面接の並べ替え問題

public class test {

	public static int[] b = { 1, 3, 5, 7, 9, 10, 11, 90 };
	public static int[] a = { 2, 5, 7, 8, 9 };
	public static void main(String[] args) {
		test1(a,b);

		Map<Integer,Integer> map=sortByTreeMap(a,b);
		Iterator iterator =  map.entrySet().iterator();
		while (iterator.hasNext()) {
           Map.Entry mapentry = (Map.Entry)iterator.next();
           System.out.print(mapentry.getValue()+" ");
		}

	}
	public static void test1(int[] a, int[] b){
		int[] c = new int[a.length + b.length];

		int i = 0, j = 0, k = 0;

		while (i < a.length && j < b.length) {
			if (a[i] <= b[j]) {
				if (a[i] == b[j]) {
					j++;
				} else {
					c[k] = a[i];
					i++;
					k++;
				}
			} else {
				c[k] = b[j];
				j++;
				k++;
			}
		}
		while (i < a.length) {
			c[k] = a[i];
			k++;
			i++;
		}
		while (j < b.length) {
			c[k] = b[j];
			j++;
			k++;
		}
		System.out.println(Arrays.toString(c));
	}
	public static Map sortByTreeMap(int[] a, int[] b){
		 Map<Integer,Integer> map=new TreeMap<Integer,Integer>();
	        for(int i=0;i<a.length;i++){
	            map.put(a[i], a[i]);
	        }
	        for(int i=0;i<b.length;i++){
	            map.put(b[i], b[i]);
	        }
	        return map;
	}

}