Sets difference() function | Guava | Java

Guava’s Sets.difference() returns an unmodifiable view of the difference of two sets.

Syntax:

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

Return Value: This method returns a set containing all elements that are contained by set1 and not contained by set2.



Note: Set2 may also contain elements not present in set1, these are simply ignored. The iteration order of the returned set matches that of set1.

Example 1:

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// Java code to show implementation of
// Guava's Sets.difference() 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 named set1
        Set<Integer>
            set1 = Sets.newHashSet(1, 2, 3, 4, 5, 6);
  
        // Creating second set named set2
        Set<Integer>
            set2 = Sets.newHashSet(1, 3, 5, 7);
  
        // Using Guava's Sets.difference() method
        Set<Integer>
            diff = Sets.difference(set1, set2);
  
        // Displaying the unmodifiable view of
        // the difference of two sets.
        System.out.println("Set 1: "
                           + set1);
        System.out.println("Set 2: "
                           + set2);
        System.out.println("Difference between "
                           + "Set 1 and Set 2: "
                           + diff);
    }
}

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Output:

Set 1: [1, 2, 3, 4, 5, 6]
Set 2: [1, 3, 5, 7]
Difference between Set 1 and Set 2: [2, 4, 6]

Example 2 :

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// Java code to show implementation of
// Guava's Sets.difference() 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 named set1
        Set<String>
            set1 = Sets
                       .newHashSet("H", "E", "L", "L", "O", "G");
  
        // Creating second set named set2
        Set<String>
            set2 = Sets
                       .newHashSet("L", "I", "K", "E", "G");
  
        // Using Guava's Sets.difference() method
        Set<String>
            diff = Sets.difference(set1, set2);
  
        // Displaying the unmodifiable view of
        // the difference of two sets.
        System.out.println("Set 1: "
                           + set1);
        System.out.println("Set 2: "
                           + set2);
        System.out.println("Difference between "
                           + "Set 1 and Set 2: "
                           + diff);
    }
}

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Output:

Set 1: [E, G, H, L, O]
Set 2: [I, K, L, E, G]
Difference between Set 1 and Set 2: [H, O]


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