CODEWITHSUNDEEP
java-8java-stream
user3305063
user3305063

Reputation: 471

creating list from java 8 stream api

I have an XML schema and generated corresponding POJO classes from JAXB. The xml sample is provided at the end.

I have a list which holds ship orders. I want to collect all items if the price of the item is more than 100. I was able to do it using java 7 but thought of doing the same in java 8 using streams. I tried but couldn't achieve the same. Could some one please help me how to write the code?

    List<Shiporder> shiporders = new ArrayList<>();
            shiporders.add(getShipOrder("src/allinone/order1.xml"));
            shiporders.add(getShipOrder("src/allinone/order2.xml"));

<shiporder orderid="Order_1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:noNamespaceSchemaLocation="shiporder.xsd">
    <orderperson>Suman pandey</orderperson>
    <shipto>
        <name>Suman pandey</name>
        <address>BTM layout</address>
        <city>Bangalore</city>
        <country>India</country>
    </shipto>
<item>
        <title>Samsung S2</title>
        <note>Special Edition</note>
        <quantity>1</quantity>
        <price>100.90</price>
    </item>
<item>
        <title>Oppo</title>
        <quantity>4</quantity>
        <price>20.90</price>
    </item>
</shiporder>

Upvotes: 1

Views: 967

Answers (2)

holi-java
holi-java

Reputation: 30686

How about this?

List<Item> items = shiporders.stream()
                             .map(Shiporder::getItems)
                             .flatMap(List::stream)
                             .filter(it -> it.price > 100)
                             .collect(Collectors.toList());

Upvotes: 4

hopscotch
hopscotch

Reputation: 203

shiporders.stream()
    .filter(new Predicate<Shiporder>(){
        public boolean test(Shiporder shiporder) {
            return <boolean condition on shiporder>;
        }
    }).collect(Collectors.asList);

or you can substitute the anonymous inner class with a lambda in the form

shiporders.stream()
    .filter(shiporder -> <boolean condition on shiporder>)
    .collect(Collectors.asList);

Upvotes: 1

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