Index of /Prakt_PJK

O

BJECT

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RIENTED

O

BJECT

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RIENTED

P

ROGRAMMING

Day 3 :

TOPIK

M b d k t i t d l l i b l

| Membedakan antara instance dan local variabel.

| Urutan pemrosesan

| Unary operator

| Unary operator

| Arithmetic operator

| Shift operator: <<, >>, dan >>>

| Comparison operator

| Bitwise operator: &, ^, dan |.

Sh t Ci it t

| Short – Circuit operator

| Conditional operator : ?

| Assignment operator

| Assignment operator

E

VALUATION

O

RDER

1 i t [] { 4 4 }

1. int [] a = { 4, 4 }; 2. int b = 1;

3. a[b] = b = 0; 3. a[b] b 0;

Note: untuk assignment berlaku

aturan asosiatif Æ dari kanan ke

aturan asosiatif Æ dari kanan ke

kiri.

1. a[b] Æ a[1] 2. b = 0

T

HE

U

NARY

O

PERATORS

| Dibutuhkan hanya satu operan.

1. Operator increment dan decrement : ++ dan

-2. Operator unary plus dan minus : + dan –

3. Operator bitwise inversion : ~

4. Operator boolean complement : !

-T

HE

U

NARY

O

PERATORS

: +

DAN

-1. X = -3;

2 Y + 3; 2. Y = + 3;

T

HE

U

NARY

O

PERATORS

Th Bit i I i O t

| The Bitwise Inversion Operator: ~

y converting all the 1 bits in a binary value to 0s and all the 0 bits to 1s.

E l

Example:

00001111 Æ 11110000

| The Boolean Complement Operator: !

| The Boolean Complement Operator: !

y inverts the value of a boolean expression.

Example:

Æ

M

ENCARI NILAI BINER SUATU BILANGAN NEGATIF

| Tulis biner positifnya

| Kurangi dengan 1

| Kurangi dengan 1

M

ENCARI NILAI DESIMAL SUATU BILANGAN BINER NEGATIF

| Negasikan bilangan biner tersebut

T

HE

U

NARY

O

PERATORS

:

CAST

Æ

(

TYPE

)

| Casting digunakan untuk melakukan konversi tipe secara eksplisit ke dalam type baru yang ada dalam tanda ()

dalam tanda ().

| Akan dilakukan pengecekan tipe terlebih dahulu.

| Contoh:

| Contoh:

T

HE

U

NARY

O

PERATORS

:

CAST

Æ

(

TYPE

)

| Bisa diaplikasikan pada tipe obyek.

1. Vector v = new Vector();

2. v.add(“Hello”);

T

HE

A

RITHMETIC

O

PERATORS

| The Multiplication and Division Operators: * and /p p

y multiply or divide two integers, the result will be

calculated using integer arithmetic in either int or long representation.

y Issues:

| Loses precision. int x = 7; int y = 4;

int result = x/ y;

| The result will be bigger than the maximum number

(overflow) (overflow)

byte x = 64; byte y = 4;

T

HE

M

ODULO

O

PERATOR

: %

| Adalah sisa pembagian

| Bisa diaplikasikan pada:

y Bilangan integer

y Bilangan floating - point

Example:

7 % 4 // 3

x = 7 % 4; //so x = 3

T

HE

A

DDITION AND

S

UBTRACTION

O

PERATORS

: +

AND

-| Digunakan untuk melakukan operasi penambahan dan pengurangan.

C t ti Æ + Æ bi j di k t k

A

RITHMETIC

E

RROR

C

ONDITIONS

| Integer division by zero ( ArithmeticException)

| Floating-point calculations represent l i th IEEE 754 i fi it i

range values using the IEEE 754 infinity, minus infinity, and Not a Number (NaN) values.

| Overflow

T

HE

S

HIFT

O

PERATORS

:

| Shift operator:p

y << : left shift

y >> : sign right shift

y >>> : unsigned right shift

y >>> : unsigned right shift

| Fundamentals of Shifting

y moving the bit pattern left or right.

li d f i l l

y applied to arguments of integral types only.

| Pada operator << dan >>>: Nilai bit yang baru adalah 0

| Pada operator >> : Nilai bit yang baru

tergantung pada bit yang akan digeser, jika nilainya :

nilainya :

y 1 Æ negatif, maka nilai baru adalah 1

T

HE

C

OMPARISON

O

PERATORS

| Menghasilakn boolean result

| Menghasilakn boolean result.

| Yang termasuk comparison operator:

y Ordinal comparison: < <= > >=

y Ordinal comparison: <, <=, >, >=

y The instanceof Operator

Tests the class of an object at runtime. Tests the class of an object at runtime.

y The Equality Comparison Operators: == and !=

Test for equality and inequality, respectively, returning a b l l

O

RDINAL COMPARISON

i t 9

int p = 9; int q = 65; int r = 12; int r 12;

float f = 9.0f; char c = ‘A’;

Berikut ini akan menghasilkan true: <

O

PERATOR INSTANCEOF

•

Operator instance of digunakan untuk mengecek

•

Operator instance of digunakan untuk mengecek

class suatu obyek.

O

PERATOR INSTANCEOF

• Hasil:

Is b a Button? true

Is b a Component? true

• Argumen sebelah kiri adalah object reference expression.

E

QUALITY OPERATORS

y Equality can be tested with the operators equals and not equals:

= = Æ l

◦ = = Æ equals

◦ != Æ not equals

y There are four different types of entities that can

y There are four different types of entities that can be tested:

◦ Numbers

◦ Characters

◦ Boolean primitives

E

QUALITY FOR

P

RIMITIVES

class ComparePrimitives{

public static void main(String [] args) { System.out.println(‘a’ ==‘a’);

System.out.println(‘a’ ==‘b’); System.out.println(5 != 6);

System.out.println(5.0 == 5L); System.out.println(true==false); }

E

QUALITY FOR

R

EFERENCE

V

ARIABLES

import java.awt.Button; class CompareReference {

public static void main(String [] args) { Button a = new Button(“Exit”);

Button b = new Button(“Exit”); Button c = a;

System.out.println(a==b); System.out.println(a==c); }

T

HE

B

ITWISE

O

PERATORS

:

&

, ^,

AND

|

P id l i l AND OR d XOR ti

T

HE

S

HORT

-C

IRCUIT

L

OGICAL

O

PERATORS

O t && d ||

y Operators && and ||

y Applicable only to boolean values and not integral types.

y For an AND operation, if one operand is false, the result p , p , is false, without regard to the other operand.

y For an OR operation, if one operand is true, the result is true, without regard to the other operand., g p

|Jadi, untuk nilai boolean x:

y false && X = false

T

HE

C

ONDITIONAL

O

PERATOR

:

?:

| known as the ternary operator

| known as the ternary operator

| takes three operands

| code simple conditions (if/else) into a single

| code simple conditions (if/else) into a single expression.

| Example:

a = x ? b : c;

| Aturan:

y Tipe data b dan c harus sama dengan tipe data a

y Tipe data b dan c harus sama dengan tipe data a

y Tipe ekspresi x harus boolean

y Jika ekspresi x benar maka akan menghasilkan b

T

HE

A

SSIGNMENT

O

PERATORS

| set the value of a variable or expression to a new value.

E l

| Example:

1. byte x = 2;

2 3

2. x += 3;