26 Java 8 Programs using Lambda Expression and Stream

4 October, 2024

Categories: Java 8(JDK1.8) Java Java Examples

26 Java 8 Programs using Lambda Expression and Stream

Write a program to append char in char ex-input- {A, B, C} output->[A_X, B_Y, C_Z]
Write a Java 8 program to calculate the age of a person in years given their birthday
How to check if list is empty in Java 8 using Optional.if not null, iterate through the list and print the object
Count of each character in a String using Java 8
How to count the number of occurrences of a given word in a list of strings using Java 8
Write a Java program To create a map from an array of strings where the key is the string and the value is its length
Drop all while conditions not meet
Duplicate elements with its count using Java 8
How to filter and collect a list/array of strings that start with a specific letter using Java 8 Stream
How to filter an array of strings by a given prefix using Java 8 Stream
How to find next/previous(tomorrow/yesterday) date using Java 8?
Write a Java 8 program to print the first 10 odd numbers
Write a program for group words by first character of given string
How to increment salary of Employee by 2%, 5% etc using java 8
How to iterate and modify values in a Map using Java 8
Find Last duplicate character of given string using Java 8
Write a Java 8 program to get the last element of an array string/object
How to print keys & values of a Map using Java 8
Write a Program to find the Maximum element in an array using Java 8
Find the maximum value in a list of integers using Stream & Method Reference using Java 8
Write a program to find the only duplicate count list in the List using java 8
How to remove all duplicates from an array of integers in Java using Java 8
Given a list of integers, separate odd and even numbers
How to sort a list of strings by length using Lambda expressions using Java 8
Write a program to sum an array using Java 8
Write a program to sum an array without using the sum method using Java 8

Java 8 Program 1:- Write a program to append char in char ex-input- {A, B, C} output->[A_X, B_Y, C_Z]

package r4r.co.in;

import java.util.List;

import java.util.stream.Collectors;

import java.util.stream.Stream;

public class AppendCharInCharExIinput {

//Write a program to append char in char ex-input- {A, B, C} output->[A_X, B_Y, C_Z]

public static void main(String[] args) {

Character[] input = { 'A', 'B', 'C' };

List<String> list = Stream.of(input).map(c -> c + "_" + (char) (c + 23)).collect(Collectors.toList());

System.out.println(list);

}

Java 8 Program 2:- Write a Java 8 program to calculate the age of a person in years given their birthday

package r4r.co.in;

import java.time.LocalDate;

import java.time.Period;

import java.time.temporal.ChronoUnit;

public class CalculateAge {

public static void main(String[] args) {

//Write a Java 8 program to calculate the age of a person in years given their birthday.

//Java-8 (java.time-package)

LocalDate dateOfBirth = LocalDate.of(1982, 07, 21);

LocalDate localDate = LocalDate.now();

//Only Years

System.out.println("Your Age[Year] - " + ChronoUnit.YEARS.between(dateOfBirth, localDate));

// Years,Months,Days

Period period =Period.between(dateOfBirth, localDate);

System.out.println("Year:-"+period.getYears()+" Months:-"+period.getMonths()+" Days:-"+period.getDays());

}

Java 8 Program 3:- How to check if list is empty in Java 8 using Optional.if not null iterate through the list and print the object

package r4r.co.in;

import java.util.Arrays;

import java.util.List;

import java.util.Objects;

import java.util.Optional;

public class CheckListIsEmptyOrNot {

public static void main(String[] args) {

//How to check if list is empty in Java 8 using Optional.if not null iterate through the list and print the object

List<String> checkList=null;//Arrays.asList("Rajesh");

List<String> list= Arrays.asList("Rajesh","Kumar");

Optional.ofNullable(checkList).orElse(list).stream().filter(Objects::nonNull).forEach(System.out::println);

}

Java 8 Program 4:- Count of each character in a String using Java 8

package r4r.co.in;

import java.util.HashMap;

import java.util.LinkedHashMap;

import java.util.Map;

import java.util.function.Function;

import java.util.stream.Collectors;

import java.util.stream.Stream;

public class CountEachCharacterInGivenString {

public static void main(String[] args) {

// Count of each character in a String using Java 8

String str = "I am Rajesh Kumar";

Map<Object, Long> mapUsingHashMap = Stream.of(str.split("")).filter(f -> !f.isBlank()).map(s -> s.toLowerCase())

.collect(Collectors.groupingBy(s -> s, HashMap::new, Collectors.counting()));

