Ensures that all elements of the given collection can be cast to a desired type. - Java java.util

Java examples for java.util:Collection Element

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Description

Ensures that all elements of the given collection can be cast to a desired type.

Demo Code


//package com.java2s;
import java.util.Collection;

public class Main {
    public static void main(String[] argv) {
        Collection collection = java.util.Arrays.asList("asdf",
                "java2s.com");
        Class type = String.class;
        System.out.println(checkCollection(collection, type));
    }/*from   www  .j  a va 2 s.c om*/

    /** Indicates whether collection elements should be actually checked. */
    private static final boolean DEBUG = true;

    /**
     * Ensures that all elements of the given collection can be cast to a
     * desired type.
     * 
     * @param collection
     *            the collection to check
     * @param type
     *            the desired type
     * @return a collection of the desired type
     * @throws ClassCastException
     *             if an element cannot be cast to the desired type
     */
    @SuppressWarnings("unchecked")
    public static <E> Collection<E> checkCollection(
            Collection<?> collection, Class<E> type) {
        if (DEBUG) {
            for (Object element : collection) {
                type.cast(element);
            }
        }
        return (Collection<E>) collection;
    }
}

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