Java is already installed. It's not very good, but it's still there.
You can't install anything onto a Wii without Homebrew.
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No. Wii's don't support Java applets.
Macs can play Runescape as long as you have Java installed and have a working internet connection, the faster the better. This is simply because Runescape is an application written in Java; without Java, you cannot run Runescape on your computer. You can download Java from this link if you do not already have it installed: http://www.java.com/en/
Sorry to disappoint you - but the answer is no. You must have Java installed onto your computer in order to play Minecraft, since Minecraft is a Java programmed game and runs in Java. I have provided a download link for the latest Java build in the related links below.
First of all, do you have Java installed? Second, if you do have Java installed, then did you incorrectly apply a mod or texture pack? One thing you can do to stop this is deleting, and reinstalling Minecraft. Before you do this, be sure to get a copy of your save files.
There is no fix for this, you bricked your wii.. this is a recent discovery while installing injected VC games