System.out.println(mapUsingHashMap);

Map<Object, Long> mapUsingLinkedHashMap = Stream.of(str.split("")).filter(f -> !f.isBlank())

.map(s -> s.toLowerCase())

.collect(Collectors.groupingBy(s -> s, LinkedHashMap::new, Collectors.counting()));

System.out.println(mapUsingLinkedHashMap);

Map<Object, Long> mapUsingFuntionIdentity = Stream.of(str.split("")).filter(f -> !f.isBlank())

.map(s -> s.toLowerCase()).collect(Collectors.groupingBy(Function.identity(), Collectors.counting()));

System.out.print(mapUsingFuntionIdentity);

}

Java 8 Program 5:- How to count the number of occurrences of a given word in a list of strings using Java 8

package r4r.co.in;

import java.util.Arrays;

import java.util.List;

public class CountGivenWordInGivenArryOfStringUsingJava8Lamda {

public static void main(String[] args) {

// How to count the number of occurrences of a given word in a list of strings using Java 8

String[] input = { "Rajesh Kumar r4r", "Rajesh r4r Kumar r4r Rajesh", "r4r r4r" ,"Rajesh Kumar"};

List<String> list = Arrays.asList(input);

//List<String> list=Arrays.asList("Rajesh Kumar r4r", "Rajesh r4r Kumar r4r Rajesh", "r4r r4r" ,"Rajesh Kumar");

String str = "r4r";

long count = list.stream().flatMap(f->Arrays.stream(f.split(" "))).filter(w -> w.equals(str)).count();

System.out.print(count);

}

Java 8 Program 6:- Write a Java program To create a map from an array of strings where the key is the string and the value is its length

package r4r.co.in;

import java.util.Map;

import java.util.stream.Collectors;

import java.util.stream.Stream;

public class CreateMapStringAsKeyAndLengthAsValue {

public static void main(String[] args) {

//Write a Java program To create an map from a array of strings where the key is the string and the value is its length

String[] str= {"Rajesh","Kumar"};

Map<String, Integer> map=Stream.of(str).collect(Collectors.toMap(s->s, String::length));

System.out.print(map);

}

Java 8 Program 7:- Drop all while condition not meet

package r4r.co.in;

import java.util.List;

import java.util.Set;

import java.util.stream.Collectors;

public class DropWhileExamples {

//Drop all while condition not meet

public static void main(String[] args) {

// Unordered stream- non-deterministic

Set<Long> set=Set.of(1L, 5L, 7L, 10L, 11L, 12L).stream().dropWhile(value -> value % 2 != 0).collect(Collectors.toSet());

System.out.println(set);

// Order stream

List<Long> list=List.of(1L, 5L, 7L, 10L, 11L, 12L).stream().dropWhile(value -> value % 2 != 0).collect(Collectors.toList());

System.out.println(list);

}

Java 8 Program 8:- Duplicate elements with its count using Java 8

package r4r.co.in;

import java.util.Arrays;

import java.util.Collections;

import java.util.List;

import java.util.Map;

import java.util.function.Function;

import java.util.stream.Collectors;

public class DuplicateElementsWithItsCount {

public static void main(String[] args) {

// Duplicate elements with its count using Java 8

List<String> list = Arrays.asList("1", "2", "3", "1", "2", "4");

// First Approach

Map<String, Long> map = list.stream().filter(s -> Collections.frequency(list, s) > 1)

.collect(Collectors.groupingBy(Function.identity(), Collectors.counting()));

System.err.println(map);

// Second Approach

Map<String, Long> smap = list.stream()

.collect(Collectors.groupingBy(Function.identity(), Collectors.counting())).entrySet().stream()

.filter(entry -> entry.getValue() > 1)

.collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));

System.out.println(smap);

}

Java 8 Program 9:- How to filter and collect a list/array of strings that start with a specific letter using Java 8 Stream

package r4r.co.in;

import java.util.List;

import java.util.stream.Collectors;

import java.util.stream.Stream;

public class FilterBySpecificCharcter {

public static void main(String[] args) {

//How to filter and collect a list/array of strings that start with a specific letter using Java 8 Stream

String[] input = { "Rajesh", "Rahul", "Verma", "Patel","R4R","r4r r4r" };

List<String> list = Stream.of(input).filter(f -> f.startsWith("R")).collect(Collectors.toList());

System.out.print(list);

