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Java example source code file (DoubleArray.java)
The DoubleArray.java Java example source code/*
* 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 org.apache.commons.math3.util;
/**
* Provides a standard interface for double arrays. Allows different
* array implementations to support various storage mechanisms
* such as automatic expansion, contraction, and array "rolling".
*
*/
public interface DoubleArray {
/**
* Returns the number of elements currently in the array. Please note
* that this may be different from the length of the internal storage array.
*
* @return number of elements
*/
int getNumElements();
/**
* Returns the element at the specified index. Note that if an
* out of bounds index is supplied a ArrayIndexOutOfBoundsException
* will be thrown.
*
* @param index index to fetch a value from
* @return value stored at the specified index
* @throws ArrayIndexOutOfBoundsException if <code>index is less than
* zero or is greater than <code>getNumElements() - 1.
*/
double getElement(int index);
/**
* Sets the element at the specified index. If the specified index is greater than
* <code>getNumElements() - 1, the
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