Identificadores
Na linguagem Java um identificador é startado com uma letra, undersco ( _ ), ou sinal de dólar ($), e existe uma diferenciação entre letras maiúsculas e minúsculas:
Identificadores válidos:
* identifier
* userName
* User_name
* _sys_var1
*$change
Tipos Básicos no Java
No Java existem oitos tipos básicos e um tipo especial.
Tipo Lógico
- boolean: on e off; true e false ou yes e no.
Tipo Textual
- char e String
Um caracter simples usa a representação do tipo char. O tipo char representa na forma Unicode um caracter de 16-bit.
O literal do tipo char pode ser representado com o uso do (‘ ‘).
‘\n’ – nova linha
‘\r’ – enter
‘\u????’ – especifica um caracter Unicode o qual é representado na forma Hexadecimal.
‘\t’ – tabulação
‘\\’ - \
‘\” ”’ - “”
O tipo String, como não é primitivo, é usado para representar uma seqüência de caracteres.
Palavras Reservadas
abstract do implements private throw
boolean double import protected throws breaak else instanceof public transient byte extends int return true
case false interface short try catch final long static void char finally native super volatile
class float new switch while continue for null synchronized
default if package this
Tipo Integral – byte, short, int e long
Existem quatro tipos de integral:
Tamanho da Integral Nome ou Tipo Espaço
8 bits byte -27 . . . . 27 - 1
16 bits short -215 . . . . 215 - 1
32 bits int -231 . . . . 231 - 1
64 bits long -263 . . . . 263 - 1
Tipo Ponto Flutuante
Uma variável do tipo ponto flutante pode ser declarada usando a palavar float ou double.
3.14 Um ponto flutuante simples;
6.02E23 Um valor de ponto flutuante largo;
2.718F Um valor de ponto flutuante simples;
123.4E+306D Um valor de ponto flutuante usando o tipo double.
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