Java Data types

Data type: 1): Basic data type: Byte, short, int, long, float, double, char, Boolean

2): Reference data type: Array, class, interface.

Level from low to High: Byte,char,short (these three levels)-->int-->float-->long-->double

Automatic type conversion: from low to high level, the system automatically turn;
Coercion type conversions: What is the use of?

Assign a high-level number to a variable with a low rank for that number;

Operation symbol: 1), arithmetic operator.
+-*/%: Any integer modulus 2 is not 0 is 1, so as long as the change is the module can be implemented switch operation.   +: Connector. ++,--

2), assignment operator.
=  += -= *= /= %=

3), comparison operator.
Features: This operator is characterized by the result of the operation, either True or false. 4), logical operator.
& |   ^  ! && | |
Logical operator except!   are used to concatenate two Boolean expressions. &: Only both sides are true and the result is true. Otherwise it is false. |: If both sides are false the result is false, otherwise it is true ^: xor: And or a little different.
On both sides, the result is false.

It is true that the results are different on both sides.

& and && difference: &: Whatever the left result is, the right side is involved in the operation.
&&: Short-circuit and, if the left is false, then the right-hand parameter and operation. | and | | Difference: |: Both sides are calculated.
||  : Short circuit or, if the left is true, then the right side does not participate in the operation.   5), bitwise operator: operator used to manipulate bits.  & | ^
<< >> >>> (unsigned Right shift)

Java Data types