is Type an Array Or Collection - Java Collection Framework

Java examples for Collection Framework:Array Element

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Description

is Type an Array Or Collection

Demo Code

/*/*w w  w. jav  a2 s .c o m*/
 * Copyright (c) 2008-2016 Haulmont.
 *
 * 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;

public class Main {
    public static void main(String[] argv) throws Exception {
        String type = "java2s.com";
        System.out.println(isArrayOrCollection(type));
    }

    public static boolean isArrayOrCollection(String type) {
        return isCollection(type) || isArray(type);
    }

    public static boolean isCollection(String type) {
        return isList(type) || isSet(type);
    }

    public static boolean isArray(String type) {
        return type != null
                && (type.startsWith("[") && type.length() >= 2
                        && getArrayType(type) != null || type
                            .endsWith("[]"));
    }

    public static boolean isList(String type) {
        return "java.util.List".equals(type);
    }

    public static boolean isSet(String type) {
        return "java.util.Set".equals(type);
    }

    public static Class getArrayType(String type) {
        if (type.endsWith("[]")) {
            try {
                return Class.forName(type.substring(0, type.length() - 2));
            } catch (ClassNotFoundException e) {
                throw new RuntimeException("Wrong array type");
            }
        }
        switch (type.substring(0, 2)) {
        case "[Z":
            return boolean.class;
        case "[B":
            return byte.class;
        case "[S":
            return short.class;
        case "[I":
            return int.class;
        case "[J":
            return long.class;
        case "[F":
            return float.class;
        case "[D":
            return double.class;
        case "[C":
            return char.class;
        case "[L":
            return Object.class; // any non-primitives(Object)
        }
        throw new RuntimeException("Wrong array type");
    }
}

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