Sorts an array of objects that implement the comparable interface. - Java Reflection

Java examples for Reflection:Interface

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Description

Sorts an array of objects that implement the comparable interface.

Demo Code

/**/*ww  w. ja  v a2s . c  o m*/
 * Helios, OpenSource Monitoring
 * Brought to you by the Helios Development Group
 *
 * Copyright 2007, Helios Development Group and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org. 
 *
 */
//package com.java2s;

import java.lang.reflect.Array;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class Main {
    public static void main(String[] argv) throws Exception {
        Object args = "java2s.com";
        System.out.println(java.util.Arrays.toString(sortArray(args)));
    }

    /**
     * Sorts an array of objects that implement the comparable interface.
     * @param args An array of objects.
     * @return An array of objects sorted by their natural order.
     */
    @SuppressWarnings("unchecked")
    public static Object[] sortArray(Object... args) {
        List<Comparable> list = new ArrayList<Comparable>(args.length);
        for (Object o : args) {
            list.add((Comparable) o);
        }
        Collections.sort(list);
        return list.toArray(new Object[list.size()]);
    }

    /**
     * Sorts an array of objects that implement the comparable interface and returns a typed array specified by the class passed.
     * @param arrayType
     * @param args
     * @return An array of objects sorted by their natural order.
     */
    @SuppressWarnings("unchecked")
    public static Object sortArray(Class arrayType, Object... args) {
        List<Comparable> list = new ArrayList<Comparable>(args.length);
        for (Object o : args) {
            list.add((Comparable) o);
        }
        Collections.sort(list);
        Object arrObject = Array.newInstance(arrayType, list.size());
        for (int i = 0; i < list.size(); i++) {
            Array.set(arrObject, i, list.get(i));
        }
        return arrObject;
    }
}

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