From bcdb5c0ab35c9a1f1367dcf81f444ed09539d5db Mon Sep 17 00:00:00 2001
From: JasonHomeWorkstationUbuntu <jasonzhuyq@outlook.com>
Date: Sat, 25 Jul 2020 18:26:43 +1000
Subject: [PATCH] Added lesson2

---
 .gitmodules       |  3 +++
 Core_JAVA_Volume1 |  1 +
 Dockerfile        |  5 +++++
 lesson2.md        | 43 +++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 52 insertions(+)
 create mode 100644 .gitmodules
 create mode 160000 Core_JAVA_Volume1
 create mode 100644 Dockerfile
 create mode 100644 lesson2.md

diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..c57b043
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "Core_JAVA_Volume1"]
+	path = Core_JAVA_Volume1
+	url = git@github.com:specter01wj/Core_JAVA_Volume1.git
diff --git a/Core_JAVA_Volume1 b/Core_JAVA_Volume1
new file mode 160000
index 0000000..8ca9c76
--- /dev/null
+++ b/Core_JAVA_Volume1
@@ -0,0 +1 @@
+Subproject commit 8ca9c76bf17e49e0d4654973fff7889caf4644e8
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..e7952a6
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,5 @@
+FROM openjdk:slim-buster
+COPY Core_JAVA_Volume1/corejava/v1ch02/ImageViewer /usr/src/myapp
+WORKDIR /usr/src/myapp
+RUN javac ImageViewer.java
+CMD ["java", "ImageViewer"]
\ No newline at end of file
diff --git a/lesson2.md b/lesson2.md
new file mode 100644
index 0000000..cfc9c79
--- /dev/null
+++ b/lesson2.md
@@ -0,0 +1,43 @@
+# Lesson 2: The Java Programming Environment
+
+## Run as server
+
+For headless application (run as server), we can use docker.
+
+After create `FILE.java`, create a `Dockerfile`
+
+```
+FROM openjdk:slim-buster
+COPY <script location> /usr/src/myapp
+WORKDIR /usr/src/myapp
+RUN javac <script>.java
+CMD ["java", "<script name>"]
+```
+
+Then run and build the Docker image
+
+```
+$ docker build -t my-java-app .
+$ docker run -it --rm --name my-running-app my-java-app
+```
+
+## If run as desktop application
+
+First, compile Java
+
+```
+$ javac <script>.java
+```
+
+Then, run Java
+
+```
+$ java <script>
+```
+
+## Run jshell for interaction
+
+Methods:
+
+* 1: `$ jshell`
+* 2: using docker: `docker run --rm -it -v "$(pwd)":/usr/src openjdk:slim-buster`
\ No newline at end of file