No. But some programs may not run with out it.
You can enable/download it when needed.
As of 10.7 it will not install Java until you try to use something that needs it. It saves download time and drive space when initially installing the OS.
Basically that is telling you to enable javascript in your browser. Come back with your browser name and someone could tell you how to enable javascript in it.
Well you get java as java and javascript as iava.
Java can be trusted, just enable the script at the prompt.
The latest version of JavaScript is available on the Java website. It is most likely that a user has the most updated version because they are prompted to update if they visit a page with an older version.
Javascript can be enabled or disabled in the browsers settings. You might currently have it turned off.
In general, no you do not need Java or JavaScript to play music on your computer. However, if you want to hear music played by a website, there's a good chance that it uses one of these technologies to do it, in which case you would need Java or a JavaScript enabled browser.
No, Java and JavaScript are nothing to do with each other, JavaScript is a form of EMCAScript, not Java. Every modern browser comes with a JavaScript engine that is used to understand JavaScript. so there is no need for it, no.
they have java< javascript and flash
There is no systemout object in JavaScript. Do you mean Java?
Javascript cannot be disabled but java can just go to Control Panel > Sun Java Panel > Disable
JavaScript and java are 2 completely different things. JavaScript is in web pages to make it more interesting and java is a complex computing language devised from c + c++.
JavaScript and Java are two different programming languages. Java is a server-side, statically typed language. JavaScript is a mostly client-side, dynamically typed language. Java supports heavy back end computations while JavaScript enables interactive AJAX ones.