/ *
The Java data types defined
a variable according to the data type;
basic data types;
Integer: byte short int long
float float double
type char
Boolean: boolean
The Java data types defined
a variable according to the data type;
basic data types;
Integer: byte short int long
float float double
type char
Boolean: boolean
Reference data type
classes (class)
the interface (interface)
array (Array)
classes (class)
the interface (interface)
array (Array)
Second, the position variables declared in the class
member variable vs local variables
* /
class VariableTest1
{
public static void main (String [] args)
{
// Integer: byte (1 byte = 8bit) short (2 bytes) int (4 bytes) long (8 bytes)
// byte range of 127 ~ -128
byte B1 = 12 is;
byte B2 = -128;
// B2 = 128; // not compiled by
System.out.println (b1);
System.out.println (B2);
// declare variables must be long to "1" or "L" end
// int type using normal integer variable is defined
Short S1 = 128;
int I1 = 1234;
long L1 = 323232323L ;
System.out.println (L1);
. 2 // float float (4 byte) double (8 bytes)
// float value represented with a decimal point
// range of values represented by a float is larger than the long
member variable vs local variables
* /
class VariableTest1
{
public static void main (String [] args)
{
// Integer: byte (1 byte = 8bit) short (2 bytes) int (4 bytes) long (8 bytes)
// byte range of 127 ~ -128
byte B1 = 12 is;
byte B2 = -128;
// B2 = 128; // not compiled by
System.out.println (b1);
System.out.println (B2);
// declare variables must be long to "1" or "L" end
// int type using normal integer variable is defined
Short S1 = 128;
int I1 = 1234;
long L1 = 323232323L ;
System.out.println (L1);
. 2 // float float (4 byte) double (8 bytes)
// float value represented with a decimal point
// range of values represented by a float is larger than the long
D1 = 123.3 Double;
System.out.println (D1 +. 1);
// the definitions float type variables, variables to "f" or "F" end
System.out.println (D1 +. 1);
// the definitions float type variables, variables to "f" or "F" end
F1 = 12.3F a float;
System.out.println (F1);
// normal floating-point variables define a double
System.out.println (F1);
// normal floating-point variables define a double
// 3 char char (1 = 2-byte character)
// char type variable is defined using a pair of generally 'only internal write a character
char C1 =' A ';
C1 =' A ';
// not compiled by
// C1 = 'AB';
System.out.println (C1);
char = C2 '. 1';
char = C3 'in';
char C4 = 'mi fa';
System.out.println (C2);
the System. Out.println (C3);
System.out.println (C4);
// char type variable is defined using a pair of generally 'only internal write a character
char C1 =' A ';
C1 =' A ';
// not compiled by
// C1 = 'AB';
System.out.println (C1);
char = C2 '. 1';
char = C3 'in';
char C4 = 'mi fa';
System.out.println (C2);
the System. Out.println (C3);
System.out.println (C4);
// declare a character representation 1. 2. 3.Unicode escape character values to represent character constant
char c5 = '\ n'; // newline
c5 = '\ t'; // tabs
System.out .print ( "Hello" + C5);
System.out.println ( "World");
char C6 = '\ u0043';
System.out.println (C6);
char c5 = '\ n'; // newline
c5 = '\ t'; // tabs
System.out .print ( "Hello" + C5);
System.out.println ( "World");
char C6 = '\ u0043';
System.out.println (C6);
}
}
}