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MindMap Gallery Self-study notes on Java programming algorithm structure statement knowledge points

Self-study notes on Java programming algorithm structure statement knowledge points

Self-study notes on Java programming algorithm structure statement knowledge points: Basic computer knowledge: Types of computers: desktop computers, notebook computers, server computers.

Edited at 2022-11-22 13:39:50

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Self-study notes on Java programming algorithm structure statement knowledge points

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Outline

Java programming basics
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Self-study notes on Java programming algorithm structure statement knowledge points

Basic computer knowledge

Type of computer

desktop computer

notebook computer

server computer

hardware

For example: hard drive, monitor, motherboard

software

system software

For example: Windwos\linux\unix\mac

application

For example: QQ, Kuaibo, Baidu Video, Thunder, eDonkey

DOS commands

dir: directory

cls: clear screen

cd: Enter the directory

cd..: Return to the previous directory

cd/: Return to the root directory

md: create directory

rd: delete directory

del: Delete files

exit: exit

Computer Languages

The language used to communicate between humans and computers

java language

c language

Basic knowledge of Java

Java language introduction

object-oriented language

Sun later orcale

Characteristics of Java language

Object-oriented thinking programming

cross-platform

Safety

JDK, JRE, JVM

JDK: development environment

used to write java code

JRE: Runtime environment

Used to run developed java code

JVM: java virtual machine

JVM is not cross-platform

Download, install and uninstall JDK

download

Download from the official website

java.sun.com

www.orcale.com

Search online

Install

uninstall

Control Panel--Programs

Configure path environment variable

ConfigureJavaHome

JAVA_HOME = Directory

Modify path

%JAVA_HOME%\bin;.....

Case: HelloWorld

Create java file

Create class

Write main method

Console output printing

Identifier

Keywords

Comment

Single line comments

Multi-line comments

Documentation comments

Can be used to generate help documentation in web format

constant

Representation of signed numbers

Original code

reverse code

complement

base

binary

Conversion between binary and decimal

Octal

Conversion between octal and decimal

hexadecimal

Conversion between hexadecimal and decimal

Conversion skills between base systems

binary to octal

Three-digit combination, the left side is not enough to add 0

binary to hexadecimal

Four-digit combination, there is not enough left to add 0

type of data

Basic data types

integer type

byte

short

int

long

floating point type

float

double

Character type

char

Boolean type

boolean

Reference data type

array

kind

interface

variable

concept

The amount that changes within a specified range during program execution

Format

Data type variable name = initial value;

Conversion between data types

implicit conversion

It’s automatic type promotion

Data types with small capacity are automatically converted to data types with large capacity.

cast

A data type with a large capacity is forced to a data type with a small capacity.

Format

(Converted data type) Data that needs to be converted

operator

arithmetic operators

% remainder operator

, --operator

Use first and add later

Add first and then use

assignment operator

The left side of the operator must be a variable

=: Comes with forced conversion function

comparison operator

=: Assignment operator

==: comparison operator

The result is of type Boolean

Logical Operators

AND operator

False then false

Short circuit and &&

&&: The left side is FALSE. If you don’t read it later, the result is false.

or operator

What is true is true

Short circuit or ||

||: left back TRUE, do not read later, the result is TRUE

XOR operator

If they are the same, they are false; if they are different, they are true.

Not operator

Negate

ternary operator

Format

(Condition)? Expression1:Expression2;

Bit operators

Bit AND

bit or

Bit XOR

one's complement

Shift left

Move right

unsigned right shift

structural statement

judgment structure

Format

Select structure

switch

Format

Loop structure

while

Format

do...while

Format

for

Format

Nested loops

forfor nesting

equilateral triangle

The change of the conditional expression of the inner loop is the same as the change of increment x of the outer loop

99 multiplication table

inverted triangle

The initial value expression of the memory loop changes the same as the increment x of the outer loop.

function

Why use functions

Improve code reusability

Format

Modifier return value type function name (parameter list) {......}

Type of function

No return value

void

with return value

Basic data types

Reference data type

Defining functions clearly

Data type of return value

Whether there is unknown content involved (parameter list)

function overloading

concept

In a class, there are multiple methods with the same name but different parameter lists

Characteristics of determining whether it is function overloading

Names must be the same

Regardless of return value type

Parameter list is different

The number of parameters is different

different data types

Data types are in different order

array

concept

Containers that can store multiple data of the same data type

Features

in heap memory

The array will automatically number the elements starting from 0 (subscript)

First address value

Elements have default values

integer

decimal

0.0

character

'\u0000', the display effect is equivalent to a space

Boolean

false

Reference data type

null

Format

Case

Array traversal

The maximum value of the array

Array search

Parameter passing in java

Basic data types

Changes in formal parameters have no effect on actual parameters

Reference data type

Changes in formal parameters have an impact on actual parameters

Look-up table method

Multidimensional Arrays

concept

The elements in the array are arrays

three formats

Case

Traverse

cumulative sum