How to use collect(Supplier supplier, ObjIntConsumer accumulator, BiConsumer combiner)

Here is an example to explain how to use collect(Supplier<R> supplier, ObjIntConsumer<R> accumulator, BiConsumer<R,R> combiner).

Syntax:

Modifier and Type               Method
<R> R                           collect(Supplier<R> supplier, ObjIntConsumer<R> accumulator, BiConsumer<R,R> combiner)
package com.nourit.java8.Streams.IntStream;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

public class IntStreamCollect {

  public static void main(String[] args) {
    System.out.println("---------- Collectors Example 1 -----------------");
    List<Integer> sourceLongList1 = Arrays.asList(1, 10, 50, 80, 100, 120, 133, 333);
    //Performs a mutable reduction operation on the elements of this stream.
    List<Integer> collect1 = sourceLongList1.stream().filter(l -> l >= 100).collect(ArrayList::new, List::add, List::addAll);
    for (Integer value : collect1){
      System.out.println(value);
    }
    System.out.println("---------- Collectors Example 2 -----------------");
    List<Integer> sourceLongList2 = Arrays.asList(1, 10, 50, 80, 100, 120, 133, 333);
    List<Integer> collect2 = sourceLongList2.stream().filter(l -> l >= 100).collect(Collectors.toList());
    for (Integer value : collect2){
      System.out.println(value);
    }
    System.out.println("---------- Collectors Example 3 -----------------");
    List<Integer> sourceLongList3 = Arrays.asList(1, 10, 50, 80, 100, 120, 133, 333);
    List<Integer> collect3 = sourceLongList3.stream().filter(l -> l >= 100).collect(Collectors.toCollection(ArrayList::new));
    for (Integer value : collect3){
      System.out.println(value);
    }
    System.out.println("---------------------------------------");
  }
}

Output:

---------- Collectors Example 1 -----------------
100
120
133
333
---------- Collectors Example 2 -----------------
100
120
133
333
---------- Collectors Example 3 -----------------
100
120
133
333
---------------------------------------

 

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