ConstructorTroubleAgain.java Source code

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Here is the source code for ConstructorTroubleAgain.java

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/*
 * Copyright (c) 1995 - 2008 Sun Microsystems, Inc.  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 Sun Microsystems nor 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.
 */

import static java.lang.System.out;

import java.lang.reflect.InvocationTargetException;

public class ConstructorTroubleAgain {
    public ConstructorTroubleAgain() {
    }

    public ConstructorTroubleAgain(Integer i) {
    }

    public ConstructorTroubleAgain(Object o) {
        out.format("Constructor passed Object%n");
    }

    public ConstructorTroubleAgain(String s) {
        out.format("Constructor passed String%n");
    }

    public static void main(String... args) {
        String argType = (args.length == 0 ? "" : args[0]);
        try {
            Class<?> c = Class.forName("ConstructorTroubleAgain");
            if ("".equals(argType)) {
                // IllegalArgumentException: wrong number of arguments
                Object o = c.getConstructor().newInstance("foo");
            } else if ("int".equals(argType)) {
                // NoSuchMethodException - looking for int, have Integer
                Object o = c.getConstructor(int.class);
            } else if ("Object".equals(argType)) {
                // newInstance() does not perform method resolution
                Object o = c.getConstructor(Object.class).newInstance("foo");
            } else {
                assert false;
            }

            // production code should handle these exceptions more gracefully
        } catch (ClassNotFoundException x) {
            x.printStackTrace();
        } catch (NoSuchMethodException x) {
            x.printStackTrace();
        } catch (InvocationTargetException x) {
            x.printStackTrace();
        } catch (InstantiationException x) {
            x.printStackTrace();
        } catch (IllegalAccessException x) {
            x.printStackTrace();
        }
    }
}