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2. What is the difference between == and equals () in Java?

   stackoverflow.com/questions/7520432

   Since java.lang.String class override equals method, It return true if two String object contains same content but == will only return true if two references are pointing to same object. Here is an example of comparing two Strings in Java for equality using == and equals() method which will clear some doubts:

3. How do the post increment (i++) and pre increment (++i) operators...

   stackoverflow.com/questions/2371118

   i = 7 + 6 + 7. Working: pre/post increment has "right to left" Associativity , and pre has precedence over post , so first of all pre increment will be solve as (++a + ++a) => 7 + 6 . then a=7 is provided to post increment => 7 + 6 + 7 =20 and a =8. a=5; i=a++ + ++a + ++a; is. i=7 + 7 + 6.

4. What are the -Xms and -Xmx parameters when starting JVM?

   stackoverflow.com/questions/14763079

   The flag Xmx specifies the maximum memory allocation pool for a Java Virtual Machine (JVM), while Xms specifies the initial memory allocation pool. This means that your JVM will be started with Xms amount of memory and will be able to use a maximum of Xmx amount of memory. For example, starting a JVM like below will start it with 256 MB of ...

5. What is the percent % operator in java? - Stack Overflow

   stackoverflow.com/questions/43975824

   n%10 means the modulus of 10, that is the remainder you get when you divide with 10. Here it is used to get each digit. Example: Say your number is n = 752. n%10 = 2, n/10 = 75. So you add 2 to the sumDigits(75) Now, n%10 = 75%10 = 5. This is the digit to be added and so on, till your n >= 10. When it is < 10, you have a single digit that you ...

6. java - && (AND) and || (OR) in IF statements - Stack Overflow

   stackoverflow.com/questions/1795808

   78. Java has 5 different boolean compare operators: &, &&, |, ||, ^. & and && are "and" operators, | and || "or" operators, ^ is "xor". The single ones will check every parameter, regardless of the values, before checking the values of the parameters. The double ones will first check the left parameter and its value and if true (||) or false ...

7. What is the Java ?: operator called and what does it do?

   stackoverflow.com/questions/798545

   Yes, it is a shorthand form of. count = getHereCount(index); count = getAwayCount(index); It's called the conditional operator. Many people (erroneously) call it the ternary operator, because it's the only ternary (three-argument) operator in Java, C, C++, and probably many other languages.

8. What does the ^ operator do in Java? - Stack Overflow

   stackoverflow.com/questions/1991380

   It is the Bitwise xor operator in java which results 1 for different value of bit (ie 1 ^ 0 = 1) and 0 for same value of bit (ie 0 ^ 0 = 0) when a number is written in binary form. ex :-. To use your example: The binary representation of 5 is 0101. The binary representation of 4 is 0100.

9. What is the difference between & and && in Java?

   stackoverflow.com/questions/5564410

   While && operator will stop evaluating the second argument if the first argument's result is false. One more difference between these two is, Bitwise & operator is applicable for boolean as well as integral types. While short-circuit && operator is applicable only for the boolean type. We can write.

10. in java what does the @ symbol mean? - Stack Overflow

    stackoverflow.com/questions/31822020

    In Java Persistence API you use them to map a Java class with database tables. For example @Table() Used to map the particular Java class to the date base table. @Entity Represents that the class is an entity class. Similarly you can use many annotations to map individual columns, generate ids, generate version, relationships etc.

11. Proper usage of Java -D command-line parameters

    stackoverflow.com/questions/5045608

    Try this: java -Dtest="true" -jar myApplication.jar. From the command line help: java [-options] -jar jarfile [args...] In other words, the way you've got it at the moment will treat -Dtest="true" as one of the arguments to pass to main instead of as a JVM argument. (You should probably also drop the quotes, but it may well work anyway - it ...