Java Array Last Index Of lastIndexOf(final Object[] array, final Object objectToFind)

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  5. lastIndexOf(final Object[] array, final Object objectToFind)

Description

Find the last index of the given object within the array.

License

Apache License

Parameter

Parameter Description
array the array to travers backwords looking for the object, may be <code>null</code>
objectToFind the object to find, may be <code>null</code>

Return

the last index of the object within the array, -1 if not found or null array input

Declaration 

public static int lastIndexOf(final Object[] array,
        final Object objectToFind)

Method Source Code

//package com.java2s;
/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002-2003 The Apache Software Foundation.  All rights
 * reserved.//www .  j  a  v a  2s . co  m
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. 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.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowledgement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgement may appear in the software itself,
 *    if and wherever such third-party acknowledgements normally appear.
 *
 * 4. The names "The Jakarta Project", "Commons", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
 * ITS 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

public class Main {
    /**
     * <p>
     * Find the last index of the given object within the array.
     * </p>
     * 
     * <p>
     * This method returns <code>-1</code> if <code>null</code> array input.
     * </p>
     * 
     * @param array
     *            the array to travers backwords looking for the object, may be
     *            <code>null</code>
     * @param objectToFind
     *            the object to find, may be <code>null</code>
     * @return the last index of the object within the array, <code>-1</code>
     *         if not found or <code>null</code> array input
     */
    public static int lastIndexOf(final Object[] array,
            final Object objectToFind) {
        return lastIndexOf(array, objectToFind, Integer.MAX_VALUE);
    }

    /**
     * <p>
     * Find the last index of the given object in the array starting at the
     * given index.
     * </p>
     * 
     * <p>
     * This method returns <code>-1</code> if <code>null</code> array input.
     * </p>
     * 
     * <p>
     * A negative startIndex will return <code>-1</code>. A startIndex larger
     * than the array length will search from the end of the array.
     * </p>
     * 
     * @param array
     *            the array to traverse for looking for the object, may be
     *            <code>null</code>
     * @param objectToFind
     *            the object to find, may be <code>null</code>
     * @param startIndex
     *            the start index to travers backwards from
     * @return the last index of the object within the array, <code>-1</code>
     *         if not found or <code>null</code> array input
     */
    public static int lastIndexOf(final Object[] array,
            final Object objectToFind, int startIndex) {
        if (array == null) {
            return -1;
        }
        if (startIndex < 0) {
            return -1;
        } else if (startIndex >= array.length) {
            startIndex = array.length - 1;
        }
        if (objectToFind == null) {
            for (int i = startIndex; i >= 0; i--) {
                if (array[i] == null) {
                    return i;
                }
            }
        } else {
            for (int i = startIndex; i >= 0; i--) {
                if (objectToFind.equals(array[i])) {
                    return i;
                }
            }
        }
        return -1;
    }

    /**
     * <p>
     * Find the last index of the given value within the array.
     * </p>
     * 
     * <p>
     * This method returns <code>-1</code> if <code>null</code> array input.
     * </p>
     * 
     * @param array
     *            the array to travers backwords looking for the object, may be
     *            <code>null</code>
     * @param valueToFind
     *            the object to find
     * @return the last index of the value within the array, <code>-1</code>
     *         if not found or <code>null</code> array input
     */
    public static int lastIndexOf(final long[] array, final long valueToFind) {
        return lastIndexOf(array, valueToFind, Integer.MAX_VALUE);
    }

    /**
     * <p>
     * Find the last index of the given value in the array starting at the given
     * index.
     * </p>
     * 
     * <p>
     * This method returns <code>-1</code> if <code>null</code> array input.
     * </p>
     * 
     * <p>
     * A negative startIndex will return -1. A startIndex larger than the array
     * length will search from the end of the array.
     * </p>
     * 
     * @param array
     *            the array to traverse for looking for the object, may be
     *            <code>null</code>
     * @param valueToFind
     *            the value to find
     * @param startIndex
     *            the start index to travers backwards from
     * @return the last index of the value within the array, <code>-1</code>
     *         if not found or <code>null</code> array input
     */
    public static int lastIndexOf(final long[] array,
            final long valueToFind, int startIndex) {
        if (array == null) {
            return -1;
        }
        if (startIndex < 0) {
            return -1;
        } else if (startIndex >= array.length) {
            startIndex = array.length - 1;
        }
        for (int i = startIndex; i >= 0; i--) {
            if (valueToFind == array[i]) {
                return i;
            }
        }
        return -1;
    }

