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Ram N

Posts: 2777
Nickname: ramram
Registered: Jul, 2014

Ram N is Java Programmer
How to use allMatch terminal operation of Java 8 Stream | Streams in Java 8 Posted: Oct 11, 2017 5:37 AM
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This post originated from an RSS feed registered with Java Buzz by Ram N.
Original Post: How to use allMatch terminal operation of Java 8 Stream | Streams in Java 8
Feed Title: JAVA EE
Feed URL: http://ramj2ee.blogspot.com/feeds/posts/default?alt=rss
Feed Description: This blog has viedo tutorials and Sample codes related to below Technologies. 1.J2EE 2.Java 3.Spring 4.Hibernate 5.Database 6.Oracle 7.Mysql 8.Design Patterns
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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;
}

}
StreamAllMatchDemo.java
import java.util.ArrayList;
import java.util.List;

public class StreamAllMatchDemo
{
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));
personList.add(new Person("Frank","frank@gmail.com",Gender.MALE, 33));
personList.add(new Person("Gibb","gibb@gmail.com", Gender.MALE, 27));
personList.add(new Person("Henry","henry@gmail.com", Gender.MALE, 30));
personList.add(new Person("Isabell","isabell@gmail.com",Gender.FEMALE, 22));
personList.add(new Person("Jane","jane@gmail.com",Gender.FEMALE, 24));

/*
* The allMatch()operation answers the question: Do all elements in the
* stream meet this condition? It returns true if and only if all
* elements match a provided predicate, otherwise return false.
*
* This is a short-circuiting terminal operation because the operation
* stops immediately if any unmatched element is found (just like
* short-circuit behavior of the AND operator). The following example
* checks if all persons are male:
*/

boolean areAllMale = personList.stream()
.allMatch(p -> p.getGender().equals(Gender.MALE));

System.out.println("Are all persons male? : " + areAllMale);


boolean allUseGMail = personList.stream()
.allMatch(p -> p.getEmail().endsWith("gmail.com"));

System.out.println("Does everyone use GMail? : " + allUseGMail);
}

}
Output
Are all persons male? : false
Does everyone use GMail? : true

Click the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/StreamDemo_TOP_allmatch_Person.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/StreamDemo_TOP_allmatch_Person

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/17906082b9d83230789adc7b5df551c73ce2b46f/BasicJava/StreamDemo_TOP_allmatch_Person/?at=master

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