Creating Sudoku game in java [on hold]

I am making a sudoku game in java . I have just studied loops, if else and arrays in detail and have to use a logic from these topics . Basically i have to make 9*9 matrix or array in which we have to generate numbers and also I have to make a checker to check whether solution is right or wrong. Numbers filled in rows and columns should be unique and also every number in 3*3 matrix in 9*9 matrix should also be unique. Game should be made without recursion or use of any methods as i hasn't studied both.