Java - How to use Stream Filter in Java 8 with List & Array Examples - ozenero

Java - How to use Stream Filter in Java 8 with List & Array Examples - ozenero

[no_toc] Java 8 provides an extremely powerful abstract concept Stream with many useful mechanics for consuming and processing data in Java Collection. In the tutorial, We will use lots of examples to explore more the helpful of Stream API with filtering function on the specific topic: “Filter Collection with Java 8 Stream”. What will we … Continue reading "Java – How to use Stream Filter in Java 8 with List & Array Examples"

https://ozenero.com/java-how-to-use-stream-filter-in-java-8-with-list-array-examples

Java – How to use Stream Filter in Java 8 with List & Array Examples

Java 8 provides an extremely powerful abstract concept Stream with many useful mechanics for consuming and processing data in Java Collection. In the tutorial, We will use lots of examples to explore more the helpful of Stream API with filtering function on the specific topic: "Filter Collection with Java 8 Stream".

What will we do?

  • How to filter List with traditional approach?
  • Use Java 8 Stream to filter List and Array Objects
  • Apply filter() function with other util functions of Stream API in practice

Now let's do examples for more details!

Related posts:

Java Filter List by Traditional Approach with Looping

Before Java 8, for filtering a List Objects, we use the basic approach with looping technical solution.

Looping Example - Filter Integer List

- Example: How to get all even number in a list?

List intList = Arrays.asList(1, 2, 3, 4, 5, 7, 10, 11, 16);

for(Integer i: intList) {
    if(i%2==0) {
        System.out.println(i);
    }
}
/*
    2
    4
    10
    16
 */

Looping Example - Filter String List

- Example: How to get all string that contains "Java" sub-string in a string List?
List<String> strList = Arrays.asList("Java", "Python", "Java Stream", "Java Tutorial", "Nodejs Tutorial");

List<String> newStrList = new ArrayList<String>();

for(String str: strList) {
    if(str.contains("Java")) {
        newStrList.add(str);
    }
}

System.out.println(newStrList);
/*
[Java, Java Stream, Java Tutorial]
*/

Looping Example - Filter Custom Object List

- Create a Customer class:

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Java – How to use Stream Filter in Java 8 with List & Array Examples

java8 stream filter array

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Java 8 provides an extremely powerful abstract concept Stream with many useful mechanics for consuming and processing data in Java Collection. In the tutorial, We will use lots of examples to explore more the helpful of Stream API with filtering function on the specific topic: “Filter Collection with Java 8 Stream”. What will we do? … Continue reading "Java – How to use Stream Filter in Java 8 with List & Array Examples"

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Java 8 provides an extremely powerful abstract concept Stream with many useful mechanics for consuming and processing data in Java Collection. In the tutorial, We will do lots of examples to explore more the helpful of Stream API with reduction operation on the specific topic: “Java 8 Stream Reduce Collection”. What will we do? Explain … Continue reading "How to use Java 8 Stream Reduce Examples with List and Array"

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Converting or transforming a List and Array Objects in Java is a common task when programming. In the tutorial, We show how to do the task with lots of Java examples code by 2 approaches: Using Traditional Solution with basic Looping Using a powerful API – Java 8 Stream Map Now let’s do details with … Continue reading "How to use Java 8 Stream Map Examples with a List or Array"

How to use Java 8 Stream Map Examples with a List or Array - ozenero

[no_toc] Converting or transforming a List and Array Objects in Java is a common task when programming. In the tutorial, We show how to do the task with lots of Java examples code by 2 approaches: Using Traditional Solution with basic Looping Using a powerful API – Java 8 Stream Map Now let’s do details … Continue reading "How to use Java 8 Stream Map Examples with a List or Array"