}

Java 8 Program 10:- How to filter an array of strings by a given prefix using Java 8 Stream

package r4r.co.in;

import java.util.Arrays;

import java.util.stream.Stream;

public class FilterWithGivenPrefix {

public static void main(String[] args) {

// How to filter an array of strings by a given prefix using Java 8 Stream

String[] str={"Rajesh","Kumar","R4R"};

String prefix="R";

String[] filteredStr=Stream.of(str).filter(s->s.startsWith(prefix)).toArray(String[]::new);

System.out.print(Arrays.toString(filteredStr));

}

Java 8 Program 11:- How to find next/previous(tomorrow/yesterday) date using Java 8 ?

package r4r.co.in;

import java.time.LocalDate;

public class FindTodayTommrowYesterdayUsingJava8 {

public static void main(String[] args) {

//How to find next/previous(tomorrow/yesterday) date using Java 8?

LocalDate date = LocalDate.now();

System.out.println("Today :- " + date);

System.out.println("Yesterday :- " + date.minusDays(1));

System.out.println("Tommorrow :- " + date.plusDays(1));

}

Java 8 Program 12:- Write a Java 8 program to print the first 10 odd numbers.

package r4r.co.in;

import java.util.List;

import java.util.stream.Collectors;

import java.util.stream.Stream;

public class First10thOdd {

//Write a Java 8 program to print the first 10 odd numbers

public static void main(String[] args) {

List<Integer> list=Stream.iterate(0,i->i+1).filter(f->f%2==0).limit(10).collect(Collectors.toList());

System.out.println(list);

List<Integer> integers=Stream.iterate(0, i->i+2).limit(10).collect(Collectors.toList());

System.out.println(integers);

}

Java 8 Program 13:- Write a program for group words by first character of given string.

package r4r.co.in;

import java.util.List;

import java.util.Map;

import java.util.stream.Collectors;

import java.util.stream.Stream;

//Write a program for group words by first character of given string

public class GroupByFirstChacterGivenSring {

public static void main(String[] args) {

String str = "Rajesh Kumar Verma R4r";

Map<Character, List<String>> map = Stream.of(str.split("\s")).

collect(Collectors.groupingBy(s -> s.charAt(0)));

System.out.print(map);

}

Java 8 Program 14:- How to increment salary of Employee by 2%, 5% etc using java 8

package r4r.co.in;

import java.util.List;

import java.util.stream.Collectors;

public class IncrementSalary {

public static void main(String[] args) {

// How to increment salary of Employee by 2%, 5% etc using java 8

List<EmployeeSalary> list = List.of(new EmployeeSalary(1, "Rakesh Kumar", 32, "JUNIOR", 1100),

new EmployeeSalary(2, "Rajesh Kumar", 30, "JUNIOR", 2100),

new EmployeeSalary(3, "Bimal Kumar Patel", 25, "JUNIOR", 1500),

new EmployeeSalary(4, "Brijesh Kumar Patel", 35, "JUNIOR", 1600));

System.out.println("Input List" + list);

//Salary increase by 2

System.out.println("Salary increase by 2 List");

List<EmployeeSalary> employeeSalaries=list.stream().

map(f->new EmployeeSalary(f.getId(), f.getName(), f.getAge(), f.getType(), f.getSalary()+(f.getSalary()*.02))).collect(Collectors.toList());

System.out.println(employeeSalaries);

// Salary increase by 5

System.out.println("Salary increase by 5 List");

List<EmployeeSalary> employeeSalaries1=list.stream().map(f->new EmployeeSalary(f.getId(), f.getName(), f.getAge(), f.getType(), f.getSalary()+(f.getSalary()*.05))).collect(Collectors.toList());

System.out.println(employeeSalaries1);

}

class EmployeeSalary {

int id;

String name;

int age;

String type;

double salary;

public EmployeeSalary(int id, String name, int age, String type, double salary) {

this.id = id;

this.name = name;

this.age = age;

this.type = type;

this.salary = salary;

}

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

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;

}

public String getType() {

return type;

}

public void setType(String type) {

this.type = type;

}

public double getSalary() {

return salary;

}

public void setSalary(double salary) {

this.salary = salary;

}

@Override

public String toString() {

return "Employee [id=" + id + ", name=" + name + ", type=" + type + ", age=" + age + ", salary=" + salary + "]";

