Java 2

Java Operators
The operators in Java are like the following :
1.  Arithme*c
operators
.

2.  Rela*onal
operators.

3.  Logical
operators.

4.  Assignment
operators.

Arithmetic Operators
Operator
Descrip-on
Example

+
Addi-on
–
Adds
values
on
either
side
of
the
operator
A + B will give 30
-‐
Subtrac-on
–
Subtracts
right
hand
from
le?
hand

A - B will give -10
*
Mul-plica-on
-‐
Mul-plies
values
on
either
side
of
the
operator

A * B will give 200
/
Division
-‐
Divides
le?
hand
operand
by
right
hand
operand

B / A will give 2
%

Modulus
-‐
Divides
le?
hand
operand
by
right
hand
operand
and

returns
remainder

B % A will give 0
++
Increment
-‐
Increases
the
value
of
operand
by
1

B++ gives 21
-‐-‐
Decrement
-‐
Decreases
the
value
of
operand
by
1

B-- gives 19
Arithmetic operators are used in mathematical expressions in the same way that they
are used in algebra.
The following table lists the arithmetic operators:
Assume integer variable A holds 10 and variable B holds 20, then:

public static void main(String[] args) {
int A , B ;
A=10 ;
B=20 ;
System.out.println ( A + B ) ;
}
010101010101010101010101

30

Addition Operator
A=10 B=20

int A , B ;
A=10 ;
B=20 ;
System.out.println ( A - B ) ;
}
010101010101010101010101

-10

Subtraction Operator
A=10 B=20

int A , B ;
A=10 ;
B=20 ;
System.out.println ( A * B ) ;
}
010101010101010101010101

200

Multiplication Operators
A=10 B=20

int A , B ;
A=10 ;
B=20 ;
System.out.println ( B / A ) ;
}
010101010101010101010101

2

Divition Operator
A=10 B=20

int A , B ;
A=10 ;
B=20 ;
System.out.println ( B % A ) ;
}
010101010101010101010101

0

Modulus Operator
A=10 B=20

int A , B ;
A=10 ;
B=20 ;
System.out.println ( + + B ) ;
}
010101010101010101010101

Increment Operator
A=10 B=20

int A , B ;
A=10 ;
B=20 ;
}
010101010101010101010101

Increment Operator
A=10 B=21

int A , B ;
A=10 ;
B=20 ;
}
010101010101010101010101

Increment Operator
A=10 B=21
21

int A , B ;
A=10 ;
B=20 ;
System.out.println (B + +) ;
}
010101010101010101010101

20

Increment Operator
A=10 B=20

int A , B ;
A=10 ;
B=20 ;
System.out.println (B + +) ;
}
010101010101010101010101

20

Increment Operator
A=10 B=21

int A , B ;
A=10 ;
B=20 ;
System.out.println ( - - B) ;
}
010101010101010101010101

Decrement Operator
A=10 B=20

int A , B ;
A=10 ;
B=20 ;
}
010101010101010101010101

Decrement Operator
A=10 B=19

int A , B ;
A=10 ;
B=20 ;
}
010101010101010101010101

Decrement Operator
A=10 B=19
19

int A , B ;
A=10 ;
B=20 ;
System.out.println ( B - - ) ;
}
010101010101010101010101

Decrement Operator
A=10 B=20

int A , B ;
A=10 ;
B=20 ;
}
010101010101010101010101

20

Decrement Operator
A=10 B=20

int A , B ;
A=10 ;
B=20 ;
}
010101010101010101010101

20

Decrement Operator
A=10 B=19

Relational Operators
operator
Descrip-on
Example

==

Checks
if
the
values
of
two
operands
are
equal
or
not,
if
yes
then

condi-on
becomes
true.

(equal
)

(A
==
B)
is
not
true.

!=

Checks
if
the
values
of
two
operands
are
equal
or
not,
if
values
are
not

equal
then
condi-on
becomes
true.

(
not
equal
)

(A
!=
B)
is
true.

>

Checks
if
the
value
of
le?
operand
is
greater
than
the
value
of
right

operand,
if
yes
then
condi-on
becomes
true.

(
greater
than)

(A
>
B)
is
not
true.

