I'm a beginner and could someone tell me haw to run and install java
If you can run java apps on the internet, you already have java installed. To get it, go to java.com: Java + You.
To 'run' java I presume you mean, write your own code? Easiest way as a beginner is to download a good IDE (Netbeans is usually recommended) and start from there.
To write java code & compile you'll need the JDK( java development kit) i don't think that's always installed on your computer if you can allready run java apps on the internet.
To run java files (.jar) you need a JRE(java runtime environment) installed.
I think most IDEs are smart enough to find the Java files themselves ones those are installed. So not much configuration would be required at first.
Go to the Java website and download the latest JDK. You also will probably want some sort of IDE. Two great environments to write Java in are NetBeans and Eclipse.
I personally don't recommend using a flashy IDE when starting off. They can indeed be very helpful, but I think they are just messy. I would use a simple SciTE and the JDK command line compiler. It may a bit "slow", but its straight, simple and you don't get confused. I don't got hand on a link to a good setup tutorial in English, but just make a search and you should find plenty.
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