how to change jdk java compiler version in eclipse
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changing the jdk (java development kit) version in eclipse is a common task, especially when you're working on projects that require different java versions. below is a step-by-step tutorial on how to change the jdk version for a project in eclipse, including how to set the default jdk for new projects.
step 1: install the desired jdk version
before changing the jdk version in eclipse, make sure you've installed the desired jdk version on your system. you can download the jdk from the official oracle website or from the openjdk website.
step 2: open eclipse and configure installed jres
1. **launch eclipse**: open your eclipse ide.
2. **access preferences**: go to `window` (on windows) or `eclipse` (on macos) in the menu bar and select `preferences`.
3. **java installed jres**:
navigate to `java` `installed jres`.
here, you will see a list of installed jres. click on `add...` to add a new jdk.
4. **add jdk**:
select `standard vm` and click `next`.
in the `jre home` field, browse to the location of your installed jdk (e.g., `c:\program files\java\jdk-17.0.1`).
give it a name (e.g., `jdk 17`) and click `finish`.
5. **set default jre**:
to set the newly added jdk as the default jre, check the box next to it in the installed jres list.
click `apply` and then `ok`.
step 3: change jdk version for an existing project
1. **select your project**: in the `package explorer`, right-click on the project for which you want to change the jdk version.
2. **properties**: select `properties` from the context menu.
3. **java build path**:
in the project properties window, click on `java build path`.
go to the `libraries` tab and look for the `jre system library`. select it and click on `remove`.
4. **add jre**:
click on `add library...`.
choose `jre system library` and click `next`.
select `alternate jre` and choose the new jdk version you just added. click `finish`.
5. **apply changes**: click `apply and close ...
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