My First Lamda Expression using java 8

I was late trying out my first lambda expressions !!!!! But still I will give a try to sort the names using the Last Name. Here is my Code.

Step:1 Create a Pojo Class 

FileName:Person.java

package com.mycommercesearch.solr;

public class Person {
private String firstName;

private String lastName;

private int age;

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

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

public String getFirstName() {
return firstName;
}

public void setFirstName(String firstName) {
this.firstName = firstName;
}

public String getLastName() {
return lastName;
}

public void setLastName(String lastName) {
this.lastName = lastName;
}

public int getAge() {
return age;
}

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

}

Step:2 Create Interface NameSorter 

FileName:NameSorter.java

package com.mycommercesearch.solr;

import java.util.List;

@FunctionalInterface
public interface NameSorter {
void soryByLastName(List<Person> person,String arrangement);
}

Step:3 Create a main class

FileName:NameTest.java

package com.mycommercesearch.solr;

import java.util.Arrays;

import java.util.Collections;

import java.util.List;

public class NameTest{

public void invokeSample(NameSorter nameTest,List<Person> person,String arrangement) {

nameTest.soryByLastName(person,arrangement);

}

public static void main(String args[]) {

//Here I have Initialized Person array with custom values.

List<Person> myPerson = Arrays.asList(new Person("Syed", "Ghouse", 27),

new Person("Manoj", "Kumar", 45),new Person("Chetan", "Bagath", 50),new Person("Eddapadi", "Palaniswamy", 60),new Person("Paneer", "Selvam", 55));

//Here I have written the lamda expression to print the List

SamplerTest sortName = (person,arrangeMent) -> {

if(!person.isEmpty()) {

person.forEach(ps-> System.out.println("Sorting using the last Name "+arrangeMent+"::"+ps.getFirstName()+" "+ps.getLastName()));

}

};

//Creating the object for my class

NameTest nameTest= new NameTest();

//Passing the behaviour to my interface

nameTest.invokeSample(sortName,myPerson,"Before");

//Invoking the sort by LastName

nameTest.sortLastName(myPerson);

//Passing the sorted bahviuor back to my previous lamda

nameTest.invokeSample(sortName,myPerson,"after");

}

public void sortLastName(List<Person> pes) {

Collections.sort(pes,(Person o1,Person o2)->{

Person p1= (Person)o1;

Person p2=(Person) o2;

return p1.getLastName().compareTo(p2.getLastName());

});

}

}

Output will be in the following format:

Sorting using the last Name Before::Syed Ghouse

Sorting using the last Name Before::Manoj Kumar

Sorting using the last Name Before::Chetan Bagath

Sorting using the last Name Before::Eddapadi Palaniswamy

Sorting using the last Name Before::Paneer Selvam

Sorting using the last Name after::Chetan Bagath

Sorting using the last Name after::Syed Ghouse

Sorting using the last Name after::Manoj Kumar

Sorting using the last Name after::Eddapadi Palaniswamy

Sorting using the last Name after::Paneer Selvam

We can look more on how to use the lamda expressions on our daily coding ways in the upcoming posts.

Happy Expressions!!!!