From 16d8bf228004f71aa9435e0e74b52b87bae0c0ca Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jonas=20Kvarnstr=C3=B6m?= <jonas.kvarnstrom@liu.se>
Date: Sat, 19 Dec 2020 11:35:40 +0100
Subject: Resource folder with example text file and image.  ResourceTester
 class.

---
 src/se/liu/liuid123/HelloWorld.java     | 11 ++++++++
 src/se/liu/liuid123/Main.java           | 11 --------
 src/se/liu/liuid123/ResourceTester.java | 47 +++++++++++++++++++++++++++++++++
 3 files changed, 58 insertions(+), 11 deletions(-)
 create mode 100644 src/se/liu/liuid123/HelloWorld.java
 delete mode 100644 src/se/liu/liuid123/Main.java
 create mode 100644 src/se/liu/liuid123/ResourceTester.java

(limited to 'src/se')

diff --git a/src/se/liu/liuid123/HelloWorld.java b/src/se/liu/liuid123/HelloWorld.java
new file mode 100644
index 0000000..36e2290
--- /dev/null
+++ b/src/se/liu/liuid123/HelloWorld.java
@@ -0,0 +1,11 @@
+package se.liu.liuid123;
+
+/**
+ * A simple test class used to verify that your development environment is working.
+ */
+public class HelloWorld
+{
+    public static void main(String[] args) {
+        System.out.println("Hello world!");
+    }
+}
diff --git a/src/se/liu/liuid123/Main.java b/src/se/liu/liuid123/Main.java
deleted file mode 100644
index 9ad934c..0000000
--- a/src/se/liu/liuid123/Main.java
+++ /dev/null
@@ -1,11 +0,0 @@
-package se.liu.liuid123;
-
-/**
- * A simple test class used to verify that your development environment is working.
- */
-public class Main {
-
-    public static void main(String[] args) {
-        System.out.println("Hello world!");
-    }
-}
diff --git a/src/se/liu/liuid123/ResourceTester.java b/src/se/liu/liuid123/ResourceTester.java
new file mode 100644
index 0000000..89bd438
--- /dev/null
+++ b/src/se/liu/liuid123/ResourceTester.java
@@ -0,0 +1,47 @@
+package se.liu.liuid123;
+
+import javax.swing.*;
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.net.URL;
+
+/**
+ * A simple test class used to exemplify how resources work.
+ */
+public class ResourceTester
+{
+    public static void main(String[] args) {
+        // Reading a text file from *resources* is a bit cumbersome.
+        // We don't know if the file is stored directly in the file system
+        // or inside an *archive* (JAR file), so should access it
+        // as a "resource" identified by an URL.
+        final URL readme = ClassLoader.getSystemResource("README.md");
+
+        // Then we can use this URL to open an *input stream*,
+        // create an InputStreamReader that converts bytes to characters
+        // according to the default character encoding (typically UTF-8),
+        // and then createa a BufferedReader which can be used to read lines.
+        //
+        // All of this is insiude a "try" statement that ensures the streams
+        // and readers are closed when we are done.
+        try (final BufferedReader reader = new BufferedReader(new InputStreamReader(readme.openStream()))) {
+            System.out.println("Contents of the file:");
+
+            // Read and print strings until you get null
+            String str = reader.readLine();
+            while (str != null) {
+                System.out.println(str);
+                str = reader.readLine();
+            }
+        } catch (IOException e) {
+            // Needs to be handled somehow...
+            e.printStackTrace();
+        }
+
+        final URL image = ClassLoader.getSystemResource("images/hello_world.png");
+
+        ImageIcon icon = new ImageIcon(image);
+        System.out.println("Read an image with width " + icon.getIconWidth() + " and height " + icon.getIconHeight());
+    }
+}
-- 
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