Question

How to join two collections with filter in Java

Answer 1

import java.util.Arrays;
import java.util.Collection;
import java.util.stream.Stream;
import java.util.stream.Collectors;
 
public class MyClass {
    public static void main(String args[]) {
        Collection<String> co1 = Arrays.asList("java", "c", "c++", "rust");
        Collection<String> co2 = Arrays.asList("python", "php", "c#");
     
        Collection<String> result = Stream.concat(
                        co1.stream(), co2.stream())
                        .filter(el -> el.length() > 3)
                        .collect(Collectors.toList());

        System.out.println(result);
    }
}
 
 
 
 
/*
run:
 
[java, rust, python]
 
*/

 

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