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How to create empty set using Collections class?


The java.util.Collections class consists exclusively of static methods that operate on or return collections. It contains polymorphic algorithms that operate on collections, “wrappers”, which return a new collection backed by a specified collection, and a few other odds and ends.

Collections.emptySet() method will returns the empty set (immutable).
Syntax: public static final Set emptySet()

Example

package com.codesjava;
 
import java.util.Collections;
import java.util.Set;
 
public class Test { 
    public static void main(String a[]){         
        Set<String> set = Collections.<String>emptySet();
        System.out.println("Empty set: "+set);
    }
}

Output

Empty set: []

Java Collections class examples



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