1. The basic usage of arithmetic operators!

What is operator
symbols constant and variable operating called operators
Operator classification
arithmetic operators + , - , * , / , % , ++ , --
assignment operators =， +=,-=,*=,/=,%=
Comparison Operators > < >= <= == != instanceof
Logical Operators && || !
Bitwise & | ^ ~ >> << >>>
ternary operator?:
Precautions:
a: integer division can only get integer. If you want a decimal, use floating-point
b: / acquired business is,% acquisition of the remainder of the division is operating division operation
symbol% result of the operation, depending on the symbol on the left is involved in computing

2. Arithmetic operators ++ and - - Usage!

++ - operator effect
from plus (+) from the minus (-) operation
+: increase since. The original data + 1
-: decrement. The original data -1
Demo Case
a: alone:
in front of and behind the same effect as the operand.
B: Use involved in computing:
in front of the operands, the first increment or decrement, and then participate in operation.
Operand placed behind the first operation involved in, and then increment or decrement.


	int a = 10;
	int b = 10;
	int c = 10;

	a = b++;
	c = --a;
	b = ++a;
	a = c--;
	
	/*结果
	a=9
	b=10
	c=8*/

	
	int x = 4;
	int y = (x++) + (++x) + (x*10);
	
	//x=6 , y=70

3. Basic use of the assignment operator!

A:赋值运算符有哪些
	=， +=,-=,*=,/=,%=
注意事项：
	a:基本的赋值运算符：=
		把=右边的数据赋值给左边。
		
	b:扩展的赋值运算符：+=,-=,*=,/=,%=
		+= 把左边和右边做加法，然后赋值给左边。
	c: 赋值运算符要求左边的数据必须是一个变量

4. The basic usage of relational operators and Notes

A:关系运算符有哪些
	== ,!= , < , > , <= , >= , instanceof(后面讲解)
注意事项：
	无论你的操作是简单还是复杂，结果是boolean类型。
	"=="不能写成"="。

The basic use of logical operators

A:逻辑运算符有哪些
	&(并且) , |(或者) , !(非) , ^(异或) , &&(短路与) , ||(短路或)
注意事项：
	a:逻辑运算符一般用于连接boolean类型的表达式或者值。
		在Java中我们要表示一个数大于3并且小于6 ，不可以写成3<x<6，应该写成 x>3 & x<6 。
	b:表达式：就是用运算符把常量或者变量连接起来的符合java语法的式子。
		算术表达式：a + b
		关系表达式：a == b
B:结论：
	&逻辑与:有false则false。
	|逻辑或:有true则true。
	^逻辑异或:相同为false，不同为true。
		举例：情侣关系。男男,男女,女男,女女
	!逻辑非:非false则true，非true则false。
		特点：偶数个不改变本身。

6. The logical operators && and & distinction

A:案例演示
	&&和&的区别?
		a:最终结果一样。
		b:&&具有短路效果。左边是false，右边不执行。
B:同理||和|的区别
C:开发中常用
	&&,||,!

7. The basic usage bitwise operator

What bitwise
& (and), | (or), ^ (exclusive or) ~ (bitwise), << (shift left), >> (shift right), >>> (unsigned Right shift)
Note: bit operation is carried out directly on the two's complement arithmetic.

Usage 1

&:有0则0
|:有1则1
^:相同则0，不同则1
~:按位取反 0变1 1变0
^ Features: a different data is another data bit or two, the number itself is not altered

Usage 2

<<:左移空位补0，被移除的高位丢弃。
>>:右移被移位的二进制最高位是0，右移后，空缺位补0；最高位是1，高位补1。
>>>:无符号右移被移位二进制最高位无论是0或者是1，空缺位都用0补。
Example:
<<: the left << data by, for example, the mobile power of 2 << 3 10 10 Results 2 ^ 3 = 80 *
>>: the data by moving to the left >> power of 2, for example, 40> > 40 results 3/2 ^ 3 = 5

8. The basic usage of the ternary operator

Three yuan (trinocular) operators format
(relational expression)? Expression 1: Expression 2;
```
int a=(10>20)?30:50;
// a=50
```
Ternary operator implementation process
calculated relational expressions, if true, the result of the operation is the expression 1;
if false, the result of operation is the expression 2;