» » » » Java 8 stream filter method example program

  • We can use java 8 stream class filter method to filter the values from a list /map in java
  • By Using filter() and collect() methods of stream class we can achieve this.
  • Lets see an example program to filter value from list without using java 8 streams and with java 8 stream filter.



#1: Java Example program to filter . remove value from list without using java 8 stream

  1. package com.instanceofjava.filtermethodjava8

  2. import java.util.ArrayList;
  3. import java.util.Arrays;
  4. import java.util.List;

  5. /**
  6.  * @author www.Instanceofjava.com
  7.  * @category interview programs
  8.  * 
  9.  * Description: Remove value from list without using java 8 stream filter method
  10.  *
  11.  */
  12. public class fillterListJava8{
  13. private static List<String> filterList(List<String> fruits, String filter) {
  14.         List<String> result = new ArrayList<>();
  15.         for (String fruit : fruits) {
  16.             if (!filter.equals(fruit)) { 
  17.                 result.add(fruit);
  18.             }
  19.         }
  20.         return result;
  21.     }
  22. public static void main(String[] args) {
  23. List<String> fruits = Arrays.asList("apple", "banana", "lemon");
  24.  
  25. System.out.println("Before..");
  26.  
  27. for (String str : fruits) {
  28.             System.out.println(str);    
  29.         }
  30.  
  31.         List<String> result = filterList(fruits, "lemon");
  32.         System.out.println("After..");
  33.         for (String str : result) {
  34.             System.out.println(str);    
  35.         }
  36. }
  37. }

Output:
  1. Before..
  2. apple
  3. banana
  4. lemon
  5. After..
  6. apple
  7. banana

#2: Java Example program to filter . remove value from list using java 8 java.util.stream

  1. package com.instanceofjava.java8;

  2. import java.util.ArrayList;
  3. import java.util.Arrays;
  4. import java.util.List;
  5. import java.util.stream.Collectors;

  6. /**
  7.  * @author www.Instanceofjava.com
  8.  * @category interview programs
  9.  * 
  10.  * Description: Remove value from list using java 8 stream filter method
  11.  *
  12.  */

  13. public class filterMethodOfStream {

  14. public static void main(String[] args) {
  15. List<String> fruits = Arrays.asList("apple", "banana", "lemon");
  16. String value="lemon";
  17. List<String> result = fruits.stream()                
  18.                 .filter(line -> !value.equals(line))     
  19.                 .collect(Collectors.toList());             
  20.         result.forEach(System.out::println); 
  21.        
  22.         for (String str : result) {
  23.             System.out.println(str);    
  24.         }
  25. }

  26. }






Output:


java 8 stream filter method

Instance Of Java

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