Question

Why main() method is always static, void and public?

What is the assignment compatibility and why is it necessary?

Why floating-point numbers have round-off errors?

What are good programming styles?

Some predefined Classes with mostly static methods and purposes of some of these methods.

Commonly used String Class methods.

What are trade-offs between ifstatements and switchstatements?

What operators have Right-to-Left Associativity?

What are expression side effects and what are their trade-offs?

What is the difference(s) between while loops and do-while loops?

What are differences/similarities between break statements andcontinue statements?

What are common loop errors and what are their most probable causes?

What are primary purposes of local variables and where inside your programs can they appear?

How does call-by-value(parameter transmission) mechanism work and when is it used?

What is the this parameter and when can it be omitted and when should it be required?

What are some good tools for Information Hiding?

What are static methods and what are their trade-offs?

What are differences between primitive parameters and Class parameters?

What are Copy Constructors and why are they useful?

Compare selectionSort and bubbleSort.

Compare recursion and iteration.

What happens if the < operator is replaced by the == operator on the line-30, Display-6.11, Page 390 and why?

Answer 1

Answer 1. This is necessary because main() is called by the JVM before any objects are made. Since it is static it can be straightforwardly summoned via the class. Similarly, we utilize static at some point for client characterized methods so we require not to make objects. void indicates that the main() method is declared does not return a value.

Answer 3. This is because a few fractions require a large (or even unbounded) amount of places to be communicated without adjusting. This remains constant for decimal notation as much as for binary or any other. In the event that you would confine the number of decimal places to use for your calculations (and avoid making calculations in fraction notation), you would have to round even a straightforward expression as 1/3 + 1/3. Instead of composing 2/3, therefore, you would have to compose 0.33333 + 0.33333 = 0.66666 which isn't identical to 2/3.

In case of a PC, the quantity of digits is constrained by the technical nature of its memory and CPU registers. The binary notation utilized internally adds some more troubles. PCs normally can't express numbers in fraction notation, however, some programming languages add this ability, which allows those issues to be avoided to a certain degree.

Answer 10. The while loop checks the condition at the starting of the loop and if the condition is satisfied statement inside the loop, is executed. In the do-while loop, the condition is checked after the execution of all statements in the body of the loop.

In the event that the condition in a while loop is false not a solitary statement inside the loop is executed, and if the condition in 'do-while' loop is false then also the body of the loop is executed at least once then the condition is tried.

Answer 19. Copy constructor creates another question of the same class utilizing a current protest. It creates a copy/replica of the current protest.

It duplicates value of all part variables from existing article to new protest. It duplicates values part-to-part.

It will be called when:

At the point when a protest is built based on another question of the same class.

At the point when a question of the class is passed (to a capacity) by value as an argument.

At the point when a question of the class is returned by value.

At the point when the compiler generates a temporary protest.

Copy constructors are important for incredible same reasons as a regular constructor would be, and that is to legitimately initialize the developed protest. Development isn't always trivial, and it doesn't make a difference where do you take the data from and in what frame - other question of the same class or an arrangement of less complex arguments.

In this way, the copy constructor is there to take care of issues like initializing const fields, yet in addition when you utilize pointers, to choose responsibility for the pointed asset. You may want to share or duplicate the data.