Example usage for java.util Collections unmodifiableCollection

Introduction

In this page you can find the example usage for java.util Collections unmodifiableCollection.

Prototype

public static <T> Collection<T> unmodifiableCollection(Collection<? extends T> c)

Source Link

Document

Returns an unmodifiable view of the specified collection.

Usage

From source file:Main.java

public static void main(String args[]) {
    List<Character> list = new ArrayList<Character>();

    list.add('X');

    System.out.println("Element added to list: " + list.get(0));

    Collection<Character> immutableCol = Collections.unmodifiableCollection(list);

    immutableCol.add('Y');
}

From source file:Main.java

public static void main(String[] args) {
    // create array list
    List<Character> list = new ArrayList<Character>();

    // populate the list
    list.add('X');
    list.add('Y');

    System.out.println("Initial list: " + list);

    Collection<Character> immutablelist = Collections.unmodifiableCollection(list);

    // try to modify the list
    immutablelist.add('Z');
}

From source file:Main.java

public static <T> Collection<T> unmodifiableCollection(Collection<? extends T> collection) {
    if (collection == null) {
        return Collections.emptyList();
    } else {/*www.jav a2 s  .co  m*/
        return Collections.unmodifiableCollection(collection);
    }
}

From source file:Main.java

/**
 * Converts the specified Array to an unmodifiable Collection containing the same elements.
 *
 * @param source Array of Objects to be converted to an unmodifiable Collection.
 * @return Collection of Objects containing the elements of the specified Array.
 *//*w  ww.j a  v  a2s .  c o  m*/
public static <E> Collection<E> unmodifiableCollection(E... source) {
    return Collections.unmodifiableCollection(Arrays.asList(source));
}

From source file:Main.java

public static <T> Collection<T> unmodifiableCollection(T... ts) {
    return Collections.unmodifiableCollection(Arrays.asList(ts));
}

From source file:Main.java

/**
 * Protect the collection. It returns a unmodifiable view of the given collection. The given collection is not
 * modified./*from  w ww  . java  2 s.c om*/
 *
 * @param collection The collection to protect.
 * @param <T>        The type of value.
 *
 * @return The protected Collection.
 */
public static <T> Collection<T> protect(Collection<T> collection) {
    return Collections.unmodifiableCollection(collection);
}

From source file:Main.java

/**
 * Copies the contents of a Collection to a new, unmodifiable Collection.  If the Collection is null, an empty 
 * Collection will  be returned.//from   w w  w . j av a  2s  .  co  m
 * <p>
 * This is especially useful for methods which take Collection parameters.  Directly assigning such a Collection
 * to a member variable can allow external classes to modify internal state.  Classes may have different state 
 * depending on the size of a Collection; for example, a button might be disabled if the the Collection size is zero.  
 * If an external object can change the Collection, the containing class would have no way have knowing a 
 * modification occurred.
 * 
 * @param <T> The type of element in the Collection.
 * @param collection The Collection to copy.
 * @return A new, unmodifiable Collection which contains all of the elements of the List parameter.  Will never be 
 * null.
 */
public static <T> Collection<T> copyToUnmodifiableCollection(Collection<T> collection) {
    if (collection != null) {
        Collection<T> collectionCopy = new ArrayList(collection);
        return Collections.unmodifiableCollection(collectionCopy);
    } else {
        return Collections.emptyList();
    }
}

From source file:com.technophobia.substeps.runner.syntax.FileUtils.java

public static Collection<File> getFiles(final File fFile, final String extension) {

    //  the parameter might be a dir or a single file
    final Collection<File> files;
    if (fFile.isFile()) {
        List<File> fileList = new ArrayList<>();
        fileList.add(fFile);//w w  w.ja  v  a 2 s  .  com
        files = Collections.unmodifiableCollection(fileList);
    } else {
        files = org.apache.commons.io.FileUtils.listFiles(fFile, new String[] { extension }, true);
    }

    return files;
}

From source file:ch.rasc.s4ws.snake.SnakeTimer.java

protected static Collection<Snake> getSnakes() {
    return Collections.unmodifiableCollection(snakes.values());
}

From source file:com.gmind7.bakery.websocket.SnakeTimer.java

public static Collection<Snake> getSnakes() {
    return Collections.unmodifiableCollection(snakes.values());
}