<

Checks
if
the
value
of
le?
operand
is
less
than
the
value
of
right
operand,

if
yes
then
condi-on
becomes
true.

(
Less
than)

(A
<
B)
is
true.

>=

Checks
if
the
value
of
le?
operand
is
greater
than
or
equal
to
the
value
of

right
operand,
if
yes
then
condi-on
becomes
true.

(A
>=
B)
is
not
true.

<=

Checks
if
the
value
of
le?
operand
is
less
than
or
equal
to
the
value
of

right
operand,
if
yes
then
condi-on
becomes
true.

(A
<=
B)
is
true.

There are following relational operators supported by Java language:
Assume variable A holds 10 and variable B holds 20 , then:

int x , y ;
x = 10 ;
y = 20 ;
System.out.println ( x = = y ) ;
}
010101010101010101010101

False

x = 10 y = 20

int x , y ;
x = 10 ;
y = 20 ;
System.out.println ( x ! = y ) ;
}
010101010101010101010101

True

x = 10 y = 20

int x , y ;
x = 10 ;
y = 20 ;
System.out.println ( x > y ) ;
}
010101010101010101010101

False

x = 10 y = 20

int x , y ;
x = 10 ;
y = 20 ;
System.out.println ( x < y ) ;
}
010101010101010101010101

True

x = 10 y = 20

int x , y ;
x = 10 ;
y = 20 ;
System.out.println ( x > = y ) ;
}
010101010101010101010101

False

x = 10 y = 20

int x , y ;
x = 10 ;
y = 20 ;
System.out.println ( x < = y ) ;
}
010101010101010101010101

True

x = 10 y = 20

Logical Operators
Operator
Descrip-on
Example

&&

Called
Logical
AND
operator.
If
both
the
operands

are
non-‐zero,
then
the
condi-on
becomes
true.

(A
&&
B)
is
false.

||

Called
Logical
OR
Operator.
If
any
of
the
two

operands
are
non-‐zero,
then
the
condi-on
becomes

true.

(A
||
B)
is
true.

!

Called
Logical
NOT
Operator.
Use
to
reverses
the

logical
state
of
its
operand.
If
a
condi-on
is
true
then

Logical
NOT
operator
will
make
false.

!(A
&&
B)
is
true.

The following table lists the logical operators:
Assume Boolean variables A holds true and variable B holds false , then:

int test = 6 ;
If ( test = = 9 ) {
System.out.println( “ yes ” ) ;
} else {
System.out.println( “ this is else ” ) ;
}
}
010101010101010101010101

this is else

If Statement
test = 6

int boy , girl ;
boy = 18 ;
girl = 68 ;
If ( boy > 10 ) {
System.out.println(“you can enter”) ;
}else{
System.out.println(“you are too young”)
}
}
010101010101010101010101

You can enter

Logical Operators
boy = 18 girl = 68

int boy , girl ;
boy = 18 ;
girl = 68 ;
If ( boy > 10 && girl < 60 ) {
}else{
System.out.println(“you are too young”);
}
}
010101010101010101010101

You are too young

Logical Operators
boy = 18 girl = 68

int boy , girl ;
boy = 18 ;
girl = 68 ;
If ( boy > 10 | | girl < 60 ) {
}else{
}
}
010101010101010101010101

You can enter

Logical Operators
boy = 18 girl = 68

int boy , girl ;
boy = 18 ;
girl = 68 ;
If (!( boy > 10 && girl < 60 )) {
}else{
}
}
010101010101010101010101

you can enter

Logical Operators
boy = 18 girl = 68

int age ;
age = 3 ;
Switch( age ) {
case1 :
System.out.println(“you can crawl”) ;
break ;
case2 :
System.out.println(“you can talk”) ;
break ;
case3 :
System.out.println(“you can get in trouble”) ;
break ;
default :
System.out.println(“I don’t know how old are you”)
}
010101010101010101010101

you can get in trouble

Logical Operators
age= 3

Assignment Operators
Operator
Descrip-on
Example

=

Simple
assignment
operator,
Assigns
values
from

right
side
operands
to
le?
side
operand

C
=
A
+
B
will
assign
value
of

A
+
B
into
C

+=

Add
AND
assignment
operator,
It
adds
right
operand

to
the
le?
operand
and
assign
the
result
to
le?

