JAVA EE: Java Lambda expressions[forEach method of List - Person]

Tuesday 30 May 2017

Java Lambda expressions[forEach method of List - Person] | Lambda expression in Java

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Java Lambda expressions[forEach method of List - Person] | Lambda expression in Java

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 + "]";
    }

}

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("---------- With out lambda-----------------");
        /*
         * Before JDK 8, With out lambda
         */
        for (Person person : personList)
        {
            System.out.println(person);
        }
        
        System.out.println("\n----------With lambda-----------------");

        /*
         * Now JDK 8 , With lambda
         */
        personList.forEach(person -> System.out.println(person));
        
        System.out.println("\n----------Method Reference-------------");
        
        /*
         * Method Reference
         */
        personList.forEach(System.out::println);
        
    }

}

Output

---------- With out lambda-----------------
Person [name=Carla, age=33]
Person [name=Balu, age=32]
Person [name=Bharth, age=40]
Person [name=Ajay, age=31]

----------With lambda-----------------
Person [name=Carla, age=33]
Person [name=Balu, age=32]
Person [name=Bharth, age=40]
Person [name=Ajay, age=31]

----------Method Reference-------------
Person [name=Carla, age=33]
Person [name=Balu, age=32]
Person [name=Bharth, age=40]
Person [name=Ajay, age=31]