Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| District | Incumbent | Party | First elected | Result | Candidates |
| --- | --- | --- | --- | --- | --- |
| Massachusetts 2 | Henry L. Bowles | Republican | 1925.0 | Re-elected | Henry L. Bowles (R) 64.0% John Hall (D) 36.0% |
| Massachusetts 3 | Frank H. Foss | Republican | 1924.0 | Re-elected | Frank H. Foss (R) 62.8% Joseph E. Casey (D) 37.2% |
| Massachusetts 6 | Abram Andrew | Republican | 1921.0 | Re-elected | Abram Andrew (R) 76.9% James McPherson (D) 23.1% |
| Massachusetts 10 | John J. Douglass | Democratic | 1924.0 | Re-elected | John J. Douglass (D) Unopposed |
| Massachusetts 11 | George H. Tinkham | Republican | 1914.0 | Re-elected | George H. Tinkham (R) Unopposed |
| Massachusetts 12 | James A. Gallivan | Democratic | 1914.0 | Re-elected | James A. Gallivan (D) Unopposed |
Question:
How many districts does john j. douglass represent?
Answer:
1.0