It's the Apple icon in the upper-left of the top menu bar. This opens a drop-down menu. It's the second option from the top of the drop-down menu. It's the icon with the blue coffee cup and orange steam. Clicking it opens the Java Control Panel in a new window. If you don't see the Java icon, you do not have Java installed. This screen will tell you if you what version of Java you have, and if you need to update Java. If there is an update available, follow the instructions to update to the latest recommended version of Java. You can also check the box for "Check for Automatic Updates" so your version will always be updated to the latest versions when they are available.
System Preferences Java टॉप पर दिए गए Update पर टैप करें: