Where can I learn java for free?

Quote:

where I could learn java for free

learn java for free - Google Search[^]

Quote:

what IDE should I use?

what ide should i use for java - Google Search[^]

Google is your friend: Be nice and visit him often. He can answer questions a lot more quickly than posting them here...
In future, please try to do at least basic research yourself, and not waste your time or ours.

Quote:

where I could learn java for free

At home, reading a free book (though dated, Bruce Eckel's book[^] provides a good introduction) or a tutorial. Making practice.

Quote:

Also what IDE should I use?

Use the IDE you like the most. Here[^] you may find a comparison of the most popular ones. For simple test programs you don't even need an IDE: use your favourite text editor for writing the program and compile it from the shell, launching the javac compiler, finally run it using the java executable.