Create Adder.java

Adder.java

@@ -0,0 +1,22 @@
+import java.util.HashSet;
+
+public class Adder {
+  public static void main(String[] args) {
+
+    // Create a HashSet object called numbers
+    HashSet<Integer> numbers = new HashSet<Integer>();
+
+    // Add values to the set
+    numbers.add(4);
+    numbers.add(7);
+    numbers.add(8);
+
+    // Show which numbers between 1 and 10 are in the set
+    for(int i = 1; i <= 10; i++) {
+      if(numbers.contains(i)) {
+        System.out.println(i + " was found in the set.");
+      } else {
+        System.out.println(i + " was not found in the set.");
+      }
+    }
+  }