[BAEL-1536] A Guide to the Resource Bundle (#3602)

* [BAEL-1536] A Guide to the Resource Bundle

The essential code for the article

* [BAEL-1536] A Guide to the Resource Bundle #2

The essential code for the article after the first article review.

* [BAEL-1536] A Guide to the Resource Bundle #3

Essential changes after the second review.

* [BAEL-1536] A Guide to the Resource Bundle #4

Essential changes after the second review:
- Doubles to BigDecimals

core-java/src/main/java/com/baeldung/resourcebundle/ExampleControl.java

@@ -0,0 +1,15 @@
+package com.baeldung.resourcebundle;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Locale;
+import java.util.ResourceBundle;
+
+public class ExampleControl extends ResourceBundle.Control {
+
+    @Override
+    public List<Locale> getCandidateLocales(String s, Locale locale) {
+        return Arrays.asList(new Locale("pl", "PL"));
+    }
+
+}

core-java/src/main/java/com/baeldung/resourcebundle/ExampleResource.java

@@ -0,0 +1,14 @@
+package com.baeldung.resourcebundle;
+
+import java.util.ListResourceBundle;
+
+public class ExampleResource extends ListResourceBundle {
+
+    @Override
+    protected Object[][] getContents() {
+        return new Object[][] { 
+            { "greeting", "hello" } 
+        };
+    }
+
+}

core-java/src/main/java/com/baeldung/resourcebundle/ExampleResource_pl.java

@@ -0,0 +1,15 @@
+package com.baeldung.resourcebundle;
+
+import java.util.ListResourceBundle;
+
+public class ExampleResource_pl extends ListResourceBundle {
+
+    @Override
+    protected Object[][] getContents() {
+        return new Object[][] { 
+            { "greeting", "cześć" }, 
+            { "language", "polish" }, 
+        };
+    }
+
+}

core-java/src/main/java/com/baeldung/resourcebundle/ExampleResource_pl_PL.java

@@ -0,0 +1,17 @@
+package com.baeldung.resourcebundle;
+
+import java.math.BigDecimal;
+import java.util.ListResourceBundle;
+
+public class ExampleResource_pl_PL extends ListResourceBundle {
+
+    @Override
+    protected Object[][] getContents() {
+        return new Object[][] { 
+            { "currency", "polish zloty" }, 
+            { "toUsdRate", new BigDecimal("3.401") },
+            { "cities", new String[] { "Warsaw", "Cracow" } } 
+        };
+    }
+
+}