How to print a matrix with outer elements sorted and a blank in the place of inner elements in JAVA?

Question

Eg 9 8 2 2
0 9 -2 7
2 9 1 0
output-
0 0 1 2
9 2
9 8 7 2

Answer 1

The matrix will be mat[i][j].

First of all we sort the matrix, with simple for we get all the integers and place them.

To clean out the middle we need to check that:
1+1 < width && height
if so, we create a string matrix, to handle empty values in the middle.
String[][] newMat = new String[mat.length][]
for (int i=0; i <newMat.length; i++)
for (int j=0; j < newMat [i].length; i++)
newMat [i][j] = mat [i][j].toString();

//Clear middle
for (int i = 1; i <newMat.length - 1; i++)
for (int j = 1; j < newMat [i].length-1; i++)
newMat [i][j] = "";