java折半插入排序

Posted 2020-10-03 不忘初心

代码如下：

public class BinaryInsertSort {
	public static void binaryInsertSort(DataWrap [] data)
	{
		System.out.println("开始排序:");
		int length = data.length;
		for(int i = 1;i < length;i++)
		{
			//当整体后移时，保证data[i]的值不会丢失
			DataWrap tmp = data[i];
			int low = 0;
			int high = i-1;
			while(low <= high)
			{
				//找出low，high中间的索引
				int mid = (low+high)/2;
				//如果tmp值大于low、high中间元素的值
				if(tmp.compareTo(data[mid]) >0)
				{
					//限制在索引大于mid的那一半中搜索
					low = mid +1;
				}
				else
				{
					//限制在索引小于mid的那一半中搜索
					high = mid -1;
				}
			}
			//将low到i处的所有元素向后整体移一步
			for(int j = i; j > low ;j-- )
			{
				data[j] =data[j-1];
			}
			//最后将tmp的值插入合适位置
			data[low] = tmp;
			System.out.println(java.util.Arrays.toString(data));
		}
	}
	public static void main(String[] args) {
		DataWrap[] data = {
				new DataWrap(21, ""),
				new DataWrap(30, ""),
				new DataWrap(49, ""),
				new DataWrap(30, ""),
				new DataWrap(16, ""),
				new DataWrap(9, ""),
				new DataWrap(-16, "")
		};
		System.out.println("排序之前:\n" + java.util.Arrays.toString(data));
		binaryInsertSort(data);
		System.out.println("排序之后:\n" + java.util.Arrays.toString(data));
	}
}