Find Words Containing Numbers in List using Java 8 | 7 Easy Stream Methods (Interview Ready)

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package org.practice.basicprgms;

import java.util.Arrays;

import java.util.List;

import java.util.regex.Pattern;

import java.util.stream.Collectors;

public class FindDigitInString {

public static void main(String[] args) {

List<String> list = Arrays.asList("Java8", "Stream", "Code123", "Hello", "Test9", "World", "A1B2", "ChatGPT");

// 1. Using anyMatch

System.out.println("---------------Using anyMatch-------------------");

list.stream()

.filter(word -> word.chars().anyMatch(Character::isDigit))

.forEach(System.out::println);

// 2. Using matches()

System.out.println("---------------Using matches()-------------------");

list.stream()

.filter(word -> word.matches(".*\\d.*"))

.forEach(System.out::println);

// 3. Pattern Regex

System.out.println("---------------Pattern Regex-------------------");

Pattern pattern = Pattern.compile(".*\\d.*");

list.stream()

.filter(word -> pattern.matcher(word).matches())

.forEach(System.out::println);

// 4. Using split() abc123dc- Java8 Java 8

System.out.println("---------------Using split()-------------------");

list.stream()

.filter(word -> !word.equals(String.join("", word.split("\\d+"))))

.forEach(System.out::println);

// 5. Using chars() and Nested filter

System.out.println("---------------Using chars() and Nested filter-------------------");

list.stream()

.filter(word -> word.chars()

.filter(Character::isDigit)

.count() > 0)

.forEach(System.out::println);

// 6. Using toCharArray()

System.out.println("---------------Using toCharArray()-------------------");

list.stream()

.filter(word -> {

for(char c: word.toCharArray()) {

if(Character.isDigit(c))

return true;

}

return false;

}).forEach(System.out::println);

// 7. Using Collectors (Store Result in another list)

List<String> digitWords =

list.stream()

.filter(word -> word.matches(".*\\d.*"))

.collect(Collectors.toList());

System.out.println("Using Collectors "+ digitWords);

}

}

output:

---------------Using anyMatch-------------------

Java8

Code123

Test9

A1B2

---------------Using matches()-------------------

Java8

Code123

Test9

A1B2

---------------Pattern Regex-------------------

Java8

Code123

Test9

A1B2

---------------Using split()-------------------

Java8

Code123

Test9

A1B2

---------------Using chars() and Nested filter-------------------

Java8

Code123

Test9

A1B2

---------------Using toCharArray()-------------------

Java8

Code123

Test9

A1B2

Using Collectors [Java8, Code123, Test9, A1B2]