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Wednesday, September 13, 2017

java 8 Simple example, Stream , BiFunction, Sorting Using comparator and streams


This post will explain how to sort the list by name using Comparator and java 8 Stream.

usage of BiFunction

package com.siva;

import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.function.BiFunction;
import java.util.stream.Stream;

public class TestJava8Example {
 
 public static void main(String[] args) {
  
  //Usage of BiFunction
  
  BiFunction add = (a, b) -> a + b;
  System.out.println("Addition of two values["+add.apply(20, 30) +"]");
  
  //usage of stream 
  
  List arrayList = new ArrayList();
  Person p = new Person();
  p.setName("siva");
  p.setAge(32);
  arrayList.add(p);
  Person p1 = new Person();
  p1.setName("kumar");
  p1.setAge(33);
  arrayList.add(p1);
  
  Person p2 = new Person();
  p2.setName("raju");
  p2.setAge(33);
  arrayList.add(p2);
  
  Person p3 = new Person();
  p3.setName("jatin");
  p3.setAge(2);
  arrayList.add(p3);
 
  Stream stream = arrayList.stream();
  stream.forEach(x -> System.out.println("Name: [" + x.getName()+"] Age ["+x.getAge()+"]"));
  
  
  //Sort By name Using comparator
  Comparator byPersonName = (Person p4, Person p5) -> p4.getName().compareTo(
              p5.getName());
  Stream sorted = arrayList.stream().sorted(byPersonName);
  sorted.forEach(e -> System.out.println("sorted Name: [" + e.getName()+"] Age ["+e.getAge()+"]"));
  
  
 }
 

}




output

Addition of two values[50]
Name: [siva] Age [32]
Name: [kumar] Age [33]
Name: [raju] Age [33]
Name: [jatin] Age [2]
sorted Name: [jatin] Age [2]
sorted Name: [kumar] Age [33]
sorted Name: [raju] Age [33]
sorted Name: [siva] Age [32]


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