java - Program that prompts the size of array then add all numbers not at the edge -

how can make program prompts size of array , fill random numbers, , add numbers not @ edge?

heres code:

import javax.swing.*;  public class array {      int matriznn[][];     public void setmatriznn(int n){          matriznn = new int[n][n];          (int = 0; < matriznn.length; i++) {                 (int j = 0; j < matriznn[i].length; j++) {                     matriznn[i][j]= (int)(math.random()*10);                     system.out.print(" "+matriznn[i][j]);         }          system.out.println(" ");     }  } 

import javax.swing.*; public class array {  int matriznn[][]; public void setmatriznn(int n){      matriznn = new int[n][n];      (int = 0; < matriznn.length; i++) {             (int j = 0; j < matriznn[i].length; j++) {                 matriznn[i][j]= (int)(math.random()*10);                 system.out.print(" "+matriznn[i][j]);     }      system.out.println(" "); system.out.println("size "+matriznn.length);  } 

}