Java8 stream (#3585)

* java 8 stream code so far

* more examples

* code change

* fix test names

* fix unit test

* move code to correct location

* more unit tests

* more tests

guest/core-java/pom.xml

@@ -16,6 +16,24 @@
 			<artifactId>log4j-core</artifactId>
 			<version>${log4j2.version}</version>
 		</dependency>
+        <dependency>
+            <groupId>org.hamcrest</groupId>
+            <artifactId>hamcrest-core</artifactId>
+            <version>${org.hamcrest.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.hamcrest</groupId>
+            <artifactId>hamcrest-library</artifactId>
+            <version>${org.hamcrest.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.hamcrest</groupId>
+            <artifactId>hamcrest-all</artifactId>
+            <version>${org.hamcrest.version}</version>
+            <scope>test</scope>
+        </dependency>
 	</dependencies>
 
 	<build>
@@ -32,5 +50,6 @@
 	</build>
 	<properties>
 		<log4j2.version>2.8.2</log4j2.version>
+		<org.hamcrest.version>1.3</org.hamcrest.version>
 	</properties>
 </project>

guest/core-java/src/main/java/com/stackify/stream/Employee.java

@@ -0,0 +1,46 @@
+package com.stackify.stream;
+
+public class Employee {
+    private Integer id;
+    private String name;
+    private Double salary;
+    
+    public Employee(Integer id, String name, Double salary) {
+        this.id = id;
+        this.name = name;        
+        this.salary = salary;
+    }
+
+    public Integer getId() {
+        return id;
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+    
+    public Double getSalary() {
+        return salary;
+    }
+
+    public void setSalary(Double salary) {
+        this.salary = salary;
+    }
+    
+    public void salaryIncrement(Double percentage) {
+        Double newSalary = salary + percentage * salary / 100;
+        setSalary(newSalary);
+    }
+
+    public String toString() {
+        return "Id: " + id + " Name:" + name + " Price:" + salary;
+    }
+}

guest/core-java/src/main/java/com/stackify/stream/EmployeeRepository.java

@@ -0,0 +1,21 @@
+package com.stackify.stream;
+
+import java.util.List;
+
+public class EmployeeRepository {
+    private List<Employee> empList;
+    
+    public EmployeeRepository(List<Employee> empList) {
+        this.empList = empList;
+    
+    }
+    public Employee findById(Integer id) {
+        for (Employee emp : empList) {
+            if (emp.getId() == id) {
+                return emp;
+            }
+        }
+        
+        return null;
+    }
+}