get Constructor from Class - Android java.lang.reflect

Android examples for java.lang.reflect:Constructor

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Description

get Constructor from Class

Demo Code

/*//from w  ww  . ja  va2s.  co  m
 * Copyright 2014-2016 QuickAF
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
//package com.java2s;

import java.lang.reflect.Constructor;

public class Main {

    public static Constructor<?> getConstructor(Class<?> sourceClass,
            boolean isFindDeclaredConstructor, boolean isUpwardFind,
            Class<?>... constructorParameterTypes) {
        Constructor<?> method = null;
        try {
            method = isFindDeclaredConstructor ? sourceClass
                    .getDeclaredConstructor(constructorParameterTypes)
                    : sourceClass.getConstructor(constructorParameterTypes);
        } catch (NoSuchMethodException e1) {
            if (isUpwardFind) {
                Class<?> classs = sourceClass.getSuperclass();
                while (method == null && classs != null) {
                    try {
                        method = isFindDeclaredConstructor ? sourceClass
                                .getDeclaredConstructor(constructorParameterTypes)
                                : sourceClass
                                        .getConstructor(constructorParameterTypes);
                    } catch (NoSuchMethodException e11) {
                        classs = classs.getSuperclass();
                    }
                }
            }
        }
        return method;
    }
}

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