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Java constants

The Java constants used to use values \u200b\u200b data types that will be constant during program execution, unlike variables that can be modified at any time.

Once assigned to a constant value, it can not be changed later.

is not necessary to start the value of a constant declaration time, but once you assign a value to that constant, this value can not be modified.

The name that identifies a constant identifier is called .
To declare a constant using the keyword final , then define the data type and then writes the identifier of the constant.


DECLARE CONSTANT NOT STARTED

final type identifier;

 
 final int age; 
 

declare several constants
NOT STARTED

final identificador1 type, identificador2 .. , IdentificadorN;

 
 final float a, b, c; 
 

AND BEGIN DECLARE AT A TIME CONSTANT

final type identifier = value;

 final 
 double size = 1.72; 
 

MULTIPLE CONSTANT AND BEGIN DECLARE BOTH

final identificador1 type = value1, value2 = identificador2 ... , IdentificadorN = valueN;

 
 final boolean a = true, b = false, c = false; 
 

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A comment is a message that is written somewhere in our program, with the intention of explaining fuente.Podemos use code to explain the task to carry out a method, variable, etc.

In Java there are three kinds of comments:


1) Review of a single line

The comment written following a double slash ( / / ).

 
 / / this is a one line comment 
 

2) multi-line comment

The commentary is written in characters / * and * / .

 
 / * this is a comment 
 
 
 several lines * / 
 

3) Review the documentation included in

The commentary is written in characters / ** and * / .
This type of comment is a special type used to generate javadoc documentation about the program.

 
 / ** 
 
 this is a comment that comes in the javadoc documentation 
 
 * / 
 

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Comments Reserved Words in Java Java Java Identifiers

also known as keywords are used by the language and can not be used to name an identifier .

Java reserved words are:


abstract boolean break


byte case catch


const char

class continue default

else do
double


extends false final

finally


float for goto if


import implements


instanceof int interface long


native new null


package private protected


return
public static short

strictfp

super switch synchronized


this
throw throws transient


true try void


volatile while

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An identifier is a name that represents a variable, method, class, interface of a program.

Syntax of a Java identifier

to form an identifier, we must consider the following rules:

1) must consist of only letters, digits or other characters allowed (may be the dollar sign: $ or the underscore character: _ ).

2) The first character must be a letter, dollar sign or underscore character.

3) You can use a Java reserved word to denote an identifier.

4) To capitalize a letter Java is different from that letter in lower case, for example, the ID number is different ID NUMBER .


Valid IDs

number
$ variable1
another $ patient _el4alumno




invalid identifiers

2alumno
/ variable sum value%

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The Java variables representing memory spaces are reserved for storing the value of a type data.
The value of a variable may be modified during the execution of a program.
The name that identifies a variable called ID .


variable declaration in Java

A variable is declared as follows:
type identifier;
can also
declare multiple variables of the same type of data at once, as follows: type

identificador1, identificador2, identificadorN;



INITIATION OF VARIABLES IN JAVA

All variables we have declared our program, we must initiate , ie assign an initial value, which can modify it later, according to our needs, to avoid possible error messages.

to declare variables as attributes of the class, are initiated by the Java compiler, the other not.

A variable is initiated as follows:

identifier = value; (you must declare the variable represented by ID)

also can be started multiple variables of the same type of data at once (the variables are declared and undertaken at the same time), as follows:

identificador1 type = value1, value2 = identificador2 .. , N identificadorN = value;

then shows how to declare and initiate variables at once, the various Java data types (variables can be declared not start, but not recommended)

type variables byte byte

 
 b = 0; 
 

Variables of type short

 
 short a =- 100, b = 200; 
 

Variables int

 
 int a =- 3000; 
 int b = 558; 
 

Variables of type long

 
 long a = 2505L, / * indicates that the constant 2505 is long * / 
 long b = 13; 
 long c = 0xd / * hexadecimal value equivalent to 13 in decimal * / 
 

Variables of type float

 
 float a = 2.5478; 
 float b = 254.78e-2; 
 / / value of b is equal to the value of a 
 
 float c = 4/5f; 
 / / with f indicate 5 which is a float, it is necessary to indicate 
 / / that at least one of the two values \u200b\u200bof the division is 
 / / a float, otherwise, the result will not be the expected * / 
 
 float d = 4f / 5; 
 / * gives the same result as above * / 
 

Variables of type double double

 
 a = 4.5478; 
 double b = 4.5478D; 
 double c = 3D / 4; 
 double d = 3/4D; 
 

boolean variables

 
 boolean a = true; 
 boolean b = false; 
 

Variables char

 
 / / variables declared to below have the same value. AKEY 
 char = 'a'; 
 AKEY char = 97, / * letter 'a' in decimal (ASCII) * / char 
 AKEY = 0x0061, / * letter 'a' in hexadecimal * / 
 

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Variables in Java Java Data Types in Object-Oriented Programming

The

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The object-oriented programming (OOP) is a programming model that uses objects and their relationships for designing applications and software.



OBJECTS An object is an abstraction of some fact or real-world entity has:
a) attributes representing its characteristics or properties and
b) methods that represent behavior or actions they perform.

All attributes and methods common objects are grouped into classes.

A CLASS

class equals the generalization of a specific type of objects, ie a class is a template to create multiple objects with similar characteristics, so it is said that an object is an instance of a class .

Imagine a mold for making jelly, then the mold is the class, and the gels are objects. Example



class
An example would be the Person class, which can be defined by attributes and methods.

attributes of the class Person can be: Name


_ _ _
Age Sex Nationality
_

The methods Person class can be: Eat

_ _
Sleep Study

_ _ Work

After defining the class (template) Person can begin to create instances (objects) of this class.

Each object created will then have the attributes of the class Person (Name, Age, Sex, Nationality) and methods of the class Person (Eat, Sleep, Study, Work).

Objects created in a program to communicate with each other through messages .


POO CHARACTERS



Abstraction The abstraction allows us to focus on more important and relevant aspects of things to get an overview of a problem, leaving aside the specifics.

Encapsulation means gathering

all elements that can be considered within the same entity, the same level of abstraction. This increases the cohesion of the system components. Heritage



The object-oriented programming to define classes in terms of other classes, for it is considered a class hierarchy where each class has a superclass
(the upper class in the hierarchy) and each Superclass may have one or more subclasses (lower classes in the hierarchy).

The term had significantly inherit a subclass has all the attributes (properties) and methods of its superclass. Polymorphism



Using polymorphism, you can implement multiple forms of the same method within a clase.Debido this, you can access different methods with the same name.

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