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Java

Java SE DK

Download from

http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

Java SE Development Kit 8u121

Java SE Development Kit 8u121 Demos and Samples

x86 version

Install

開発ツールを選択

開発ガイド

http://docs.oracle.com/javase/8/docs/

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Tutorial

hello world in Windows

http://docs.oracle.com/javase/tutorial/getStarted/cupojava/win32.html

command prompt

C:\Users\a_mizuno\Desktop\Work\Java>

% javac HelloWorldApp.java

=> HelloWorldApp.class is generated

% java -cp . HelloWorldApp

Java のアプリケーションには main method が必要

public static void main(String[] args)

Inheritance

class MountainBike extends Bicycle {..}

Interface

class ACMEBicycle implements Bicycle {..}

http://docs.oracle.com/javase/tutorial/networking/overview/networking.html

http://docs.oracle.com/javase/tutorial/networking/sockets/index.html

http://docs.oracle.com/javase/8/docs/technotes/guides/desc_jdk_structure.html

* java : launches a Java application

java [options] classname [args]

java [options] -jar filename [args]

Options

-cp class path: specify a list of directories to search for class files.

* javac

http://docs.oracle.com/javase/6/docs/technotes/tools/windows/javac.html

javac [options] [sourcefiles] [classes] [@argfiles]

sourcefiles *.java

=> generates *.class

Options

-d directory: set the destination directory

invokes the class's main()

http://www.oracle.com/technetwork/java/index-138747.html

Applet

import java.applet.Applet;

public class SimpleApplet extends Applet{...}

in HTML

<BODY>

</APPLET>

</BODY>

appletviewer simpleApplet.html

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Java language

http://docs.oracle.com/javase/specs/jls/se8/html/index.html

http://www.javaroad.jp/index_basic.htm

http://www.tohoho-web.com/java/syntax.htm

数値

間に _ を入れてよい

2進数 0b001

long 最後に L をつける

型

char 2-byte unicode 符号なし数値はこれを使うしかない

Refernce Type

class など基本型以外 new で生成

class 変数の初期値は null

定数は final (final float PI=3.4)

配列

個数は length (int[]xx = new int[3]; int n = xx.length;)

API,class,package

https://docs.oracle.com/javase/8/docs/api/overview-summary.html

https://docs.oracle.com/javase/jp/6/api/java/net/Socket.html

System.out is PrintStream

String

a.equals(b)

String[] arg; String[] param = arg.split(":");

int a = Integer.parseInt(param[1]);

16進数表記

public static String toHexString(int i)

System.out.println(Integer.toHexString(arr[i] & 0xff));

Thread.sleep(1000) // 1000ms

Thread.sleep(0, 100) // 100ns

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Socket

https://docs.oracle.com/javase/jp/6/api/java/net/Socket.html

Search with "Java socket API"

複数の通信を受け付けるサーバ

http://www.techscore.com/tech/Java/JavaSE/Network/3-2/

accept でブロックされるので、accept も thread の中に書く

Eclipse

http://mergedoc.osdn.jp/index.html#/pleiades.html

Pleiades All in One 4.4.2.v20150310

Eclipse 4.4 Luna ルナ SR2 for Windows ベース

http://kaya-soft.com/java-toranomaki/programming/devenv/entry1-5_install-pleiadesallinone/

Google Sites

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