Click here to watch in Youtube :
https://www.youtube.com/watch?v=jkYoSzaLsPY&list=UUhwKlOVR041tngjerWxVccw
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 + "]"; } }NonLambdaDemo.java
import java.util.Arrays; import java.util.Collections; import java.util.Comparator; import java.util.List; /** * Before JDK 8 * * With out lambda expression how to sort the list of person by name * */ 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("------------Before Sort by name---------"); printAll(personList); System.out.println("----------------------------------------"); /* * Sort list by Name,Before JDK 8 */ Collections.sort(personList, new Comparator<Person>() { @Override public int compare(Person p1, Person p2) { return p1.getName().compareTo(p2.getName()); } }); System.out.println("\n------------After Sort by name---------"); /* * Create a method that prints all elements in the list. */ printAll(personList); System.out.println("----------------------------------------"); } private static void printAll(List<Person> personList) { for (Person person : personList) { System.out.println(person); } } }Output
------------Before Sort by name--------- Person [name=Carla, age=33] Person [name=Balu, age=32] Person [name=Bharth, age=40] Person [name=Ajay, age=31] ---------------------------------------- ------------After Sort by name--------- Person [name=Ajay, age=31] Person [name=Balu, age=32] Person [name=Bharth, age=40] Person [name=Carla, age=33] ----------------------------------------LambdaDemo.java
import java.util.Arrays; import java.util.Collections; import java.util.List; /** * JDK 8 * * With lambda expression how to sort the list of person by name. * */ 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("------------Before Sort by name---------"); printAll(personList); System.out.println("----------------------------------------"); /* * Sort list by Name, with JDK 8 */ Collections.sort(personList, (p1, p2) -> p1.getName().compareTo(p2.getName())); System.out.println("\n------------After Sort by name---------"); /* * Create a method that prints all elements in the list. */ printAll(personList); System.out.println("----------------------------------------"); } private static void printAll(List<Person> personList) { for (Person person : personList) { System.out.println(person); } } }Output
------------Before Sort by name--------- Person [name=Carla, age=33] Person [name=Balu, age=32] Person [name=Bharth, age=40] Person [name=Ajay, age=31] ---------------------------------------- ------------After Sort by name--------- Person [name=Ajay, age=31] Person [name=Balu, age=32] Person [name=Bharth, age=40] Person [name=Carla, age=33] ----------------------------------------
https://sites.google.com/site/ramj2eev1/home/javabasics/LambdaDemo_sort_pl_App.zip?attredirects=0&d=1
Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/LambdaDemo_sort_pl_App
Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/c1aa2efd864c22fbec84424255460b099194034f/BasicJava/LambdaDemo_sort_pl_App/?at=master
See also:
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