optional examples (#2537)

guest/core-java/src/main/java/com/stackify/optional/Address.java

@@ -0,0 +1,40 @@
+package com.stackify.optional;
+
+public class Address {
+    private String addressLine;
+    private String city;
+    private Country country;
+
+    public Address(String addressLine, String city, Country country) {
+        super();
+        this.addressLine = addressLine;
+        this.city = city;
+        this.country = country;
+    }
+
+    public String getAddressLine() {
+        return addressLine;
+    }
+
+    public void setAddressLine(String addressLine) {
+        this.addressLine = addressLine;
+    }
+
+    public String getCity() {
+        return city;
+    }
+
+    public void setCity(String city) {
+        this.city = city;
+    }
+
+    public Country getCountry() {
+        return country;
+    }
+
+    public void setCountry(Country country) {
+        this.country = country;
+    }
+
+   
+}

guest/core-java/src/main/java/com/stackify/optional/Country.java

@@ -0,0 +1,29 @@
+package com.stackify.optional;
+
+public class Country {
+    private String name;
+    private String isocode;
+
+    public Country(String name, String isocode) {
+        super();
+        this.name = name;
+        this.isocode = isocode;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getIsocode() {
+        return isocode;
+    }
+
+    public void setIsocode(String isocode) {
+        this.isocode = isocode;
+    }
+
+}

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

@@ -0,0 +1,51 @@
+package com.stackify.optional;
+
+import java.util.Optional;
+
+public class User {
+    private String email;
+    private String password;
+
+    private Address address;
+
+    private String position;
+
+    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;
+    }
+
+    public Address getAddress() {
+        return address;
+    }
+
+    public void setAddress(Address address) {
+        this.address = address;
+    }
+
+    public Optional<String> getPosition() {
+        return Optional.ofNullable(position);
+    }
+
+    public void setPosition(String position) {
+        this.position = position;
+    }
+
+}

guest/core-java/src/main/java/com/stackify/optional/chaining/Address.java

@@ -0,0 +1,38 @@
+package com.stackify.optional.chaining;
+
+import java.util.Optional;
+
+public class Address {
+    private String addressLine;
+    private String city;
+    private Country country;
+
+    public Address(String addressLine, String city) {
+        this.addressLine = addressLine;
+        this.city = city;
+    }
+
+    public String getAddressLine() {
+        return addressLine;
+    }
+
+    public void setAddressLine(String addressLine) {
+        this.addressLine = addressLine;
+    }
+
+    public String getCity() {
+        return city;
+    }
+
+    public void setCity(String city) {
+        this.city = city;
+    }
+
+    public Optional<Country> getCountry() {
+        return Optional.ofNullable(country);
+    }
+
+    public void setCountry(Country country) {
+        this.country = country;
+    }   
+}

guest/core-java/src/main/java/com/stackify/optional/chaining/Country.java

@@ -0,0 +1,28 @@
+package com.stackify.optional.chaining;
+
+public class Country {
+    private String name;
+    private String isocode;
+
+    public Country(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getIsocode() {
+        return isocode;
+    }
+
+    public void setIsocode(String isocode) {
+        this.isocode = isocode;
+    }
+
+   
+}

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

@@ -0,0 +1,50 @@
+package com.stackify.optional.chaining;
+
+import java.util.Optional;
+
+public class User {
+    private String email;
+    private String password;
+
+    private Address address;
+
+    private String position;
+
+    public User(String email, String password) {
+        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;
+    }
+
+    public Optional<Address> getAddress() {
+        return Optional.ofNullable(address);
+    }
+
+    public void setAddress(Address address) {
+        this.address = address;
+    }
+
+    public Optional<String> getPosition() {
+        return Optional.ofNullable(position);
+    }
+
+    public void setPosition(String position) {
+        this.position = position;
+    }
+
+}

guest/core-java/src/main/resources/log4j2.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Configuration status="WARN">
+	<Appenders>
+		  <Console name="Console" target="SYSTEM_OUT">
+            <PatternLayout pattern="%msg%n" />
+        </Console>
+	</Appenders>
+	<Loggers>
+		<Root level="info">
+			<AppenderRef ref="Console" />
+		</Root>
+	</Loggers>
+</Configuration>