added program 9B

also changed the name of screenshot program 9 to program 9A

AreaG.java

@@ -0,0 +1,18 @@
+// 9B
+public class AreaG<T> {
+  private T t;
+  public void add(T t){
+    this.t = t;
+  }
+  public T get() {
+    return t;
+  }
+  public static void main(String[] args){
+    AreaG<Integer> rectange = new AreaG<Integer>();
+    AreaG<Double> circle = new AreaG<Double>();
+    rectange.add(10);
+    circle.add(2.5);
+    System.out.println(rectange.get());
+    System.out.println(circle.get());
+  }
+}