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Java Tutorial: Lambda expression in java[How to filter the list of person using lambda expression]

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Ram N

Posts: 2777
Nickname: ramram
Registered: Jul, 2014

Ram N is Java Programmer
Java Tutorial: Lambda expression in java[How to filter the list of person using lambda expression] Posted: May 23, 2017 5:25 AM
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This post originated from an RSS feed registered with Java Buzz by Ram N.
Original Post: Java Tutorial: Lambda expression in java[How to filter the list of person using lambda expression]
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
public class Person
{
private String name;
private int age;

public Person(String name, int age)
{
super();
this.name = name;
this.age = age;
}

public String getName()
{
return name;
}

public void setName(String name)
{
this.name = name;
}

public int getAge()
{
return age;
}

public void setAge(int age)
{
this.age = age;
}

@Override
public String toString()
{
return "Person [name=" + name + ", age=" + age + "]";
}

}
PersonFilter.java
@FunctionalInterface
public interface PersonFilter
{
public boolean filter(Person person);
}
NonLambdaDemo.java
import java.util.Arrays;
import java.util.List;

public class NonLambdaDemo
{
public static void main(String[] args)
{
List<Person> personList = Arrays.asList(
new Person("Carla", 33), new Person("Balu", 32),
new Person("Bharth", 40), new Person("Ajay", 31));

System.out.println("------------Name Starts with B---------");

PersonFilter personFilter = new PersonFilter()
{
@Override
public boolean filter(Person person)
{
return person.getName().startsWith("B");
}
};

printNameBeginWith_B(personList, personFilter);
System.out.println("---------------------------------");

}

/*
* Method to print all people that have name begins with B.
*/

private static void printNameBeginWith_B(List<Person> personList,
PersonFilter personFilter)
{
for (Person person : personList)
{
if (personFilter.filter(person))
{
System.out.println(person);
}
}

}

}
Output
------------Name Starts with B---------
Person [name=Balu, age=32]
Person [name=Bharth, age=40]
---------------------------------
LambdaDemo.java
import java.util.Arrays;
import java.util.List;

public class LambdaDemo
{
public static void main(String[] args)
{
List<Person> personList = Arrays.asList(
new Person("Carla", 33), new Person("Balu", 32),
new Person("Bharth", 40), new Person("Ajay", 31));

System.out.println("------------Name Starts with B---------");

PersonFilter personFilter = person -> person.getName().startsWith("B");
printNameBeginWith_B(personList,personFilter);

System.out.println("----------------------------------------");

}

/*
* Method to print all people that have name begins with B.
*/

private static void printNameBeginWith_B(List<Person> personList,
PersonFilter personFilter)
{
for (Person person : personList)
{
if (personFilter.filter(person))
{
System.out.println(person);
}
}

}

}
Output
------------Name Starts with B---------
Person [name=Balu, age=32]
Person [name=Bharth, age=40]
----------------------------------------
Click the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/LambdaDemo_filter_person_App.zip?attredirects=0&d=1

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

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/c1aa2efd864c22fbec84424255460b099194034f/BasicJava/LambdaDemo_filter_person_App/?at=master

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