operand

C
+=
A
is
equivalent
to
C
=
C
+
A

-‐=

Subtract
AND
assignment
operator,
It
subtracts
right

operand
from
the
le?
operand
and
assign
the
result

to
le?
operand

C
-‐=
A
is
equivalent
to
C
=
C
-‐
A

*=

Mul-ply
AND
assignment
operator,
It
mul-plies

right
operand
with
the
le?
operand
and
assign
the

result
to
le?
operand

C
*=
A
is
equivalent
to
C
=
C
*
A

/=

Divide
AND
assignment
operator,
It
divides
le?

operand
with
the
right
operand
and
assign
the
result

to
le?
operand

C
/=
A
is
equivalent
to
C
=
C
/
A

%=

Modulus
AND
assignment
operator,
It
takes

modulus
using
two
operands
and
assign
the
result
to

le?
operand

C
%=
A
is
equivalent
to
C
=
C
%
A

int a , b , c ;
a = 10 ;
b = 20 ;
c = 0 ;
c = a + b ;
System.out.println (c) ;
}
010101010101010101010101

30

a = 10 b = 20 c = 0

int a , b , c ;
a = 10 ;
b = 20 ;
c = 0 ;
c + = a ;
}
010101010101010101010101

10

a = 10 b = 20 c = 0

int a , b , c ;
a = 10 ;
b = 20 ;
c = 0 ;
c - = a ;
}
010101010101010101010101

-10

a = 10 b = 20 c = 0

int a , b , c ;
a = 10 ;
b = 20 ;
c = 0 ;
c*=a ;
}
010101010101010101010101

0

a = 10 b = 20 c = 0

int a , b , c ;
a = 10 ;
b = 20 ;
c = 0 ;
c/=a ;
}
010101010101010101010101

0

a = 10 b = 20 c = 0

int a , b , c ;
a = 10 ;
b = 20 ;
c = 0 ;
c%=a ;
}
010101010101010101010101

0

a = 10 b = 20 c = 0

Assignment
.٢٥ ، ٢٠ ، ٣٠ : ‫التالية‬ ‫الدرجات‬ ‫مجموع‬ ‫بحساب‬ ‫يقوم‬ ‫برنامج‬ ‫ أكتب‬ -
. ٧/٢ : ‫قسمة‬ ‫باقي‬ ‫بمعرفة‬ ‫يقوم‬ ‫برنامج‬ ‫ أكتب‬ -
. ‫راسب‬ ‫او‬ ‫ناجح‬ ‫الطالب‬ ‫كان‬ ‫إذا‬ ‫بمعرفة‬ ‫يقوم‬ ‫برنامج‬ ‫ أكتب‬ -
) ‫قيمة‬ ‫بطباعة‬ ‫يقوم‬ ‫برنامج‬ ‫ أكتب‬ -X. ‫الذاكرة‬ ‫في‬ (١ ) ‫بــ‬ ‫القيمة‬ ‫هذه‬ ‫تزويد‬ ‫ذلك‬ ‫بعد‬ ‫ثم‬ ً ‫اوال‬ (
) ‫قيمة‬ ‫بنقص‬ ‫يقوم‬ ‫برنامج‬ ‫ أكتب‬ -A) ‫قيمة‬ ‫طباعة‬ ‫ذلك‬ ‫بعد‬ ‫ثم‬ ، ‫الذاكرة‬ ‫من‬ (١) ‫بـ‬ (A. (
) ‫بطباعة‬ ‫يقوم‬ ‫برنامج‬ ‫ اكتب‬ -Excellent)‫وطباعة‬ (٩٠ =< X ) ‫كان‬ ‫إذا‬ (Very Good‫(إذا‬
) ‫وطباعة‬ ( ٨٠ =< X ) ‫كان‬Good) ‫وطباعـــــــــــــــة‬ (٥٠ =< X ) ‫كان‬ ‫(إذا‬Fail‫إذا‬ (
.(٥٠ => X ) ‫كان‬

Java 2

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