homework 1 for cs221

hw1.java

// Name: Sahat Yalkabov
// Date: September 15, 2011
// Class: CS22100
// Homework 1: Radiation Data Log

import java.util.ArrayList;
import java.util.Collections; // to get minimum and maximum
import javax.swing.JOptionPane;;

class hw1 {
	public static void main(String[] args) {
		
		ArrayList<Double> data = new ArrayList<Double>();
		String value = ""; // temporary string before it's added to ArrayList
		String historical = ""; // value that's compared against with average data
		double min = 0;
		double max = 0;
		double mean = 0;
		double total = 0;
        
        try {
        	historical = JOptionPane.showInputDialog("Enter historical background measurement: ");

        	while (historical.equals("")) {
            	historical = JOptionPane.showInputDialog("---THE INPUT CANNOT BE BLANK---\n" +
            			"Enter historical background measurement: ");
        	}
        	
        	// runs until encounters if-statement that checks if 'q' is entered.
        	// didn't use while(!value.equals("q")) to break from the loop because
        	// it didn't get out of the loop right away, thus proceeding to the
        	// data.add(Double.parseDouble(value)); which tries to parse "q" into double
        	// causing exception error.
        	while (true) {
        		value = JOptionPane.showInputDialog("Enter more background measurements: ");

            	while (value.equals("")) {
                	value = JOptionPane.showInputDialog("---THE INPUT CANNOT BE BLANK---\n" +
                			"Enter historical background measurement: ");
            	}
            	
            	if (value.equals("q")) {
            		break;
            	}
            	
            	data.add(Double.parseDouble(value));
        	}
        	
        	// if-statement to prevent exceptions caused by the user not inputing any values at all,
        	// typing "q" to exit the loop.
	        if (data.size() > 0) {
	        	for (int i=0; i<data.size(); i++) {
	        		total += data.get(i);
	        	}
	        	mean = total / data.size();
	        	min = Collections.min(data);
	        	max = Collections.max(data);
	        }
	        
	        JOptionPane.showMessageDialog(null, "Minimum: " + min +
	        		"\nMaximum: " + max + "\nMean: " + mean);
	        
        	if (mean > (Double.parseDouble(historical)*0.1 + Double.parseDouble(historical)))
        		JOptionPane.showMessageDialog(null, "Warning: Radiation levels are unusually high!",
        			"WARNING", JOptionPane.WARNING_MESSAGE);	
        }
        
        // If at any point user clicks Cancel or presses ESC, exception will be caught
        // with a message dialogue and then terminating.
        catch (NullPointerException n) {
        	JOptionPane.showMessageDialog(null, "Goodbye!");
        }

       
	}
}