Reverses the order of the given array. - Android java.lang

Description

Reverses the order of the given array.

Demo Code

/*//  w w  w  .  j a  v a 2  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;

public class Main {
    /**
     * <p>Reverses the order of the given array.</p>
     *
     * <p>There is no special handling for multi-dimensional arrays.</p>
     *
     * <p>This method does nothing for a {@code null} input array.</p>
     *
     * @param array  the array to reverse, may be {@code null}
     */
    public static void reverse(final Object[] array) {
        if (array == null) {
            return;
        }
        reverse(array, 0, array.length);
    }

    /**
     * <p>Reverses the order of the given array.</p>
     *
     * <p>This method does nothing for a {@code null} input array.</p>
     *
     * @param array  the array to reverse, may be {@code null}
     */
    public static void reverse(final long[] array) {
        if (array == null) {
            return;
        }
        reverse(array, 0, array.length);
    }

    /**
     * <p>Reverses the order of the given array.</p>
     *
     * <p>This method does nothing for a {@code null} input array.</p>
     *
     * @param array  the array to reverse, may be {@code null}
     */
    public static void reverse(final int[] array) {
        if (array == null) {
            return;
        }
        reverse(array, 0, array.length);
    }

    /**
     * <p>Reverses the order of the given array.</p>
     *
     * <p>This method does nothing for a {@code null} input array.</p>
     *
     * @param array  the array to reverse, may be {@code null}
     */
    public static void reverse(final short[] array) {
        if (array == null) {
            return;
        }
        reverse(array, 0, array.length);
    }

    /**
     * <p>Reverses the order of the given array.</p>
     *
     * <p>This method does nothing for a {@code null} input array.</p>
     *
     * @param array  the array to reverse, may be {@code null}
     */
    public static void reverse(final char[] array) {
        if (array == null) {
            return;
        }
        reverse(array, 0, array.length);
    }

    /**
     * <p>Reverses the order of the given array.</p>
     *
     * <p>This method does nothing for a {@code null} input array.</p>
     *
     * @param array  the array to reverse, may be {@code null}
     */
    public static void reverse(final byte[] array) {
        if (array == null) {
            return;
        }
        reverse(array, 0, array.length);
    }

    /**
     * <p>Reverses the order of the given array.</p>
     *
     * <p>This method does nothing for a {@code null} input array.</p>
     *
     * @param array  the array to reverse, may be {@code null}
     */
    public static void reverse(final double[] array) {
        if (array == null) {
            return;
        }
        reverse(array, 0, array.length);
    }

    /**
     * <p>Reverses the order of the given array.</p>
     *
     * <p>This method does nothing for a {@code null} input array.</p>
     *
     * @param array  the array to reverse, may be {@code null}
     */
    public static void reverse(final float[] array) {
        if (array == null) {
            return;
        }
        reverse(array, 0, array.length);
    }

    /**
     * <p>Reverses the order of the given array.</p>
     *
     * <p>This method does nothing for a {@code null} input array.</p>
     *
     * @param array  the array to reverse, may be {@code null}
     */
    public static void reverse(final boolean[] array) {
        if (array == null) {
            return;
        }
        reverse(array, 0, array.length);
    }

    /**
     * <p>
     * Reverses the order of the given array in the given range.
     * </p>
     * 
     * <p>
     * This method does nothing for a {@code null} input array.
     * </p>
     * 
     * @param array
     *            the array to reverse, may be {@code null}
     * @param startIndexInclusive
     *            the starting index. Undervalue (&lt;0) is promoted to 0, overvalue (&gt;array.length) results in no
     *            change.
     * @param endIndexExclusive
     *            elements up to endIndex-1 are reversed in the array. Undervalue (&lt; start index) results in no
     *            change. Overvalue (&gt;array.length) is demoted to array length.
     * @since 3.2
     */
    public static void reverse(final boolean[] array,
            final int startIndexInclusive, final int endIndexExclusive) {
        if (array == null) {
            return;
        }
        int i = startIndexInclusive < 0 ? 0 : startIndexInclusive;
        int j = Math.min(array.length, endIndexExclusive) - 1;
        boolean tmp;
        while (j > i) {
            tmp = array[j];
            array[j] = array[i];
            array[i] = tmp;
            j--;
            i++;
        }
    }