}

Java 8 Program 15:- How to iterate and modify values in a Map using Java 8

package r4r.co.in;

import java.util.HashMap;

import java.util.Map;

public class IterateAndmodifyValuesInMapUsingJava8 {

public static void main(String[] args) {

// How to iterate and modify values in a Map using Java 8

Map<String, String> map = new HashMap<String, String>();

map.put("1", "1");

map.put("2", "2");

map.put("3", "3");

map.put("4", "4");

map.put("5", "5");

map.put("6", "6");

System.out.println(map);

map.computeIfPresent("1", (key, value) -> "11");

map.computeIfAbsent("7", (value) -> "7");

System.out.println("Modified Map......");

map.entrySet().forEach(System.out::println);

//or

//map.entrySet().iterator().forEachRemaining(System.out::println);

}

Java 8 Program 16:- Find Last duplicate character of given string using Java 8

package r4r.co.in;

import java.util.Map;

import java.util.function.Function;

import java.util.stream.Collectors;

public class LastDuplicateCharacter {

public static void main(String[] args) {

// Find Last duplicate character of given string using Java 8

String str = "Rajesh Kumar is Java Lead";

Map<Character, Long> mapGroupByCharacters = str.chars().mapToObj(c -> (char) c).map(c->c.toLowerCase(c)).filter(f -> f != ' ')

.collect(Collectors.groupingBy(Function.identity(), Collectors.counting()));

System.out.println(mapGroupByCharacters);

Map<Character, Long> mapOfduplicateChacters = mapGroupByCharacters.entrySet().stream()

.filter(f -> f.getValue() > 1).collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));

System.out.println(mapOfduplicateChacters);

Map<Character, Long> lastElement = mapOfduplicateChacters.entrySet().stream()

.skip(mapOfduplicateChacters.size() - 1)

.collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));

System.out.println(lastElement);

}

Java 8 Program 17:- Write a Java 8 program to get the last element of an array string/object

package r4r.co.in;

import java.util.stream.Stream;

public class LastElementOfAnArray {

public static void main(String[] args) {

//Write a Java 8 program to get the last element of an array string/object

String[] input = { "Rajesh", "Kumar", "Verma", "R4R" };

String lastElement = Stream.of(input).skip(input.length - 1).findAny().get();

System.out.println(lastElement);

}

Java 8 Program 18:- How to print keys & values of a Map using Java 8.

package r4r.co.in;

import java.util.HashMap;

import java.util.Map;

import java.util.stream.Stream;

public class MapExamplesJava8 {

public static void main(String[] args) {

// How to print keys & values of a Map using Java 8

Map<String,String> map= new HashMap<String, String>();

map.put("Key-1","value-1");

map.put("Key-2","value-2");

map.put("Key-3","value-3");

map.put("Key-4","value-4");

//using forEachRemaining

//Using Java 8 – Collection.iterator() and Iterator.forEachRemaining()

map.entrySet().iterator().forEachRemaining(System.out::print);

//all values

System.out.println("\n---------------------");

map.values().forEach(System.out::print);

System.out.println("\n---------------------");

//Using Java 8 – Collection.stream() and Stream.forEach()

map.entrySet().stream().forEach(System.out::print);

System.out.println("\n---------------------");

//Stream -keys and values.

Stream.of(map).map(m->m.keySet()).forEach(System.out::print);

System.out.println("\n---------------------");

Stream.of(map).map(m->m.values()).forEach(System.out::print);

System.out.println("\n---------------------");

//Using Java 8 – Stream.of() + Collection.toArray() + Stream.forEach()

Stream.of(map.entrySet().toArray()).forEach(System.out::print);

System.out.println("\n---------------------");

//Using Java 8 - Stream.of() and Collection.toString() and Stream.forEach()

Stream.of(map.entrySet().toString()).forEach(System.out::print);

}

Java 8 Program 19:- Write a Program to find the Maximum element in an array using Java 8.

package r4r.co.in;

import java.util.Arrays;

import java.util.Comparator;

public class MaximumOfGivenArray {

public static void main(String[] args) {

//Write a Program to find the Maximum element in an array using Java 8

int[] arr= {1,2,3,4,5,66,6,7,7,4,8};

int max=Arrays.stream(arr).max().getAsInt();

System.out.println(max);

Integer[] arrInteger= {2,3,45,56,67,27,76,83,28,228,338,4343};

Integer maxValue=Arrays.stream(arrInteger).max(Comparator.naturalOrder()).get();

System.out.println(maxValue);

