Java / Using String

Can we compare String and StringBuffer objects in Java?

Although both String and StringBuffer represent String objects, we cannot compare each other and if we try to compare them, we get an exception.

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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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