import java.awt.*;
import javax.swing.*;

public class TwoDArrayDemo {
    
   public static void main(String[] argv) {

	String input;
        int rows, cols, range;
        int sum=0;
	
	input = JOptionPane.showInputDialog("Enter # of rows");
	rows = Integer.parseInt(input);
	
	input = JOptionPane.showInputDialog("Enter # of columns");
	cols = Integer.parseInt(input);

	input = JOptionPane.showInputDialog("Enter range of data");
	range = Integer.parseInt(input);
  
	JTextArea textarea = new JTextArea(20,100); 
	//textarea.setLineWrap( true );
	textarea.setFont( new Font("Courier",Font.BOLD,18) );
	JScrollPane scrollpane = new JScrollPane(textarea);
		
	int [][] A2 = new int [rows][cols];  //*** 2D array of ints
	//first index is row, second is column

	int []freq = new int[range];  //frequency/count of each value

	for (int i=0; i<rows; i++) {   //***loop over each row (index)
	    for (int j=0; j<cols; j++) {   //***each column/element of that row
	        A2[i][j] = (int)(Math.random()*range);  //random int data 0 to range-1
	        textarea.append(" "+A2[i][j]);  //add to textarea
	        sum += A2[i][j];    //sum of all elements 
	        freq[A2[i][j]]++;   //increment count of this i,j value of the 2D arrray
	    }
	    textarea.append("\n");   //end of each row
	}
	
	textarea.append("\n#data="+rows*cols+"  sum="+sum+"   average="+
		        (double)sum/(rows*cols)+"\n");

	for (int i=0; i<range; i++)
	    textarea.append(" "+i+":"+freq[i]);
	        
	JOptionPane.showMessageDialog(null, 
				      scrollpane,
				      "Cool 2D array stuff",
				      JOptionPane.PLAIN_MESSAGE);
				      
    }
}