Having some trouble on this problem; code should be in java. Any help would be appreciated. Thanks!

Problem Problem: Write a method that will return a list of all #s that appear in the matrix. Numbers that repeat should only be listed once. List numbers as they are encountered in the matrix. Data: One matrix which may be empty but will not be null. Output: Return a list of all values that are unique. Sample Data [ 1, 2, 3, 0], [ 1, 0, 0, 1, 1] [ 1, 2, 3, 0], [ 0, 1, 0, 1, 1] [ 4, 15, 1], [ 73, 2] [ 7, 7, 7], [-12, 30], [0,0,0,0, 0] Sample Output [1, 2, 3, 0] [1, 2, 3, 0] [4, 15, 1, 73, 2] [7, -12, 30, 0]