Click here to watch in Youtube :
https://www.youtube.com/watch?v=XKIG-i_2BVE&list=UUhwKlOVR041tngjerWxVccw
Person.java
https://sites.google.com/site/ramj2eev1/home/javabasics/StreamDemo_reduce_accumulate.zip?attredirects=0&d=1
Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/StreamDemo_reduce_accumulate
Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/a9fa8aa6476993bce8a79f4d0e8f1799d1d35a7f/BasicJava/StreamDemo_reduce_accumulate/?at=master
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https://www.youtube.com/watch?v=XKIG-i_2BVE&list=UUhwKlOVR041tngjerWxVccw
Person.java
enum Gender { MALE, FEMALE } public class Person { private String name; private String email; private Gender gender; private int age; public Person(String name, String email, Gender gender, int age) { super(); this.name = name; this.email = email; this.gender = gender; this.age = age; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } public Gender getGender() { return gender; } public void setGender(Gender gender) { this.gender = gender; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } @Override public String toString() { return "Person [name=" + name + "]"; } }StreamReduceDemo1.java
import java.util.ArrayList; import java.util.List; import java.util.Optional; public class StreamReduceDemo1 { public static void main(String[] args) { List<Person> personList = new ArrayList<>(); personList.add(new Person("Alice","alice@gmail.com", Gender.FEMALE, 26)); personList.add(new Person("Bob","bob@gmail.com", Gender.MALE, 32)); personList.add(new Person("Carol","carol@gmail.com",Gender.FEMALE, 23)); personList.add(new Person("David","david@gmail.com", Gender.MALE, 39)); personList.add(new Person("Eric","eric@gmail.com", Gender.MALE, 26)); /* * * Version #1: Optional<T> reduce(BinaryOperator<T> accumulator) - This * method performs a reduction on the elements of the stream, using an * associative accumulation function, and returns an Optional object * describing the reduced value. * * For example, the following code accumulates names of all persons into * a String: */ Optional<String> optional = personList.stream().map(p -> p.getName()) .reduce((name1, name2) -> name1 + ", " + name2); if (optional.isPresent()) { String names = optional.get(); System.out.println(names); } } }Output
Alice, Bob, Carol, David, EricStreamReduceDemo2.java
import java.util.Arrays; public class StreamReduceDemo2 { public static void main(String[] args) { int[] numberArray = { 2, 3, 5}; /* * Version #2: T reduce(T identity, BinaryOperator<T> accumulator) - * This method is similar to the version #1, but it returns the reduced * value of the specified type T. The identity value must be an identity * value for the accumulator function, which means it does not affect * the result of accumulation. * * The following code calculates sum of numbers in a stream: */ int sum = Arrays.stream(numberArray).reduce(0, (x, y) -> (x + y)); System.out.println("sum = " + sum); } }Output
sum = 10Click the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/StreamDemo_reduce_accumulate.zip?attredirects=0&d=1
Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/StreamDemo_reduce_accumulate
Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/a9fa8aa6476993bce8a79f4d0e8f1799d1d35a7f/BasicJava/StreamDemo_reduce_accumulate/?at=master
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