    /**
     * <p>
     * Find the last index of the given value within the array.
     * </p>
     * 
     * <p>
     * This method returns <code>-1</code> if <code>null</code> array input.
     * </p>
     * 
     * @param array
     *            the array to travers backwords looking for the object, may be
     *            <code>null</code>
     * @param valueToFind
     *            the object to find
     * @return the last index of the value within the array, <code>-1</code>
     *         if not found or <code>null</code> array input
     */
    public static int lastIndexOf(final int[] array, final int valueToFind) {
        return lastIndexOf(array, valueToFind, Integer.MAX_VALUE);
    }

    /**
     * <p>
     * Find the last index of the given value in the array starting at the given
     * index.
     * </p>
     * 
     * <p>
     * This method returns <code>-1</code> if <code>null</code> array input.
     * </p>
     * 
     * <p>
     * A negative startIndex will return -1. A startIndex larger than the array
     * length will search from the end of the array.
     * </p>
     * 
     * @param array
     *            the array to traverse for looking for the object, may be
     *            <code>null</code>
     * @param valueToFind
     *            the value to find
     * @param startIndex
     *            the start index to travers backwards from
     * @return the last index of the value within the array, <code>-1</code>
     *         if not found or <code>null</code> array input
     */
    public static int lastIndexOf(final int[] array, final int valueToFind,
            int startIndex) {
        if (array == null) {
            return -1;
        }
        if (startIndex < 0) {
            return -1;
        } else if (startIndex >= array.length) {
            startIndex = array.length - 1;
        }
        for (int i = startIndex; i >= 0; i--) {
            if (valueToFind == array[i]) {
                return i;
            }
        }
        return -1;
    }

    /**
     * <p>
     * Find the last index of the given value within the array.
     * </p>
     * 
     * <p>
     * This method returns <code>-1</code> if <code>null</code> array input.
     * </p>
     * 
     * @param array
     *            the array to travers backwords looking for the object, may be
     *            <code>null</code>
     * @param valueToFind
     *            the object to find
     * @return the last index of the value within the array, <code>-1</code>
     *         if not found or <code>null</code> array input
     */
    public static int lastIndexOf(final short[] array,
            final short valueToFind) {
        return lastIndexOf(array, valueToFind, Integer.MAX_VALUE);
    }

    /**
     * <p>
     * Find the last index of the given value in the array starting at the given
     * index.
     * </p>
     * 
     * <p>
     * This method returns <code>-1</code> if <code>null</code> array input.
     * </p>
     * 
     * <p>
     * A negative startIndex will return -1. A startIndex larger than the array
     * length will search from the end of the array.
     * </p>
     * 
     * @param array
     *            the array to traverse for looking for the object, may be
     *            <code>null</code>
     * @param valueToFind
     *            the value to find
     * @param startIndex
     *            the start index to travers backwards from
     * @return the last index of the value within the array, <code>-1</code>
     *         if not found or <code>null</code> array input
     */
    public static int lastIndexOf(final short[] array,
            final short valueToFind, int startIndex) {
        if (array == null) {
            return -1;
        }
        if (startIndex < 0) {
            return -1;
        } else if (startIndex >= array.length) {
            startIndex = array.length - 1;
        }
        for (int i = startIndex; i >= 0; i--) {
            if (valueToFind == array[i]) {
                return i;
            }
        }
        return -1;
    }

    /**
     * <p>
     * Find the last index of the given value within the array.
     * </p>
     * 
     * <p>
     * This method returns <code>-1</code> if <code>null</code> array input.
     * </p>
     * 
     * @param array
     *            the array to travers backwords looking for the object, may be
     *            <code>null</code>
     * @param valueToFind
     *            the object to find
     * @return the last index of the value within the array, <code>-1</code>
     *         if not found or <code>null</code> array input
     */
    public static int lastIndexOf(final byte[] array, final byte valueToFind) {
        return lastIndexOf(array, valueToFind, Integer.MAX_VALUE);
    }