    /**
     * <p>
     * Reverses the order of the given array in the given range.
     * </p>
     * 
     * <p>
     * This method does nothing for a {@code null} input array.
     * </p>
     * 
     * @param array
     *            the array to reverse, may be {@code null}
     * @param startIndexInclusive
     *            the starting index. Undervalue (&lt;0) is promoted to 0, overvalue (&gt;array.length) results in no
     *            change.
     * @param endIndexExclusive
     *            elements up to endIndex-1 are reversed in the array. Undervalue (&lt; start index) results in no
     *            change. Overvalue (&gt;array.length) is demoted to array length.
     * @since 3.2
     */
    public static void reverse(final byte[] array,
            final int startIndexInclusive, final int endIndexExclusive) {
        if (array == null) {
            return;
        }
        int i = startIndexInclusive < 0 ? 0 : startIndexInclusive;
        int j = Math.min(array.length, endIndexExclusive) - 1;
        byte tmp;
        while (j > i) {
            tmp = array[j];
            array[j] = array[i];
            array[i] = tmp;
            j--;
            i++;
        }
    }

    /**
     * <p>
     * Reverses the order of the given array in the given range.
     * </p>
     * 
     * <p>
     * This method does nothing for a {@code null} input array.
     * </p>
     * 
     * @param array
     *            the array to reverse, may be {@code null}
     * @param startIndexInclusive
     *            the starting index. Undervalue (&lt;0) is promoted to 0, overvalue (&gt;array.length) results in no
     *            change.
     * @param endIndexExclusive
     *            elements up to endIndex-1 are reversed in the array. Undervalue (&lt; start index) results in no
     *            change. Overvalue (&gt;array.length) is demoted to array length.
     * @since 3.2
     */
    public static void reverse(final char[] array,
            final int startIndexInclusive, final int endIndexExclusive) {
        if (array == null) {
            return;
        }
        int i = startIndexInclusive < 0 ? 0 : startIndexInclusive;
        int j = Math.min(array.length, endIndexExclusive) - 1;
        char tmp;
        while (j > i) {
            tmp = array[j];
            array[j] = array[i];
            array[i] = tmp;
            j--;
            i++;
        }
    }

    /**
     * <p>
     * Reverses the order of the given array in the given range.
     * </p>
     * 
     * <p>
     * This method does nothing for a {@code null} input array.
     * </p>
     * 
     * @param array
     *            the array to reverse, may be {@code null}
     * @param startIndexInclusive
     *            the starting index. Undervalue (&lt;0) is promoted to 0, overvalue (&gt;array.length) results in no
     *            change.
     * @param endIndexExclusive
     *            elements up to endIndex-1 are reversed in the array. Undervalue (&lt; start index) results in no
     *            change. Overvalue (&gt;array.length) is demoted to array length.
     * @since 3.2
     */
    public static void reverse(final double[] array,
            final int startIndexInclusive, final int endIndexExclusive) {
        if (array == null) {
            return;
        }
        int i = startIndexInclusive < 0 ? 0 : startIndexInclusive;
        int j = Math.min(array.length, endIndexExclusive) - 1;
        double tmp;
        while (j > i) {
            tmp = array[j];
            array[j] = array[i];
            array[i] = tmp;
            j--;
            i++;
        }
    }

    /**
     * <p>
     * Reverses the order of the given array in the given range.
     * </p>
     * 
     * <p>
     * This method does nothing for a {@code null} input array.
     * </p>
     * 
     * @param array
     *            the array to reverse, may be {@code null}
     * @param startIndexInclusive
     *            the starting index. Undervalue (&lt;0) is promoted to 0, overvalue (&gt;array.length) results in no
     *            change.
     * @param endIndexExclusive
     *            elements up to endIndex-1 are reversed in the array. Undervalue (&lt; start index) results in no
     *            change. Overvalue (&gt;array.length) is demoted to array length.
     * @since 3.2
     */
    public static void reverse(final float[] array,
            final int startIndexInclusive, final int endIndexExclusive) {
        if (array == null) {
            return;
        }
        int i = startIndexInclusive < 0 ? 0 : startIndexInclusive;
        int j = Math.min(array.length, endIndexExclusive) - 1;
        float tmp;
        while (j > i) {
            tmp = array[j];
            array[j] = array[i];
            array[i] = tmp;
            j--;
            i++;
        }
    }

