Write a program that generates and save 100 random integers between 0 and 9 into a text file. Then read the data from the text file to calculate and display the count for each number (0 to 9). You need to apply all programming techniques such as selection, loop, array, method and file i/o in your program. Your program should have at least three methods:

1. A method to generate random numbers and save
2. A method to count each number.
3. A method to display the final count for each number.