set Intersection for Collection - Java java.util

Java examples for java.util:Collection Operation

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Description

set Intersection for Collection

Demo Code

/*******************************************************************************
 * Copyright (c) 2004, 2007 Boeing./*from w w w .  j  ava 2 s. co m*/
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Boeing - initial API and implementation
 *******************************************************************************/
//package com.java2s;
import java.util.ArrayList;

import java.util.Collection;

import java.util.List;

public class Main {
    public static void main(String[] argv) {
        Collection listA = java.util.Arrays.asList("asdf", "java2s.com");
        Collection listB = java.util.Arrays.asList("asdf", "java2s.com");
        System.out.println(setIntersection(listA, listB));
    }

    /**
     * @return The intersection of two sets A and B is the set of elements common to A and B
     */
    public static <T> List<T> setIntersection(Collection<T> listA,
            Collection<T> listB) {
        ArrayList<T> intersection = new ArrayList<T>(listA.size());

        for (T obj : listA) {
            if (listB.contains(obj)) {
                intersection.add(obj);
            }
        }
        return intersection;
    }
}

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