在二维数组中查找重复值

The assignment I am working on requires that I create a Sudoku game without using any classes, methods, encapsulation, etc. I am new to Java so bare with me. I am having trouble validating that the values my user inputs into either my "fourArray" or "nineArray" contains no duplicate values. So far I have been trying to use a nested for-loop in order to iterate through both the columns and rows of either array. For example, I have been trying to include the following piece of code at the end of my program to determine if there are any duplicate values: The assignment I am working on requires that I