    /**
     * <p>
     * Find the last index of the given value in the array starting at the given
     * index.
     * </p>
     * 
     * <p>
     * This method returns <code>-1</code> if <code>null</code> array input.
     * </p>
     * 
     * <p>
     * A negative startIndex will return -1. A startIndex larger than the array
     * length will search from the end of the array.
     * </p>
     * 
     * @param array
     *            the array to traverse for looking for the object, may be
     *            <code>null</code>
     * @param valueToFind
     *            the value to find
     * @param startIndex
     *            the start index to travers backwards from
     * @return the last index of the value within the array, <code>-1</code>
     *         if not found or <code>null</code> array input
     */
    public static int lastIndexOf(final byte[] array,
            final byte valueToFind, int startIndex) {
        if (array == null) {
            return -1;
        }
        if (startIndex < 0) {
            return -1;
        } else if (startIndex >= array.length) {
            startIndex = array.length - 1;
        }
        for (int i = startIndex; i >= 0; i--) {
            if (valueToFind == array[i]) {
                return i;
            }
        }
        return -1;
    }

    /**
     * <p>
     * Find the last index of the given value within the array.
     * </p>
     * 
     * <p>
     * This method returns <code>-1</code> if <code>null</code> array input.
     * </p>
     * 
     * @param array
     *            the array to travers backwords looking for the object, may be
     *            <code>null</code>
     * @param valueToFind
     *            the object to find
     * @return the last index of the value within the array, <code>-1</code>
     *         if not found or <code>null</code> array input
     */
    public static int lastIndexOf(final double[] array,
            final double valueToFind) {
        return lastIndexOf(array, valueToFind, Integer.MAX_VALUE);
    }

    /**
     * <p>
     * Find the last index of the given value within a given tolerance in the
     * array. This method will return the index of the last value which falls
     * between the region defined by valueToFind - tolerance and valueToFind +
     * tolerance.
     * </p>
     * 
     * <p>
     * This method returns <code>-1</code> if <code>null</code> array input.
     * </p>
     * 
     * @param array
     *            the array to search through for the object, may be
     *            <code>null</code>
     * @param valueToFind
     *            the value to find
     * @param tolerance
     *            tolerance of the search
     * @return the index of the value within the array, <code>-1</code> if not
     *         found or <code>null</code> array input
     */
    public static int lastIndexOf(final double[] array,
            final double valueToFind, final double tolerance) {
        return lastIndexOf(array, valueToFind, Integer.MAX_VALUE, tolerance);
    }

    /**
     * <p>
     * Find the last index of the given value in the array starting at the given
     * index.
     * </p>
     * 
     * <p>
     * This method returns <code>-1</code> if <code>null</code> array input.
     * </p>
     * 
     * <p>
     * A negative startIndex will return -1. A startIndex larger than the array
     * length will search from the end of the array.
     * </p>
     * 
     * @param array
     *            the array to traverse for looking for the object, may be
     *            <code>null</code>
     * @param valueToFind
     *            the value to find
     * @param startIndex
     *            the start index to travers backwards from
     * @return the last index of the value within the array, <code>-1</code>
     *         if not found or <code>null</code> array input
     */
    public static int lastIndexOf(final double[] array,
            final double valueToFind, int startIndex) {
        if (array == null || array.length == 0) {
            return -1;
        }
        if (startIndex < 0) {
            return -1;
        } else if (startIndex >= array.length) {
            startIndex = array.length - 1;
        }
        for (int i = startIndex; i >= 0; i--) {
            if (valueToFind == array[i]) {
                return i;
            }
        }
        return -1;
    }

    /**
     * <p>
     * Find the last index of the given value in the array starting at the given
     * index. This method will return the index of the last value which falls
     * between the region defined by valueToFind - tolerance and valueToFind +
     * tolerance.
     * </p>
     * 
     * <p>
     * This method returns <code>-1</code> if <code>null</code> array input.
     * </p>
     * 
     * <p>
     * A negative startIndex will return -1. A startIndex larger than the array
     * length will search from the end of the array.
     * </p>
     * 
     * @param array
     *            the array to traverse for looking for the object, may be
     *            <code>null</code>
     * @param valueToFind
     *            the value to find
     * @param startIndex
     *            the start index to travers backwards from
     * @param tolerance
     *            search for value within plus/minus this amount
     * @return the last index of the value within the array, <code>-1</code>
     *         if not found or <code>null</code> array input
     */
    public static int lastIndexOf(final double[] array,
            final double valueToFind, int startIndex, double tolerance) {
        if (array == null || array.length == 0) {
            return -1;
        }
        if (startIndex < 0) {
            return -1;
        } else if (startIndex >= array.length) {
            startIndex = array.length - 1;
        }
        double min = valueToFind - tolerance;
        double max = valueToFind + tolerance;
        for (int i = startIndex; i >= 0; i--) {
            if (array[i] >= min && array[i] <= max) {
                return i;
            }
        }
        return -1;
    }

