java - How can I fix my program so that it can work with any number of rows and column user asks? -

import java.util.scanner;  public class hi {      public static void main(string[] args) {          // test         //int[][] testarray = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 } };          int[][] testarray = {         { randomnumber(), randomnumber(), randomnumber() },         { randomnumber(), randomnumber(), randomnumber() },         { randomnumber(), randomnumber(), randomnumber() } };         //         // display array         printarray(testarray);       } // end main      // display tables     private static void printarray(int[][] array) {          scanner sc = new scanner(system.in);         //ask user         system.out.println("how many rows: ");         int rows= sc.nextint();          system.out.println("how many columns: ");         int columns= sc.nextint();          (int row = 0; row < array.length; rows++) {             (int col = 0; col < array[rows].length; col++) {                 system.out.print(array[rows][columns] + " ");             }             system.out.println();         }     }        private static int randomnumber() {         int random = (int) (math.random() * 9);         return random;     }  } 

currently program working 3 rows , 3 columns. how can make work works rows , columns user inserts?. , methods work whatever user insert?

to use user inputted size, can same thing you're doing in printarray() , use sizes create array:

public static void main(string[] args) {     scanner sc = new scanner(system.in);      // ask array size user     system.out.println("how many rows: ");     int rows= sc.nextint();     system.out.println("how many columns: ");     int columns= sc.nextint();      // fill array random numbers     int[][] testarray = new int[rows][columns];     (int i=0; i<testarray.length; ++i) {         (int j=0; j<testarray[i].length; ++j) {             testarray[i][j] = randomnumber();         }     }      // display array     printarray(testarray); } // end main 

also, you're using array length instead of current element when walking it:

this looks incorrect

    (int row = 0; row < array.length; rows++) {         (int col = 0; col < array[rows].length; col++) {             system.out.print(array[rows][columns] + " ");         }         system.out.println();     } 

fix (note how rows , columns replaced in outer for , in print()):

    (int row = 0; row < columns; row++) {         (int col = 0; col < rows; col++) {             system.out.print(array[row][col] + " ");         }         system.out.println();     }