import java.util.Arrays;

public class Test {

    public static void main(String[] args) {
        int[] a = {1,2,3,4,5,6,7,8,9};
        int next1 = nextContinuous(a);
        System.out.println(next1);
        int[] b = {1,2,3,5,6,7,8,9};
        int next2 = nextContinuous(b);
        System.out.println(next2);        
    }
    
    private static int nextContinuous(int[] nums) {
        Arrays.sort(nums);
        int k = nums[0];
        for(int i = 0; i < nums.length; i++, k++) {
            if(nums[i] != k) {
                return k;
            }
        }
        return k;
    }
}

------解决方案--------------------
HTML code
import java.util.Arrays;

class Discontinuity {

    public static void getDiscontinuity(int[] array) {
        Arrays.sort(array);
        int i = 0, temp = array[0];
        for (; i < array.length; i++, temp++) {
            if (array[i] != temp) {
                break;
            }
        }
        System.out.println(temp);
    }

    public static void main(String[] args) {
        int[] array1 = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
        int[] array2 = { 1, 2, 3, 5, 6, 7, 8, 9 };
        getDiscontinuity(array1);
        getDiscontinuity(array2);
    }
}