Returns the minimum value in an array. : Array Sort Search « Collections « Java Tutorial

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/*
 * 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.
 */


/**
 * Provides extra functionality for Java Number classes.
 *
 * @author <a href="mailto:rand_mcneely@yahoo.com">Rand McNeely</a>
 * @author Stephen Colebourne
 * @author <a href="mailto:steve.downey@netfolio.com">Steve Downey</a>
 * @author Eric Pugh
 * @author Phil Steitz
 * @author Matthew Hawthorne
 * @author <a href="mailto:ggregory@seagullsw.com">Gary Gregory</a>
 * @author <a href="mailto:fredrik@westermarck.com">Fredrik Westermarck</a>
 * @since 2.0
 * @version $Id: NumberUtils.java 609475 2008-01-06 23:58:59Z bayard $
 */
public class Main {
  
  /**
   * Returns the minimum value in an array.
   * 
   * @param array  an array, must not be null or empty
   * @return the minimum value in the array
   * @throws IllegalArgumentException if <code>array</code> is <code>null</code>
   * @throws IllegalArgumentException if <code>array</code> is empty
   */
  public static long min(long[] array) {
      // Validates input
      if (array == null) {
          throw new IllegalArgumentException("The Array must not be null");
      } else if (array.length == 0) {
          throw new IllegalArgumentException("Array cannot be empty.");
      }
  
      // Finds and returns min
      long min = array[0];
      for (int i = 1; i < array.length; i++) {
          if (array[i] < min) {
              min = array[i];
          }
      }
  
      return min;
  }

}