system file changes

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

src/HUE_06_Generics.java

@@ -1,5 +1,19 @@
+import java.util.Queue;
+
 public class HUE_06_Generics {
     public static void main(String[] args) {
+        Queue<String> strs = new ChainQueue<String>();
+        strs.add("hallo1");
+        strs.add("hallo2");
+        strs.add("hallo3");
+        System.out.println("Contains: " + strs.contains("hallo1"));
+        System.out.println("Contains: " + strs.contains("hallo4"));
+        System.out.println(" - " + strs.poll() + " #" + strs.size());
+        System.out.println("Contains: " + strs.contains("hallo1"));
+        System.out.println("Contains: " + strs.contains("hallo4"));
+        System.out.println(" - " + strs.poll() + " #" + strs.size());
+        System.out.println(" - " + strs.poll() + " #" + strs.size());
+        System.out.println(" - " + strs.poll() + " #" + strs.size());
 
     }
 }