Added java stream examples

Java/Java-stream-filter/Example2.java

@@ -0,0 +1,50 @@
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+
+class Customer {
+    private String name;
+    private String country;
+
+    Customer(String _name, String _country){
+        this.name = _name;
+        this.country = _country;
+    }
+
+    String getCountry() {
+        return country;
+    }
+
+    private String getName() {
+        return name;
+    }
+
+    static void printCustomerDetail(List<Customer> customerList){
+        customerList.forEach( e -> System.out.println("Customer name : "+e.getName()+" Country : "+e.getCountry()));
+    }
+}
+
+
+public class Example2 {
+
+    public static void main(String[] args) {
+        Map<Integer,Customer> customerMap = new HashMap<>();
+        String country = "UK";
+
+        customerMap.put(1, new Customer("Boris","UK"));
+        customerMap.put(2, new Customer("William","UK"));
+        customerMap.put(3, new Customer("Simon","UK"));
+        customerMap.put(4, new Customer("Paul","Zimbabwe"));
+
+        List<Customer> customerList = customerMap
+                .entrySet()
+                .stream()
+                .filter(x -> x.getValue().getCountry().equals(country))
+                .map(item -> item.getValue())
+                .collect(Collectors.toList());
+
+        Customer.printCustomerDetail(customerList);
+    }
+}