Java冒泡排序算法

Posted 2022-05-31 袁慎建@ThoughtWorks

Java冒泡排序算法 冒泡排序算法详解： http://blog.csdn.net/ysjian_pingcx/article/details/8653732 冒泡排序算法源码免积分下载： http://download.csdn.net/detail/ysjian_pingcx/6755209
序：一个爱上Java最初的想法一直没有磨灭：”分享我的学习成果，不管后期技术有多深，打好基础很重要“。
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工具类Swapper，后期算法会使用这个工具类：

package com.meritit.sortord.util;

/**
 * One util to swap tow element of Array
 * 
 * @author ysjian
 * @version 1.0
 * @email [e-mail]
 * @QQ 646633781
 * @telephone [phone]
 * @csdnBlog http://blog.csdn.net/ysjian_pingcx
 * @createTime 2013-12-20
 * @copyRight Merit
 */
public class Swapper 

	private Swapper() 

	

	/**
	 * Swap tow elements of the array
	 * 
	 * @param oneIndex
	 *            one index
	 * @param anotherIndex
	 *            another index
	 * @param array
	 *            the array to be swapped
	 * @exception NullPointerException
	 *                if the array is null
	 */
	public static <T extends Comparable<T>> void swap(int oneIndex,
			int anotherIndex, T[] array) 
		if (array == null) 
			throw new NullPointerException("null value input");
		
		checkIndexs(oneIndex, anotherIndex, array.length);
		T temp = array[oneIndex];
		array[oneIndex] = array[anotherIndex];
		array[anotherIndex] = temp;
	

	/**
	 * Swap tow elements of the array
	 * 
	 * @param oneIndex
	 *            one index
	 * @param anotherIndex
	 *            another index
	 * @param array
	 *            the array to be swapped
	 * @exception NullPointerException
	 *                if the array is null
	 */
	public static void swap(int oneIndex, int anotherIndex, int[] array) 
		if (array == null) 
			throw new NullPointerException("null value input");
		
		checkIndexs(oneIndex, anotherIndex, array.length);
		int temp = array[oneIndex];
		array[oneIndex] = array[anotherIndex];
		array[anotherIndex] = temp;
	

	/**
	 * Check the index whether it is in the arrange
	 * 
	 * @param oneIndex
	 *            one index
	 * @param anotherIndex
	 *            another index
	 * @param arrayLength
	 *            the length of the Array
	 * @exception IllegalArgumentException
	 *                if the index is out of the range
	 */
	private static void checkIndexs(int oneIndex, int anotherIndex,
			int arrayLength) 
		if (oneIndex < 0 || anotherIndex < 0 || oneIndex >= arrayLength
				|| anotherIndex >= arrayLength) 
			throw new IllegalArgumentException(
					"illegalArguments for tow indexs [" + oneIndex + ","
							+ oneIndex + "]");
		
	

冒泡排序算法BubbleSortord：

package com.meritit.sortord.bubble;

import com.meritit.sortord.util.Swapper;

/**
 * Bubble sort order, time complexity is O(n2)
 * 
 * @author ysjian
 * @version 1.0
 * @email [e-mail]
 * @QQ 646633781
 * @telephone [phone]
 * @csdnBlog http://blog.csdn.net/ysjian_pingcx
 * @createTime 2013-12-20
 * @copyRight Merit
 * @since 1.5
 */
public class BubbleSortord 

	private static final BubbleSortord INSTANCE = new BubbleSortord();

	private BubbleSortord() 
	

	/**
	 * Get the instance of ComparisonSortord, only just one instance
	 * 
	 * @return the only instance of BubbleSortord
	 */
	public static BubbleSortord getInstance() 
		return INSTANCE;
	

	/**
	 * Sort the array of <code>int</code> with bubble sort order
	 * 
	 * @param array
	 *            the array of int
	 */
	public void doSort(int... array) 
		int length = array.length;

		// a flag judge whether the array is in order
		boolean flag = true;
		for (int i = 0; i < length - 1 && flag; i++) 
			flag = false;// set false
			for (int j = 0; j < length - i - 1; j++) 
				if (array[j] > array[j + 1]) 

					// compare two neighbor elements
					Swapper.swap(j, j + 1, array);
					/*
					 * if the line is not reach, indicate that the array is in
					 * order, then break the circulation
					 */
					flag = true;
				
			
		
	

	/**
	 * Sort the array of generic <code>T</code> with bubble sort order
	 * 
	 * @param array
	 *            the array of generic <code>T</code>
	 */
	public <T extends Comparable<T>> void doSortT(T[] array) 
		int length = array.length;
		boolean flag = true;
		for (int i = 0; i < length - 1 && flag; i++) 
			flag = false;
			for (int j = 0; j < length - i - 1; j++) 
				if (array[j].compareTo(array[j + 1]) > 0) 
					Swapper.swap(j, j + 1, array);
					flag = true;
				
			
		
	

测试TestBubbleSortord：

package com.meritit.sortord.bubble;

import java.util.Arrays;

public class TestBubbleSortord 
	/**
	 * Test
	 * 
	 * @param args
	 */
	public static void main(String[] args) 
		BubbleSortord bubbleSort = BubbleSortord.getInstance();
		int[] array =  25, 36, 21, 45, 98, 13 ;
		System.out.println(Arrays.toString(array));
		bubbleSort.doSort(array);
		System.out.println(Arrays.toString(array));
		System.out.println("------------------------");
		Integer[] arrays =  25, 35, 11, 45, 98, 65 ;
		System.out.println(Arrays.toString(arrays));
		bubbleSort.doSortT(arrays);
		System.out.println(Arrays.toString(arrays));
	

冒泡排序算法详解： http://blog.csdn.net/ysjian_pingcx/article/details/8653732 冒泡排序算法源码免积分下载： http://download.csdn.net/detail/ysjian_pingcx/6755209