Do I need to be expert in Java if I want to develope a website or web application? Java seems to be more tough. From where I can get help if I want to learn Java on my own? Looking for help.....
Note that, Java and Javascript are entirely different programming languages. Download The Java SE (Standard Edition) tutorial from Sun Microsystems. You'll need Java Development Kit (JDK) for Java SE 6 and editor like JCreator or NetBeans.
This is the wrong place for a Java discussion... Java is a Server side language (mostly in web applications that is). JavaScript runs in the browser. Nowadays though strong JavaScript knowledge is ALOT more important than Java knowledge... IMHO especially for snappy Web 2.0 web applications...
Note that you can't create real WEB app without any server side language (Java, PHP, and etc.). So, your sentence has no big sense.