How Do I Configure Multiple JDKs in Eclipse for Different Java Versions?

Configuring Multiple JDKs in Eclipse

When working with multiple Java Development Kits (JDKs), it becomes necessary to manage them within Eclipse to seamlessly build projects using different Java versions. This question addresses adding custom JDKs to Eclipse's list of available compilers, allowing developers to target specific Java versions.

To configure multiple JDKs in Eclipse, follow the steps outlined in the provided answer:

1. Navigate to Window > Preferences > Java > Installed JRE's.
2. In the Preferences window, use the Add... button to list the desired JDKs.
3. Ensure that the new JDKs are listed in the Installed JREs section.

Once the JDKs are added to the IDE, the project's build path configuration can be adjusted to utilize these JDKs:

1. Right-click on the project and select Properties.
2. In the Properties window, navigate to the Libraries tab.
3. Under the JRE System Library subsection, click on Add Library and select the appropriate JDK to compile with.

Additionally, the mentioned "back-level compiler version" option refers to the ability of certain compilers to target earlier Java versions. This explains why additional version options may appear in the project build path configuration dialog, allowing developers to compile code using older Java versions.

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