Java Stream Filter

1) Display the string which is matched with condition by using stream.

import java.util.ArrayList;

import java.util.List;

public class javaStreamExamples {

    List<String> list1=new ArrayList<>();

    public void testStream(){

        list1.add("Test");

        list1.add("Testing");

        list1.add("Selenium");

        list1.stream().filter(s->s.contains("Test")).forEach(System.out::println);

    }

}

O/p

Test

Testing 

==================================================

2) Find duplicate number in given integer using string

import java.util.ArrayList;
import java.util.List;

public class javaStreamExamples {
    List<Integer> list1=Arrays.asList(10,20,35,20,67,10)

    public void testStream(){
        Set<Integer> set1= new HashSet();
        list1.stream().filter(s->!set1.add(s)).forEach(System.out::println);

    }

}

O/p

10

20

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Java Stream Sorted

1) Sort number in given integer using stream in ascending order

import java.util.ArrayList;

import java.util.List;

public class javaStreamExamples {

    List<Integer> list1=Arrays.asList(10,20,35,20,67,10)

    public void testStream(){

        Set<Integer> set1= new HashSet();

        list1.stream().sorted().forEach(System.out::println);

    }

}

O/p

10

10

20

20

35

67

==================================================

1) Sort number in given integer using stream in Descending order

import java.util.ArrayList;

import java.util.List;

public class javaStreamExamples {

    List<Integer> list1=Arrays.asList(10,20,35,20,67,10)

    public void testStream(){

        Set<Integer> set1= new HashSet();

        list1.stream().sorted(Collections.reverseOrder()).forEach(System.out::println);

    }

}

O/p

67

35

20

20

10

10

==================================================

Difference between Java Stream Map and Java Stream Filter

Java stream filter - Filter used to filter the data and always returns the boolean value. If its return is true then it will be added to the list.

Java Stream map - consisting result of the given function applying to the element.

collect the element from Stream

Collect the element in Set format

 Set<String> finalString= list1.stream().filter(s -> s.contains("Test")).collect(Collectors.toSet());
        System.out.println(finalString);
--------------------------------------------

Collect the element in List format

Method 1

 List<String> finalString= list1.stream().filter(s -> s.contains("Test")).collect(Collectors.toList());
        System.out.println(finalString);

Method2

List<String> finalString= list1.stream().filter(s -> s.contains("Test")).toList();
        System.out.println(finalString);
-----------------------------------

Java Stream Max

1) Find Maximum number in Array list

import java.util.ArrayList;

import java.util.List;

public class javaStreamExamples {

    List<Integer> list1=Arrays.asList(10,20,35,20,67,10)

    public void testStream(){

        Int max1=list1.stream().max(Integer:: compare).get();

System.out.println(max1);

    }

}

O/p

67

≠=================================

1) Find Minimum number in Array list

import java.util.ArrayList;

import java.util.List;

public class javaStreamExamples {

    List<Integer> list1=Arrays.asList(10,20,35,20,67,10)

    public void testStream(){

        Int min1=list1.stream().max(Comparator.reverseOrder()).get();

System.out.println(min1);

    }

}

O/p

67

≠=================================