Java modifiers and basic operators

Java modifiers can be divided into two types

• Accessible modifiers
• Non-accessible modifiers

Using modifiers, you can use the definition of the class, method, variable

Accessible modifiers

• Package visible, default, no modifiers required
• Can only be visible by class (private)
• All visible (public)
• Can only be visible to the current package and all classes (protected)

Non-accessible control characters

• static modifier for creating class methods and variables Statics
• Final modifier for completing class, method, and variable implementations final
• Abstract modifier for creating abstract classes and methods
• The synchronized and volatile modifiers are used for threading.

Java operators

• Arithmetic Operators (arithmetic operator)
• Relational Operators (relational operator)
• Bitwise Operators (bitwise operator)
• Logical Operators (logical operator)
• Assignment Operators (Assignment operator)
• Misc Operators (Other operators)

算术运算符- +- -- *- /- % （模）- ++- --

关系运算符- == - ！=- >- <- <=- >=

Bitwise operators

a = 0011 1100b = 0000 1101a&b = 0000 1100(与，都为1为true)a|b = 0011 1101（或，有1就是true）a^b = 0011 0001（异或，不同就是true）~a  = 1100 0011（取反）a<<2 左移扩大 1111 0000a>>2 右移缩小0000 1111

logical operators

- A && B 都真为真- A||B有真为真- ！A 取反

Assignment operators

- =- +=- -=- *=- /=- %=- >>=- &=- ^=- |=

Ternary operators

- varible x =(expression)?value if true:value if false

instanceof

( Object reference variable ) instanceof  (class/interface type)

public class Test {   public static void main(String args[]) {      String name = "James";      // following will return true since name is type of String      boolean result = name instanceof String;      System.out.println( result );   }}

Priority table

Java modifiers and basic operators