    /**
     * <p>
     * Reverses the order of the given array in the given range.
     * </p>
     * 
     * <p>
     * This method does nothing for a {@code null} input array.
     * </p>
     * 
     * @param array
     *            the array to reverse, may be {@code null}
     * @param startIndexInclusive
     *            the starting index. Undervalue (&lt;0) is promoted to 0, overvalue (&gt;array.length) results in no
     *            change.
     * @param endIndexExclusive
     *            elements up to endIndex-1 are reversed in the array. Undervalue (&lt; start index) results in no
     *            change. Overvalue (&gt;array.length) is demoted to array length.
     * @since 3.2
     */
    public static void reverse(final int[] array,
            final int startIndexInclusive, final int endIndexExclusive) {
        if (array == null) {
            return;
        }
        int i = startIndexInclusive < 0 ? 0 : startIndexInclusive;
        int j = Math.min(array.length, endIndexExclusive) - 1;
        int tmp;
        while (j > i) {
            tmp = array[j];
            array[j] = array[i];
            array[i] = tmp;
            j--;
            i++;
        }
    }

    /**
     * <p>
     * Reverses the order of the given array in the given range.
     * </p>
     * 
     * <p>
     * This method does nothing for a {@code null} input array.
     * </p>
     * 
     * @param array
     *            the array to reverse, may be {@code null}
     * @param startIndexInclusive
     *            the starting index. Undervalue (&lt;0) is promoted to 0, overvalue (&gt;array.length) results in no
     *            change.
     * @param endIndexExclusive
     *            elements up to endIndex-1 are reversed in the array. Undervalue (&lt; start index) results in no
     *            change. Overvalue (&gt;array.length) is demoted to array length.
     * @since 3.2
     */
    public static void reverse(final long[] array,
            final int startIndexInclusive, final int endIndexExclusive) {
        if (array == null) {
            return;
        }
        int i = startIndexInclusive < 0 ? 0 : startIndexInclusive;
        int j = Math.min(array.length, endIndexExclusive) - 1;
        long tmp;
        while (j > i) {
            tmp = array[j];
            array[j] = array[i];
            array[i] = tmp;
            j--;
            i++;
        }
    }

    /**
     * <p>
     * Reverses the order of the given array in the given range.
     * </p>
     * 
     * <p>
     * This method does nothing for a {@code null} input array.
     * </p>
     * 
     * @param array
     *            the array to reverse, may be {@code null}
     * @param startIndexInclusive
     *            the starting index. Undervalue (&lt;0) is promoted to 0, overvalue (&gt;array.length) results in no
     *            change.
     * @param endIndexExclusive
     *            elements up to endIndex-1 are reversed in the array. Undervalue (&lt; start index) results in no
     *            change. Overvalue (&gt;array.length) is demoted to array length.
     * @since 3.2
     */
    public static void reverse(final Object[] array,
            final int startIndexInclusive, final int endIndexExclusive) {
        if (array == null) {
            return;
        }
        int i = startIndexInclusive < 0 ? 0 : startIndexInclusive;
        int j = Math.min(array.length, endIndexExclusive) - 1;
        Object tmp;
        while (j > i) {
            tmp = array[j];
            array[j] = array[i];
            array[i] = tmp;
            j--;
            i++;
        }
    }

    /**
     * <p>
     * Reverses the order of the given array in the given range.
     * </p>
     * 
     * <p>
     * This method does nothing for a {@code null} input array.
     * </p>
     * 
     * @param array
     *            the array to reverse, may be {@code null}
     * @param startIndexInclusive
     *            the starting index. Undervalue (&lt;0) is promoted to 0, overvalue (&gt;array.length) results in no
     *            change.
     * @param endIndexExclusive
     *            elements up to endIndex-1 are reversed in the array. Undervalue (&lt; start index) results in no
     *            change. Overvalue (&gt;array.length) is demoted to array length.
     * @since 3.2
     */
    public static void reverse(final short[] array,
            final int startIndexInclusive, final int endIndexExclusive) {
        if (array == null) {
            return;
        }
        int i = startIndexInclusive < 0 ? 0 : startIndexInclusive;
        int j = Math.min(array.length, endIndexExclusive) - 1;
        short tmp;
        while (j > i) {
            tmp = array[j];
            array[j] = array[i];
            array[i] = tmp;
            j--;
            i++;
        }
    }
}

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