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Java example source code file (SetUtils.java)

This example Java source code file (SetUtils.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

collection, hashset, set, setutils, util

The SetUtils.java Java example source code

/*
 *
 *  * Copyright 2015 Skymind,Inc.
 *  *
 *  *    Licensed under the Apache License, Version 2.0 (the "License");
 *  *    you may not use this file except in compliance with the License.
 *  *    You may obtain a copy of the License at
 *  *
 *  *        http://www.apache.org/licenses/LICENSE-2.0
 *  *
 *  *    Unless required by applicable law or agreed to in writing, software
 *  *    distributed under the License is distributed on an "AS IS" BASIS,
 *  *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  *    See the License for the specific language governing permissions and
 *  *    limitations under the License.
 *
 */

package org.deeplearning4j.util;

import java.util.Collection;
import java.util.HashSet ;
import java.util.Set ;

public class SetUtils
{
	private SetUtils() {}

	// Set specific operations

	public static <T> Set intersection(Collection parentCollection, Collection removeFromCollection)
	{
		Set<T> results = new HashSet(parentCollection) ;
		results.retainAll(removeFromCollection) ;
		return results ;
	}

	public static <T> boolean intersectionP(Set s1, Set s2)
	{
		for( T elt : s1 )
		{
			if ( s2.contains(elt) ) 
				return true ;
		}
		return false ;
	}

	public static <T> Set union(Set s1, Set s2)
	{
		Set<T> s3 = new HashSet(s1) ;
		s3.addAll(s2) ;
		return s3 ;
	}

	/** Return is s1 \ s2 */

	public static <T> Set difference(Collection s1, Collection s2)
	{
		Set<T> s3 = new HashSet(s1) ;
		s3.removeAll(s2) ;
		return s3 ;
	}
}


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