operatorsII

Question 1

List the other of operators. Yes all of them

Answer 1

Post-unary operators expression++, expression–
Pre-unary operators ++expression, –expression
Other unary operators +, -, !
Multiplication/Division/Modulus *, /, %
Addition/Subtraction +, -
Shift operators «,&raquo_space;,&raquo_space;>
Relational operators <, >, <=, >=, instanceof
Equal to/not equal to ==, !=
Logical operators &, ^, |
Short-circuit logical operators &&, ||
Ternary operators
Assignment operators

Question 2

Post-unary operators

Answer 2

expression++

Question 3

Pre-unary operators

Answer 3

++expression

Question 4

Other unary operators

Answer 4

+, - and !

Question 5

Shift operators

Answer 5

> > , «.&raquo_space;>

Question 6

Relational operators

Answer 6

> , <, >=, instance of

Question 7

Logical operators

Answer 7

&, ^, |

Question 8

Short circuit logical operators

Answer 8

&&, II

Question 9

The if-then Statement

Answer 9

allowing our application to execute
a particular block of code if and only if a boolean expression evaluates to true at runtime.

if(booleanExpression) {
// Branch if true
}

Question 10

remember it’s a instanceof b

Answer 10

instanceof

NOT
instanceOf

Question 11

what is a instanceof b?

Answer 11

True if the reference that a points to is an instance of
a class, subclass, or class that implements a particular
interface, as named in b

Question 12

Common use of short circuit operator?

Answer 12

A more common example of where short-circuit operators are used is checking for null
objects before performing an operation, such as this:
if(x != null && x.getValue() < 5) {
// Do something
}

if x is null, it’s false and it wont go to x.getValue() and avoid nullpointer exception

Question 13

if(x != null & x.getValue() < 5) {
// Do something
}

if(x != null && x.getValue() < 5) {
// Do something
}

Answer 13

if(x != null & x.getValue() < 5) { // Throws an exception if x is null
// Do something
}

Question 14

What is the output?
int x = 6;
boolean y = (x >= 6) || (++x <= 7);
System.out.println(x);

Answer 14

true
short (other is not ever evualuated)

Question 15

int hourOfDay =1;
int morningGreetingCount=0;
if(hourOfDay < 11)
System.out.println(“Good Morning”);
morningGreetingCount++;
System.out.println(morningGreetingCount);

Answer 15

mourningGreetingCount is 1

Question 16

Will it compile?
int x = 1;
if(x) {
…
}

Answer 16

DNC
int x = 1;
if(x) { // DOES NOT COMPILE
…
}

Question 17

int x = 1;
if(x = 5) {
…
}

Answer 17

DNC
int x = 1;
if(x = 5) { // DOES NOT COMPILE
…
}