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Java / Using String

How string concatenation operator (+) works in Java?

When 2 string objects are concatenated, internally Java creates a new StringBuilder object and appends both string objects and returns a new concatenated string by calling toString method on StringBuilder object.

For example, String website="javapedia"+".net"; will translate as below. 

new StringBuilder("javapedia").append(".net").toString();

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System.out.println ("A"=="A");
What is the difference between appending a string to a StringBuilder and concatenating two strings with a + operator? How string concatenation operator (+) works in Java? When the concatenation of final string literal happen? Is Java's SimpleDateFormat thread-safe?
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