Added java stream examples

Java/Java-stream-filter/Example1.java

@@ -0,0 +1,65 @@
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+
+enum OrderType {
+    ONLINE,
+    OFFLINE
+}
+
+class Order {
+    private String customerName;
+    private OrderType orderType;
+    private float amount;
+
+    Order(OrderType _orderType, float _amount, String _customerName){
+        this.orderType = _orderType;
+        this.amount = _amount;
+        this.customerName = _customerName;
+    }
+
+    public OrderType getOrderType() {
+        return orderType;
+    }
+
+    public float getAmount() {
+        return amount;
+    }
+
+    public String getCustomerName() {
+        return customerName;
+    }
+
+    static void printOrders(List<Order> orderList){
+        orderList.forEach(e -> {
+            System.out.println("Customer Name : "+e.getCustomerName()+", Order type : "+e.getOrderType()+" , Amount : "+e.getAmount());
+        });
+    }
+}
+
+
+public class Example1 {
+
+    public static void main(String[] args) {
+        Order[] orderArray = {new Order(OrderType.OFFLINE, 1000, "Bob"), new Order(OrderType.ONLINE, 500, "Rose"),
+                new Order(OrderType.OFFLINE, 400, "Nancy"), new Order(OrderType.ONLINE, 1500, "Kate")};
+
+        List<Order> orderList = Arrays.asList(orderArray);
+
+        System.out.println("Given Orders : ");
+        Order.printOrders(orderList);
+
+        List<Order> offlineList = orderList.stream()
+                .filter(item -> item.getOrderType().equals(OrderType.OFFLINE))
+                .collect(Collectors.toList());
+
+        System.out.println("Offline order list : ");
+        Order.printOrders(offlineList);
+
+        List<Order> belowThousandList = orderList.stream()
+                .filter(item -> item.getAmount() < 1000)
+                .collect(Collectors.toList());
+        System.out.println("Orders with less than 1000 : ");
+        Order.printOrders(belowThousandList);
+    }
+}