7. (3 points) The number of four-digit numbers that satisfy the following two conditions is $\qquad$.
(1) The sum of any two adjacent digits is no more than 2;
(2) The sum of any three adjacent digits is no less than 3.
【Analysis】From (1), we know that each digit of this four-digit number can only be $0,1,2$, and 1 and 2, 2 and 2 cannot be adjacent. Combining this with (2), we know that each digit cannot be 0. In summary, each digit can only be 1, which means this four-digit number is 1111.

【Solution】From the analysis, we know that the four-digit number that meets the conditions is 1111, and there is only 1 such number. Therefore, the answer is: 1.