100 Days of Java challenges

[
  [23, 45, 78, 12],
  [56, 90, 34, 67],
  [89, 21, 43, 76]
]

Write a program that performs the following tasks:

• Initialise a 3x4 2D-Array with the above values
• Write a function that takes a 2D array as the parameter and returns an array with the maximum value of each row. For the above example, the function should return the array [78, 90, 89]
• Write a function that takes a 2D array as the parameter and returns an array with the maximum value of each column. For above example, the function should return the array [89, 90, 78, 76]
• Write a function that takes nxm 2D array as a parameter and returns a mxn transformation of the input 2D array