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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

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

  7. /**
  8.  * @author www.Instanceofjava.com
  9.  * @category interview programs
  10.  * 
  11.  * Description: Remove value from list without using java 8 stream filter method
  12.  *
  13.  */
  14. public class fillterListJava8{
  16. private static List filterList(List fruits, String filter) {
  17.         List result = new ArrayList();
  18.         for (String fruit : fruits) {
  19.             if (!filter.equals(fruit)) { 
  20.                 result.add(fruit);
  21.             }
  22.         }
  23.         return result;
  24.     }
  25. public static void main(String[] args) {
  27. List fruits = Arrays.asList("apple", "banana", "lemon");
  28.  
  29. System.out.println("Before..");
  30.  
  31. for (String str : fruits) {
  32.             System.out.println(str);    
  33.         }
  34.  
  35.         List result = filterList(fruits, "lemon");
  36.         System.out.println("After..");
  37.         for (String str : result) {
  38.             System.out.println(str);    
  39.         }
  40. }
  42. }

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

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

  3. package com.instanceofjava.java8;

  5. import java.util.ArrayList;
  6. import java.util.Arrays;
  7. import java.util.List;
  8. import java.util.stream.Collectors;

  10. /**
  11.  * @author www.Instanceofjava.com
  12.  * @category interview programs
  13.  * 
  14.  * Description: Remove value from list using java 8 stream filter method
  15.  *
  16.  */

  18. public class filterMethodOfStream {

  20. public static void main(String[] args) {
  22. List fruits = Arrays.asList("apple", "banana", "lemon");
  23. String value="lemon";
  24. List result = fruits.stream()                
  25.                 .filter(line -> !value.equals(line))     
  26.                 .collect(Collectors.toList());             
  27.         result.forEach(System.out::println); 
  28.        
  29.         for (String str : result) {
  30.             System.out.println(str);    
  31.         }
  32. }

  35. }






Output:


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Java 8 stream filter method example program

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