Java Collection Subtract subtract(Collection c1, Collection c2)

Description

c1 - c2, does not change input collections, returns new collection (list)

License

Open Source License

Declaration

public static <T> List<T> subtract(Collection<T> c1, Collection<T> c2) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.util.ArrayList;

import java.util.Collection;
import java.util.Collections;

import java.util.List;

public class Main {
    /**/*w  w  w. j a  va 2 s .  com*/
     * c1 - c2, does not change input collections, returns new collection (list)
     */
    public static <T> List<T> subtract(Collection<T> c1, Collection<T> c2) {
        if (c1 == null) {
            return Collections.emptyList();
        }
        List<T> tmp = new ArrayList<>(c1);
        if (c2 != null) {
            tmp.removeAll(c2);
        }
        return tmp;
    }

    public static <T> List<T> emptyList() {
        return Collections.emptyList();
    }
}

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