If message "command not found" appears, JDK is NOT installed.If the JDK version is prior to 1.8, proceed to Step 2 to install the latest JDK otherwise, proceed to "Step 3: Write a Hello-world Java If a JDK version number is returned (e.g., JDK x.x.x ), then JDK has already been installed.To check if JDK has been installed, open a "Terminal" (Search "Terminal" or Finder ⇒ Go ⇒ Utilities ⇒ Terminal) and issue this command: javas - version Step 1: Check if JDK has been Pre-Installed
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