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

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:

More at:

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

#java8 #stream #filter #array

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

Tyrique Littel

1600135200

How to Install OpenJDK 11 on CentOS 8

What is OpenJDK?

OpenJDk or Open Java Development Kit is a free, open-source framework of the Java Platform, Standard Edition (or Java SE). It contains the virtual machine, the Java Class Library, and the Java compiler. The difference between the Oracle OpenJDK and Oracle JDK is that OpenJDK is a source code reference point for the open-source model. Simultaneously, the Oracle JDK is a continuation or advanced model of the OpenJDK, which is not open source and requires a license to use.

In this article, we will be installing OpenJDK on Centos 8.

#tutorials #alternatives #centos #centos 8 #configuration #dnf #frameworks #java #java development kit #java ee #java environment variables #java framework #java jdk #java jre #java platform #java sdk #java se #jdk #jre #open java development kit #open source #openjdk #openjdk 11 #openjdk 8 #openjdk runtime environment

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

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:

More at:

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

#java8 #stream #filter #array

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

https://grokonez.com/java/java-8/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

[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 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?

More at:

https://grokonez.com/java/java-8/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 #java8 #stream #array

Joseph  Murray

Joseph Murray

1623911281

How to Print an Array in Java

Introduction

Printing an array is a quick way to give us visibility on the values of the contents inside. Sometimes the array values are the desired output of the program.

In this article, we’ll take a look at how to print an array in Java using four different ways.

While the “best way” depends on what your program needs to do, we begin with the simplest method for printing and then show more verbose ways to do it.

#java #array #how to print an array in java #array in java #print an array in java #print

How to use Java 8 Stream Reduce Examples with List and Array

https://grokonez.com/java/java-8/how-to-use-java-8-stream-reduce-examples-with-list-and-array

How to use Java 8 Stream Reduce Examples with List and Array

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 how Java 8 Stream Reduce work?
  • Apply Stream Reduction on Java List, Array
Now let’s do examples for more details!

Related posts:

Java Stream Reduce

Java Stream Reduction is a terminal operation that aggregates a Java Stream then returns one value by combining the contents of a stream.

Many reduction operations perform a specific task such as: average, sum, min, max, and count.

  • Examples:
  • Initial Java List:
List<Integer> intLst = Arrays.asList(1, 3, 5, 2, 9, 8, 15, 12);
  • How to sum all Element of a Stream?
int totalOpt = intLst.stream().mapToInt(i->i).sum();
System.out.println(totalOpt);
// 55
  • How to get average value of an Integer List?

OptionalDouble averageOpt = intLst.stream().mapToInt(i->i).average();
averageOpt.ifPresent(System.out::println);
// 6.875
  • How to get Min/Max value of an Integer List?

/* Get Min Value */
OptionalInt minOpt = intLst.stream().mapToInt(i->i).min();
minOpt.ifPresent(System.out::println);
// 1

/* Get Max value */
OptionalInt maxOpt = intLst.stream().mapToInt(i->i).max();
maxOpt.ifPresent(System.out::println);
// 15

More:

https://grokonez.com/java/java-8/how-to-use-java-8-stream-reduce-examples-with-list-and-array

#java8 #stream #reduce #list #array