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Sets intersection() function | Guava | Java

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  • Last Updated : 14 Nov, 2018

Guava’s Sets.intersection() returns an unmodifiable view of the intersection of two sets. The returned set contains all elements that are contained by both backing sets. The iteration order of the returned set matches that of set1.

Syntax:

public static <E> 
    Sets.SetView<E> 
        intersection(Set<E> set1, Set<?> set2)

Return Value: This method returns an unmodifiable view of the intersection of two sets.

Below examples illustrate the working of Sets intersection method:

Example 1:




// Java code to show implementation
// of Guava's Sets.intersection() method
  
import com.google.common.collect.Sets;
import java.util.Set;
  
class GFG {
  
    // Driver's code
    public static void main(String[] args)
    {
        // Creating first set
        Set<Integer>
            set1 = Sets.newHashSet(10, 20, 30, 40, 50);
  
        // Creating second set
        Set<Integer>
            set2 = Sets.newHashSet(30, 50, 70, 90);
  
        // Using Guava's Sets.intersection() method
        Set<Integer>
            answer = Sets.intersection(set1, set2);
  
        // Displaying the intersection of set1 and set2
        System.out.println("Set 1: "
                           + set1);
        System.out.println("Set 2: "
                           + set2);
        System.out.println("Set 1 intersection Set 2: "
                           + answer);
    }
}

Output:

Set 1: [40, 10, 50, 20, 30]
Set 2: [50, 90, 30, 70]
Set 1 intersection Set 2: [50, 30]

Example 2:




// Java code to show implementation
// of Guava's Sets.intersection() method
  
import com.google.common.collect.Sets;
import java.util.Set;
  
class GFG {
  
    // Driver's code
    public static void main(String[] args)
    {
        // Creating first set
        Set<String>
            set1 = Sets.newHashSet("G", "e", "e", "k", "s");
  
        // Creating second set
        Set<String>
            set2 = Sets.newHashSet("g", "f", "G", "e");
  
        // Using Guava's Sets.intersection() method
        Set<String>
            answer = Sets.intersection(set1, set2);
  
        // Displaying the intersection of set1 and set2
        System.out.println("Set 1: "
                           + set1);
        System.out.println("Set 2: "
                           + set2);
        System.out.println("Set 1 intersection Set 2: "
                           + answer);
    }
}

Output:

Set 1: [k, s, e, G]
Set 2: [e, f, g, G]
Set 1 intersection Set 2: [e, G]

Note: The returned view performs slightly better when set1 is the smaller of the two sets. If you have reason to believe one of your sets will generally be smaller than the other, pass it first.


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