Don't how to start java

i am very new to java,
i just to know should i keep going with java or not because i took a class by using a book by Tony Gaddis, titled Starting with java 5
the first 4 chapter seemed a little easy to me, but right after that the rest of the chapter 5-8,i was completely lost when it had arrays or static method. it tougher and tougher .
i don't know should I keep going from chapter 8 to the end of the book or not.

i got some of the basic,
i can follow the chapter pretty well,but my main is i
don't know to how to do the assignments, i read 3
time and i don't know where to start usually.whats the purpose of the assignment?. post your assignment. secondly arrays, arraylist and strings are very important in java and specially the OO methdaology. if you dont understand try to buy a new book an easy one. i started from this website.
http://chortle.ccsu.edu/java5/cs151java.html

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