秩序配列の集計

import java.util.Arrays;

public class Sort {

	public static void main(String[] args) {

		//  
		int[] array1 = { 3, 6, 12, 22, 33, 34, 65, 88 };
		int[] array2 = { 1, 2, 3, 4, 6, 7, 8, 9, 10 };

		//  
		int[] array3 = { 45, 44, 33, 8, 5, 3, 2, 1 };
		int[] array4 = { 76, 45, 34, 23, 10, 3, 1 };

		//  ， 
		System.out.println(Arrays.toString(sort(array1, array2)));

		//  ， 
		System.out.println(Arrays.toString(sort(array1, array3)));

		//  ， 
		System.out.println(Arrays.toString(sort(array4, array2)));

		//  ， 
		System.out.println(Arrays.toString(sort(array3, array4)));
	}

	private static int[] sort(int[] array1, int[] array2) {

		//  
		if (null == array1 || array1.length == 0) {
			return array2;
		}
		if (null == array2 || array2.length == 0) {
			return array1;
		}

		int len1 = array1.length;
		int len2 = array2.length;
		int[] result = new int[len1 + len2];

		// 0 ：  1 ： 
		int flag1 = array1[0] < array1[len1 - 1] ? 0 : 1;
		int flag2 = array2[0] < array2[len2 - 1] ? 0 : 1;

		//  
		if (flag1 == 0 && flag2 == 0) {
			int i = 0, j = 0, k = 0;
			while (i < len1 && j < len2) {
				if (array1[i] < array2[j]) {
					result[k++] = array1[i++];
				} else {
					result[k++] = array2[j++];
				}
			}
			while (i < len1) {
				result[k++] = array1[i++];
			}
			while (j < len2) {
				result[k++] = array2[j++];
			}

		// array1  array2 
		} else if (flag1 == 0 && flag2 == 1) {
			int i = 0, j = len2 - 1, k = 0;
			while (i < len1 && j >= 0) {
				if (array1[i] < array2[j]) {
					result[k++] = array1[i++];
				} else {
					result[k++] = array2[j--];
				}
			}
			while (i < len1) {
				result[k++] = array1[i++];
			}
			while (j >= 0) {
				result[k++] = array2[j--];
			}

		// array1  array2 
		} else if (flag1 == 1 && flag2 == 0) {
			int i = len1 - 1, j = 0, k = len1 + len2 - 1;
			while (i >= 0 && j < len2) {
				if (array1[i] < array2[j]) {
					result[k--] = array1[i--];
				} else {
					result[k--] = array2[j++];
				}
			}
			while (i >= 0) {
				result[k--] = array1[i--];
			}
			while (j < len2) {
				result[k--] = array2[j++];
			}

		//  
		} else if (flag1 == 1 && flag2 == 1) {
			int i = len1 - 1, j = len2 - 1, k = len1 + len2 - 1;
			while (i >= 0 && j >= 0) {
				if (array1[i] < array2[j]) {
					result[k--] = array1[i--];
				} else {
					result[k--] = array2[j--];
				}
			}
			while (i >= 0) {
				result[k--] = array1[i--];
			}
			while (j >= 0) {
				result[k--] = array2[j--];
			}
		}

		return result;
	}
}