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. 
   
3. import java.util.ArrayList;
4. import java.util.Arrays;
5. import java.util.List;
6. 
   
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<String> filterList(List<String> fruits, String filter) {
17.         List<String> 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<String> 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<String> 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;
4. 
   
5. import java.util.ArrayList;
6. import java.util.Arrays;
7. import java.util.List;
8. import java.util.stream.Collectors;
9. 
   
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.  */
17. 
    
18. public class filterMethodOfStream {
19. 
    
20. public static void main(String[] args) {
22. List<String> fruits = Arrays.asList("apple", "banana", "lemon");
23. String value="lemon";
24. List<String> 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. }
34. 
    
35. }

Output: