/* * Copyright (c) 1995, 2008, 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. */ import java.lang.reflect.Constructor; import java.lang.reflect.Type; import static java.lang.System.out; public class ConstructorSift { public static void main(String... args) { try { Class cArg = Class.forName(args[1]); Class c = Class.forName(args[0]); Constructor[] allConstructors = c.getDeclaredConstructors(); for (Constructor ctor : allConstructors) { Class[] pType = ctor.getParameterTypes(); for (int i = 0; i < pType.length; i++) { if (pType[i].equals(cArg)) { out.format("%s%n", ctor.toGenericString()); Type[] gpType = ctor.getGenericParameterTypes(); for (int j = 0; j < gpType.length; j++) { char ch = (pType[j].equals(cArg) ? '*' : ' '); out.format("%7c%s[%d]: %s%n", ch, "GenericParameterType", j, gpType[j]); } break; } } } // production code should handle this exception more gracefully } catch (ClassNotFoundException x) { x.printStackTrace(); } } }