}

Java 8 Program 20:- Find the maximum value in a list of integers using Stream & Method Reference using Java 8.

package r4r.co.in;

import java.util.Arrays;

import java.util.List;

import java.util.Optional;

import java.util.stream.Stream;

public class MaxUsingMethodReferencing {

static Optional<Integer> maxValue(Stream<Integer> s) {

Optional<Integer> max=s.max(Integer::compare);

return max;

}

public static void main(String[] args) {

//Find the maximum value in a list of integers using Stream & Method Reference

List<Integer> list=Arrays.asList(1,3,4,5,6,7,77,8,8,9);

int max=maxValue(list.stream()).orElse(-1);

System.out.println(max);

}

Java 8 Program 21:- Write a program to find the only duplicate count list in the List using java 8.

package r4r.co.in;

import java.util.Collections;

import java.util.List;

import java.util.Map;

import java.util.function.Function;

import java.util.stream.Collectors;

public class OnlyDuplicateCountList {

public static void main(String[] args) {

// Write a program to find the only duplicate count list in the List

List<String> list = List.of("Rajesh", "Kumar", "Verma", "Verma", "Rani", "Prisha", "Prisha", "Verma", "Rani");

Map<String, Long> map = list.stream().filter(d -> Collections.frequency(list, d) > 1)

.collect(Collectors.groupingBy(Function.identity(), Collectors.counting()));

System.out.println(map);

}

Java 8 Program 22:- How to remove all duplicates from an array of integers in Java using Java 8.

package r4r.co.in;

import java.util.Arrays;

import java.util.stream.Stream;

public class RemoveAllDuplicateInteger {

public static void main(String[] args) {

//How to remove all duplicates from an array of integers in Java using Java 8

Integer [] input= {1,2,3,6,1,9,3,7,3,7,8,3,4,5,6};

Integer[] output=Stream.of(input).distinct().toArray(Integer[]::new);

System.out.print(Arrays.toString(output));

}

Java 8 Program 23:- Given a list of integers, separate odd and even numbers.

package r4r.co.in;

import java.util.Arrays;

import java.util.List;

import java.util.Map;

import java.util.stream.Collectors;

import java.util.stream.Stream;

public class SeparateOddAndEvenNumbers {

public static void main(String[] args) {

//Given a list of integers, separate odd and even numbers

Integer[] input= {1,2,3,4,5,6,7,8,9,10};

//Stream.of(input)-stream

List<Integer> list=Arrays.asList(input);

Map<Boolean, List<Integer>> oddEvenMap=list.stream().collect(Collectors.partitioningBy(s->s%2==0));

System.out.println(oddEvenMap);

for (Map.Entry<Boolean,List<Integer>> entry:oddEvenMap.entrySet()) {

List<Integer> values=entry.getValue();

Boolean key=entry.getKey();

if(key)

System.out.println("Even");

else

System.out.println("Odd");

System.out.println(values);

}

Java 8 Program 24 :- How to sort a list of strings by length using Lambda expressions using Java 8.

package r4r.co.in;

import java.util.List;

import java.util.stream.Collectors;

import java.util.stream.Stream;

public class ShortByLengthOfString {

public static void main(String[] args) {

// How to sort a list of strings by length using Lambda expressions using Java 8

String[] str = { "Rajesh Kumar", "Rajesh", "Kumar", "R4R" ,"Rajesh r4r"};

List<String> list = Stream.of(str).sorted((o1, o2) -> (o1.length() - o2.length())).collect(Collectors.toList());

System.out.print(list);

}

Java 8 Program 25:- Write a program to sum an array using Java 8

package r4r.co.in;

import java.util.stream.Collectors;

import java.util.stream.Stream;

public class SumAnArray {

//Write a program to sum an array using Java 8

public static void main(String[] args) {

Integer[] input= {1,2,3,4,5,6,7,8,9,10};

int sum=Stream.of(input).collect(Collectors.summingInt(Integer::intValue));

System.err.println(sum);

}

Java 8 Program 26:- Write a program to sum an array without using the sum method using Java 8.

package r4r.co.in;

import java.util.stream.Stream;

public class SumWithoutUsingSumMenthod {

public static void main(String[] args) {

//Write a program to sum an array without using the sum method using Java 8

Integer[] input= {1,2,34,5,6,7,8,78,9,99,9,5,97,96,79};

Integer sum=Stream.of(input).reduce(0, (x,y)->x+y).intValue();

System.out.print(sum);

}

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