Returns a copy of the given array of size 1 greater than the argument. - Android java.lang

Android examples for java.lang:array copy

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Description

Returns a copy of the given array of size 1 greater than the argument.

Demo Code

/*/*from  w w w  . j  a  v  a2  s .  c o  m*/
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.Array;

public class Main {
    /**
     * Returns a copy of the given array of size 1 greater than the argument.
     * The last value of the array is left to the default value.
     *
     * @param array The array to copy, must not be {@code null}.
     * @param newArrayComponentType If {@code array} is {@code null}, create a
     * size 1 array of this type.
     * @return A new copy of the array of size 1 greater than the input.
     */
    private static Object copyArrayGrow1(final Object array,
            final Class<?> newArrayComponentType) {
        if (array != null) {
            final int arrayLength = Array.getLength(array);
            final Object newArray = Array.newInstance(array.getClass()
                    .getComponentType(), arrayLength + 1);
            System.arraycopy(array, 0, newArray, 0, arrayLength);
            return newArray;
        }
        return Array.newInstance(newArrayComponentType, 1);
    }

    /**
     * <p>Returns the length of the specified array.
     * This method can deal with {@code Object} arrays and with primitive arrays.</p>
     *
     * <p>If the input array is {@code null}, {@code 0} is returned.</p>
     *
     * <pre>
     * ArrayUtils.getLength(null)            = 0
     * ArrayUtils.getLength([])              = 0
     * ArrayUtils.getLength([null])          = 1
     * ArrayUtils.getLength([true, false])   = 2
     * ArrayUtils.getLength([1, 2, 3])       = 3
     * ArrayUtils.getLength(["a", "b", "c"]) = 3
     * </pre>
     *
     * @param array  the array to retrieve the length from, may be null
     * @return The length of the array, or {@code 0} if the array is {@code null}
     * @throws IllegalArgumentException if the object argument is not an array.
     * @since 2.1
     */
    public static int getLength(final Object array) {
        if (array == null) {
            return 0;
        }
        return Array.getLength(array);
    }
}

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