add demo for how new keyword working

src/jvm/ObjectCreate.java

@@ -0,0 +1,27 @@
+package jvm;
+
+/**
+ * This class is intended to demo how jvm create object and invoke constructor. Please see byte code.
+ * use javap -v ObjectCreate.class  or javap -c  ObjectCreate.class to see byte code
+ */
+public class ObjectCreate {
+    private String field;
+
+    // will invoked by invokespecial
+    public ObjectCreate(String field) {
+            this.field = field;
+    }
+
+    public void print() {
+        show();
+    }
+
+    private void show() {
+        System.out.println(field);
+    }
+
+    public static void main(String[] args) {
+        ObjectCreate objectCreate = new ObjectCreate("hello!");
+        objectCreate.print();
+    }
+}