Given any of the known collection types, this method will return an instance of the collection. - Java java.util

Java examples for java.util:Collection Operation

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Description

Given any of the known collection types, this method will return an instance of the collection.

Demo Code


//package com.java2s;
import java.util.*;
import java.util.concurrent.*;

public class Main {
    public static void main(String[] argv) {
        Class collectionType = String.class;
        System.out.println(getCollection(collectionType));
    }//w  w w  .j  av a  2  s  .com

    /**
     * Given any of the known collection types, this method will return an instance of the collection.
     * @param collectionType    the type of the collection
     * @return the collection instance
     */
    public static Collection<?> getCollection(Class<?> collectionType) {
        if (HashSet.class.equals(collectionType)) {
            return new HashSet<Object>();
        } else if (TreeSet.class.equals(collectionType)) {
            return new TreeSet<Object>();
        } else if (CopyOnWriteArraySet.class.equals(collectionType)) {
            return new CopyOnWriteArraySet<Object>();
        } else if (LinkedHashSet.class.equals(collectionType)) {
            return new LinkedHashSet<Object>();
        } else if (ArrayList.class.equals(collectionType)) {
            return new ArrayList<Object>();
        } else if (LinkedList.class.equals(collectionType)) {
            return new LinkedList<Object>();
        } else if (Vector.class.equals(collectionType)) {
            return new Vector<Object>();
        } else if (Stack.class.equals(collectionType)) {
            return new Stack<Object>();
        } else if (PriorityQueue.class.equals(collectionType)) {
            return new PriorityQueue<Object>();
        } else if (PriorityBlockingQueue.class.equals(collectionType)) {
            return new PriorityBlockingQueue<Object>();
        } else if (ArrayDeque.class.equals(collectionType)) {
            return new ArrayDeque<Object>();
        } else if (ConcurrentLinkedQueue.class.equals(collectionType)) {
            return new ConcurrentLinkedQueue<Object>();
        } else if (LinkedBlockingQueue.class.equals(collectionType)) {
            return new LinkedBlockingQueue<Object>();
        } else if (LinkedBlockingDeque.class.equals(collectionType)) {
            return new LinkedBlockingDeque<Object>();
        } else if (List.class.equals(collectionType)) {
            return new LinkedList<Object>();
        } else if (Set.class.equals(collectionType)) {
            return new HashSet<Object>();
        } else if (Queue.class.equals(collectionType)) {
            return new PriorityQueue<Object>();
        } else if (Deque.class.equals(collectionType)) {
            return new ArrayDeque<Object>();
        } else if (Collection.class.equals(collectionType)) {
            return new LinkedList<Object>();
        }
        throw new IllegalArgumentException("Unsupported collection type: "
                + collectionType);
    }
}

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