Clone a set. - Java java.util

Java examples for java.util:Set Operation

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Description

Clone a set.

Demo Code


//package com.java2s;

import java.util.Collection;
import java.util.LinkedHashSet;

import java.util.Set;

public class Main {
    /**//from  ww w  . j a  v  a  2 s  . co  m
     * Clone a set.
     * <p>
     * It simply copies the source set to a new {@link #LinkedHashSet}.
     * 
     * @param src - Source set
     * @return the LinkedHashSet with copied values.
     */
    public static <T, M extends Set<? extends T>> LinkedHashSet<T> cloneSet(
            M src) {
        return copySet(src, new LinkedHashSet<T>());
    }

    /**
     * Copy a set to another one.
     * 
     * @param src - Source set
     * @param dst - Destination set
     * @return the destination set.
     */
    public static <T, M extends Set<? extends T>, N extends Set<? super T>> N copySet(
            M src, N dst) {
        return copyCollection(src, dst);
    }

    /**
     * Copy a collection to another one.
     * 
     * @param src - Source collection
     * @param dst - Destination collection
     * @return the destination collection.
     */
    public static <T, M extends Collection<? extends T>, N extends Collection<? super T>> N copyCollection(
            M src, N dst) {
        synchronized (src) {
            synchronized (dst) {
                dst.clear();

                for (T element : src)
                    dst.add(element);

                return dst;
            }
        }
    }
}

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