Create Generic Box class - Java Object Oriented Design

Java examples for Object Oriented Design:Generic Class

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Description

Create Generic Box class

Demo Code

/**/*  ww w  . j a v  a 2  s  .c  o  m*/
 * Generic version of the Box class.
 * @param <T> the type of value being boxed
 */
class Box<T> {

    private T t; // T stands for "Type"          

    public void set(T t) {
        this.t = t;
    }

    public T get() {
        return t;
    }
}

public class BoxDemo {

    public static <U> void addBox(U u, java.util.List<Box<U>> boxes) {
        Box<U> box = new Box<>();
        box.set(u);
        boxes.add(box);
    }

    public static <U> void outputBoxes(java.util.List<Box<U>> boxes) {
        int counter = 0;
        for (Box<U> box : boxes) {
            U boxContents = box.get();
            System.out.println("Box #" + counter + " contains ["
                    + boxContents.toString() + "]");
            counter++;
        }
    }

    public static void main(String[] args) {
        java.util.ArrayList<Box<Integer>> listOfIntegerBoxes = new java.util.ArrayList<>();
        BoxDemo.<Integer> addBox(Integer.valueOf(10), listOfIntegerBoxes);
        BoxDemo.addBox(Integer.valueOf(20), listOfIntegerBoxes);
        BoxDemo.addBox(Integer.valueOf(30), listOfIntegerBoxes);
        BoxDemo.outputBoxes(listOfIntegerBoxes);
    }
}

/*
 * Copyright (c) 1995, 2010, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle or the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

Result


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