4. Operator & Assignment

8/12/2019 4. Operator & Assignment

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Topik

Unary operator

Arithmetic operator Shift operator: , dan >>> Comparison operator

Bitwise operator: &, , dan |. Short Circuit operator Conditional operator : ? Assignment operator Operator lain : new, instance of Urutan pemrosesan


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The Unary Operators 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 : !5. Cast : ()


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The Unary Operators: ++ dan - -


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The Unary Operators: + dan -1. X = -3;

2. Y = +3;

3. Z = -(Y+6);


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The Unary Operators The Bitwise Inversion Operator: ~

converting all the 1 bits in a binary value to 0s and allthe 0 bits to 1s.Example:00001111 11110000

The Boolean Complement Operator: ! inverts the value of a boolean expression.Example:

! t rue f al se! f al se t rue


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The Arithmetic Operators The Multiplication and Division Operators: * and /

multiply or divide two integers, the result will be calculated using integerarithmetic in either int or long representation. Issues:

Loses precision.i nt x = 7;i nt y = 4;i nt r esul t = x/ y;

The result will be bigger than the maximum number (overflow)byt e x = 64;byt e y = 4;byt e r esul t = x*y;


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The Modulo Operator: % Adalah sisa pembagian Bisa diaplikasikan pada:

Bilangan integer

Bilangan floating - point

Example:x = 7 % 4; / / so x = 3y = 7. 6 % 2. 9; / / so y = 1. 8


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The Addition and SubtractionOperators: + and -

Digunakan untuk melakukan operasipenambahan dan pengurangan.

Concatenation + bisa juga

digunakan untuk menggabungkan 2 string


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Arithmetic Error Conditions Integer division by zero ( ArithmeticException)

Floating-point calculations represent out-of-range values using the IEEE 754 infinity, minusinfinity, and Not a Number (NaN) values.

Overflow


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The Shift Operators: Shift operator:

> : sign right shift

>>> : unsigned right shift Fundamentals of Shifting

moving the bit pattern left or right.

applied to arguments of integral types only. Pada operator >>: Nilai bit yang baruadalah 0

Pada operator >> : Nilai bit yang barutergantung pada bit yang akan digeser, jikanilainya : 1 negatif, maka nilai baru adalah 1 0 positif, maka nilai baru adalah 0


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Operator >>>


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The Comparison Operators Menghasilakn boolean result. Yang termasuk comparison operator:

Ordinal comparison: =

Theinstanceof

Operator Tests the class of an object at runtime. The Equality Comparison Operators: ==

and !=Test for equality and inequality, respectively,returning a boolean value.


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Ordinal comparisoni nt p = 9;i nt q = 65;i nt r = 12;f l oat f = 9. 0f ;char c = A ;

Ber i kut i ni akan menghasi l kan t r ue:p < qf < qf rc >= q


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Operator instanceof Operator instance of digunakan untuk mengecek class suatu obyek.

Pengecekan dilakukan pada saat runtime.i mpor t j ava. awt . *;

cl ass Compar eTest {

publ i c st at i c voi d mai n( St r i ng [ ] ar gs) {

But t on b = new But t on( Exi t ) ;

bool ean compar e1 = b i nst anceof But t on;

bool ean compar e2 = b i nst anceof Componenet ;

Syst em. out . pr i nt l n( I s b a But t on? + compar e1)

Syst em. out . pr i nt l n( I s b a Component ? + compar e2)

}

}


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Operator instanceof Hasil:

I s b a But t on? t r ue

I s b a Component ? t r ue

Argumen sebelah kiri adalah object referenceexpression.

Argumen sebelah kanan adalah class, interface, atauarray


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Equality operators Equality can be tested with the operators

equals and not equals:= = equals!= not equals

There are four different types of entitiesthat can be tested:

Numbers Characters Boolean primitives Reference variables to object


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Equality for Primitivesclass 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);

}}


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The Bitwise Operators: &, ^, and | Provide logical AND, OR and XOR operations

on integral data types.


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|

|


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Binary Operators: &, |, and ^ AND, OR and XOR operations on logical data types. Semua operan akan dieksekusi.

Operator & True & True = True True & False = False False & True = False False & False = False

Operator | True & True = True True & False = True False & True = True False & False = False

Operator True & True = False True & False = True False & True = True False & False = False


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The Short-Circuit Logical Operators Operators && and || Applicable only to boolean values and not integral

types. For an AND operation, if one operand is false, the

result is false, without regard to the other operand.

For an OR operation, if one operand is true, the resultis true, without regard to the other operand.

Jadi, untuk nilai boolean x:

false && X = false true || X = true


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The Conditional Operator: ?: known as the ternary operator takes three operands code simple conditions (if/else) into a single expression.

Example:a = x ? b : c;

Aturan: Tipe data b, c dan a sebaiknya sama. Jika tidak sama? Terjadipromosi

Tipe ekspresi x harus boolean Contoh nilai x (6>7) Jika ekspresi x benar maka akan menghasilkan b Jika ekspresi x salah maka akan menghasilkan c


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The Assignment Operators set the value of a variable or expression to

a new value. Example:1. byt e x = 2;2. x += 3;3. a = b = c = 0; / / l egal .


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Operators Precedence


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Operators Precedence (cont.)


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Evaluation Order 1. i nt [ ] a = { 4, 4 };

2. i nt b = 1;3. a[ b] = b = 0;

Not e: unt uk assi gnment ber l akuat ur an asosi at i f dar i kanan kek i r i .

1. a[ b] a[ 1]2. b = 03. a[ 1] = 0

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