How to take input matrix value from user and transpose it

import java.util.*;

public class InputMatrixFromUserAndTranspose {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int m=sc.nextInt();
int n=sc.nextInt();
int a[][]=new int[m][n];
for (int i=0; i<m; i++) {
for (int j=0; j<n; j++) {
a[i][j]=sc.nextInt();
}
}
int b[][]=new int[m][n];
for (int i=0; i<m; i++) {
for (int j=0; j<n; j++) {
b[i][j]= a[j][i];
System.out.print(b[i][j]+" ");
}
System.out.println();
}

}

}