两个有序list合并

package 剑指office;

import java.util.ArrayList;
import java.util.List;

public class ListMerge {
    /**
     * 两个已顺序排序数组的合并
     *
     * @param aList
     * @param bList
     * @return
     */
    public static List<Integer> mergeTwoSortList(List<Integer> aList, List<Integer> bList) {
        int aLength = aList.size(), bLength = bList.size();
        List<Integer> mergeList = new ArrayList<Integer>();
        int i = 0, j = 0;
        while (aLength > i && bLength > j) {
            if (aList.get(i) > bList.get(j)) {
                mergeList.add(i + j, bList.get(j));
                j++;
            } else {
                mergeList.add(i + j, aList.get(i));
                i++;
            }
        }
        // blist元素已排好序， alist还有剩余元素
        while (aLength > i) {
            mergeList.add(i + j, aList.get(i));
            i++;
        }
        // alist元素已排好序， blist还有剩余元素
        while (bLength > j) {
            mergeList.add(i + j, bList.get(j));
            j++;
        }
        return mergeList;

    }

    public static void main(String[] args) {
        List<Integer> aList = new ArrayList<Integer>();
        ;
        aList.add(3);
        aList.add(6);
        aList.add(7);
        aList.add(10);
        aList.add(13);
        List<Integer> bList = new ArrayList<Integer>();
        bList.add(1);
        bList.add(2);
        bList.add(5);
        bList.add(12);
        bList.add(15);
        bList.add(20);
        bList.add(21);
        List<Integer> mergeList = mergeTwoSortList(aList, bList);

        System.err.println(mergeList.toString());
    }
}