book_apex_stuff.java

String info = 'Starting Program';

// SOQL query to load data into object(s)

// Load ALL books into the list of books
List<Book__c> books = [SELECT  Price__c, Name From Book__c]; 

// Load only 1 book into a single book object
Book__c book = [SELECT  Price__c, Name From Book__c limit 1]; 

// run method to update fields
MyHelloWorld.kimIsReallyTheBest(books);

// actually update records in database
update books;

// now set price on books manually

for (Book__c b :books) {
    b.Price__c = 10;
}

// actually update records in database
update books;