[JAVA] How to install JDK 8 on Windows without using the installer
How to install JDK 8 on Windows without using the installer
We will introduce how to install (use) the JDK on Windows without using the JDK (Java SE Development Kit) installer (exe file).
Tried environment
OS: Windows10 64-bit JDK：Java SE Development Kit 8u121
Benefits of this method
-Easy switching when developing using multiple JDKs. -You do not have to receive notifications prompting you to upgrade Java.
procedure
1. 1. Download the JDK
Download the JDK for Windows from the Oracle site normally. This time, I downloaded "jdk-8u121-windows-x64.exe" according to the environment.
2. Change the downloaded exe file to zip
Rename the file to change the file extension ".exe" to ".zip".
3. 3. Prepare zip decompression software
Since the decompression function installed in Windows cannot be decompressed well, prepare zip decompression software. This time, I used "7Zip". Click here for the source → https://sevenzip.osdn.jp/
4. Unzip the zip file
Save the file unzipped with 7Zip to a location of your choice. A warning such as "The file cannot be opened as a [zip] archive" is displayed, but don't worry.
5. Extract the CAB file from the unzipped file as needed (* 1)
_ * 1: If "tools.zip" exists in the unzipped folder, this work is not necessary. When I tried it with "jdk-7u51-windows-i586.exe", "tools.zip" was completed when it was unzipped. It seems that it depends on the version of JDK. _
Run the following command:
cd [Unzipped folder path]\.rsrc\1033\JAVA_CAB10
extrac32 111
6. Unzip "tools.zip" and convert it to a jar file
Unzip "tools.zip" in the "[Unzipped folder path] \ .rsrc \ 1033 \ JAVA_CAB10" folder, and execute the following command to convert the .pack file to a .jar file.
cd [Unzipped folder path]\.rsrc\1033\JAVA_CAB10\tools
for /r %x in (*.pack) do .\bin\unpack200 -r "%x" "%~dx%~px%~nx.jar"
7. Move / rename the "tools" folder to a location of your choice
Move the files and folders in the tools folder to any location you like.
In this example, it is "C: \ Java \ jdk-8u121".
↓ It looks like this.
8. Set environment variables and check with java -version command
↓ Add JAVA_HOME as an environment variable.
↓ Add JAVA_HOME to Path.
↓ Check the version with the "java -version" command.
that's all.
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