Java example source code file (Test6422403.java)

This example Java source code file (Test6422403.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

bean, child, class, error, grand, javabean, long, number, parent, propertydescriptor, string, test6422403

The Test6422403.java Java example source code

/*
 * Copyright (c) 2007, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/*
 * @test
 * @bug 6422403
 * @summary Tests property types for generics
 * @author Sergey Malenkov
 */

import java.beans.PropertyDescriptor;

public class Test6422403 {
    public static void main(String[] args) {
        test(Grand.class, "array", new Object[0].getClass());

        test(Parent.class, "array", new Number[0].getClass());
        test(Parent.class, "number", Number.class);

        test(Child.class, "array", new Long[0].getClass());
        test(Child.class, "number", Long.class);
        test(Child.class, "value", Long.class);
    }

    private static void test(Class type, String name, Class expected) {
        PropertyDescriptor pd = BeanUtils.getPropertyDescriptor(type, name);
        if (name.equals(pd.getName()))
            if (!expected.equals(pd.getPropertyType()))
                throw new Error("expected " + expected + " but " + pd.getPropertyType() + " is resolved");
    }

    private static class Grand<A> {
        private A[] array;

        public A[] getArray() {
            return this.array;
        }

        public void setArray(A...array) {
            this.array = array;
        }
    }

    private static class Parent<N extends Number> extends Grand {
        private N number;

        public N getNumber() {
            return this.number;
        }

        public void setNumber(N number) {
            this.number = number;
        }
    }

    private static class Child extends Parent<Long> {
        private Long value;

        public Long getValue() {
            return this.value;
        }

        public void setValue(Long value) {
            this.value = value;
        }
    }
}