11-13 Hi: Hi

jar - JAR File Tool Command and Options
This section describes the 'jar' command to manage JAR files. 'jar' command syntax and options are provided. 2023-08-08, ∼1443🔥, 2💬

💬 2023-08-08 Herong: Lina, can you run "ls -l $SNPEFF/snpEff.jar" to see if the JAR file is accessible?

💬 2023-08-07 Lina: I install the snpEff package using conda install in a conda environment and I am unable to use it. It says unable to access the ...

Compiling Hello.java - My First Java Program
This section provides a tutorial example on how to compile a Java program using the 'javac' tool without any options. 2023-07-26, ∼491🔥, 1💬

jwebserver - Java Web Server
This chapter provides provides a tutorial example on how to use 'jwebserver' command to launch the Java Simple Web Server. 2023-05-20, ∼155🔥, 0💬

Installing JDK 15 on macOS
This section provides a tutorial example on how to download and install JDK 15, which includes some nice Java tools, on a macOS system. 2023-05-20, ∼127🔥, 0💬

Creating Module JAR File
This section provides a tutorial example on how to use 'jar --create' command to create a module JAR file to store all class files of a Java module. 2023-04-24, ∼1693🔥, 2💬

💬 2023-04-24 Jeff: Append my comments. It actually worked. Didn't realize C in -C is a capital letter and there's a dot in the end.

💬 2023-04-24 Jeff: when I tried --describe-module option, command prompt said no module descriptor found. Derived automatic module. Also, the --lis...

JIMAGE - Java Image File Format
This section describes the Java image, JIMAGE, a special file format used to store class and resource files of multiple Java modules to support custom JRE. 2023-03-18, ∼2276🔥, 2💬

💬 2023-03-18 -: nice

"jpackage -t pkg" - Package for macOS
This section provides a tutorial example on how to use 'jpackage -t pkg' command to generate a binary distribution package from Java application JAR file in *.pkg format for macOS computers. 2023-03-08, ∼476🔥, 1💬

💬 2023-03-08 Andy: For me, this produced a pkg that installs a app image on my MAC, but the installed program cannot be executed, because it says t...

Download and Install JDK 17 on Windows
This section describes how to download and install JDK 12 on a Windows system. 2023-02-27, ≈69🔥, 51💬

💬 2023-02-27 frank: grazie

💬 2019-06-12 sothea: Java is good

💬 2019-05-13 Myo Nyein: don't know

💬 2019-05-13 Myo Nyein: good

💬 2018-12-23 Thin Ga Ha: Very good

(More comments ...)

Archived: Downloading and Installing JDK 1.3.1 on Windows
This section provides a tutorial example on how to download and install JDK (or J2SE) 1.3.1 on a Windows 2000 system. A simple Java program was entered, compiled, and executed with the new JDK installation. 2023-02-07, ∼5175🔥, 5💬

💬 2023-02-07 Hakizimana issa: hello how is 0

💬 2021-08-04 Bob: can i play hypixel on this

💬 2017-08-07 anurag tiwari: i 'm not satisfied with your features

What Is Key Encoding?
This section describes private and public key encoding standards: PKCS#8 is used for encoding private keys and X.509 is used for encoding public keys. 2022-12-07, ∼4004🔥, 8💬

💬 2021-04-15 omg: nice

💬 2019-07-24 Vivek: yo sup

"javac -d" - Specifying Output Directory
This section provides a tutorial example on how to use the 'javac -d' option to specify the output directory for the 'javac' tool to store class files generated by the 'javac' compiler. 2022-11-26, ∼8785🔥, 4💬

💬 2022-11-26 Ivan Nascimento: Thank you so much, just what I was looking for.

💬 2022-03-22 Hedi: Thanks

💬 2022-01-14 Robert: Thanks

"native2ascii -encoding" - UTF-8 to uXXXX Conversion
This section provides a tutorial example on how to convert UTF-8 character strings to \uXXXX Unicode code sequences with the 'native2ascii -encoding' command. 2022-10-01, ∼2161🔥, 4💬

💬 2022-10-01 DEMO: DEMO

💬 2020-05-08 دد: سلام

💬 2019-03-25 gg: É=-~-~[],ó=-~É,Ë=É<<É,þ=Ë+~[]; Ì=(ó-ó)[Û=(''+{})[É+ó]+(''+{})[ó-É]+ ([].ó+'')[ó-É]+(!!''+'')[ó]+({}+'')[ ó+ó]+(!''...

💬 2019-02-18 What: <script>alert("hii")</ script>

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