    /**
     * <p>
     * Find the last index of the given value within the array.
     * </p>
     * 
     * <p>
     * This method returns <code>-1</code> if <code>null</code> array input.
     * </p>
     * 
     * @param array
     *            the array to travers backwords looking for the object, may be
     *            <code>null</code>
     * @param valueToFind
     *            the object to find
     * @return the last index of the value within the array, <code>-1</code>
     *         if not found or <code>null</code> array input
     */
    public static int lastIndexOf(final float[] array,
            final float valueToFind) {
        return lastIndexOf(array, valueToFind, Integer.MAX_VALUE);
    }

    /**
     * <p>
     * Find the last index of the given value in the array starting at the given
     * index.
     * </p>
     * 
     * <p>
     * This method returns <code>-1</code> if <code>null</code> array input.
     * </p>
     * 
     * <p>
     * A negative startIndex will return -1. A startIndex larger than the array
     * length will search from the end of the array.
     * </p>
     * 
     * @param array
     *            the array to traverse for looking for the object, may be
     *            <code>null</code>
     * @param valueToFind
     *            the value to find
     * @param startIndex
     *            the start index to travers backwards from
     * @return the last index of the value within the array, <code>-1</code>
     *         if not found or <code>null</code> array input
     */
    public static int lastIndexOf(final float[] array,
            final float valueToFind, int startIndex) {
        if (array == null || array.length == 0) {
            return -1;
        }
        if (startIndex < 0) {
            return -1;
        } else if (startIndex >= array.length) {
            startIndex = array.length - 1;
        }
        for (int i = startIndex; i >= 0; i--) {
            if (valueToFind == array[i]) {
                return i;
            }
        }
        return -1;
    }

    /**
     * <p>
     * Find the last index of the given value within the array.
     * </p>
     * 
     * <p>
     * This method returns <code>-1</code> if <code>null</code> array input.
     * </p>
     * 
     * @param array
     *            the array to travers backwords looking for the object, may be
     *            <code>null</code>
     * @param valueToFind
     *            the object to find
     * @return the last index of the value within the array, <code>-1</code>
     *         if not found or <code>null</code> array input
     */
    public static int lastIndexOf(final boolean[] array,
            final boolean valueToFind) {
        return lastIndexOf(array, valueToFind, Integer.MAX_VALUE);
    }

    /**
     * <p>
     * Find the last index of the given value in the array starting at the given
     * index.
     * </p>
     * 
     * <p>
     * This method returns <code>-1</code> if <code>null</code> array input.
     * </p>
     * 
     * <p>
     * A negative startIndex will return -1. A startIndex larger than the array
     * length will search from the end of the array.
     * </p>
     * 
     * @param array
     *            the array to traverse for looking for the object, may be
     *            <code>null</code>
     * @param valueToFind
     *            the value to find
     * @param startIndex
     *            the start index to travers backwards from
     * @return the last index of the value within the array, <code>-1</code>
     *         if not found or <code>null</code> array input
     */
    public static int lastIndexOf(final boolean[] array,
            final boolean valueToFind, int startIndex) {
        if (array == null || array.length == 0) {
            return -1;
        }
        if (startIndex < 0) {
            return -1;
        } else if (startIndex >= array.length) {
            startIndex = array.length - 1;
        }
        for (int i = startIndex; i >= 0; i--) {
            if (valueToFind == array[i]) {
                return i;
            }
        }
        return -1;
    }
}

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  4. lastIndexOf(final byte[] str, int startIndex, int endIndex, final byte ch)
  5. lastIndexOf(final char[] source, final int start, final int end, final char ch)
  6. lastIndexOf(int[] array, int intToFind)
  7. lastIndexOf(int[] array, int valueToFind)
  8. lastIndexOf(Object o, Object[] vals)
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