optional examples (#2537)

guest/core-java-9/src/main/java/com/stackify/optional/User.java

@@ -0,0 +1,28 @@
+package com.stackify.optional;
+
+public class User {
+    private String email;
+    private String password;
+
+    public User(String email, String password) {
+        super();
+        this.email = email;
+        this.password = password;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+}