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1. Menu Window-Preferences-Java_installed JREs, as shown below:
2. Select the appropriate jre, click on the right side Edit, as shown below:
3. select rt.jar, click Source Attachment, as shown below:
4. select External location, click External File, as shown below:
5. jdk installation root found, select src. zip, as shown below:
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Original link: https: //blog.csdn.net/u014071875/article/details/78844151
