javac在mac執行出錯

首發 04. 02, 2021 修改 04. 02, 2021 455

執行java是正常 

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>> java -version

java version "16" 2021-03-16
Java(TM) SE Runtime Environment (build 16+36-2231)
Java HotSpot(TM) 64-Bit Server VM (build 16+36-2231, mixed mode, sharing)

但是執行javac時顯示 

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>> javac -version

The operation couldn’t be completed. Unable to locate a Java Runtime that supports javac.
Please visit http://www.java.com for information on installing Java.
原因是只安裝了jre沒裝jdk，安裝jdk後 
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>> javac -version

javac 16