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重點看jdk的綁定
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Check your Eclipse preferences: Java -> Installed JREs. The one that you're using should be marked and it should be a JDK not just a JRE. Also check your project's build path: Right click on the project -> Properties -> Java Build Path Check in the "libraries" folder whether the JRE System Library is present and if not add it using "Add library"->"JRE System Library" and then select the correct one (from an installed JDK). |