//import java.util.Random;
import java.util.*;

public class Doodle {

    public static void useArrayList() {
        // yucky code
//         ArrayList list = new ArrayList();
//         list.add( "3" );
//         list.add( new Integer(4) );
//         System.out.println( "There are " + list.size() + " elements" );
        ArrayList<Object> list = new ArrayList<Object>();
        list.add(3);
        list.add("3");
        

        // yummy code
        ArrayList<Integer> int_list = new ArrayList<Integer>();
        int_list.add( 4 );
        int i = int_list.get(0);
        System.out.println( "There are " + int_list.size() + " elements" );
    }

    public static void useRandom() {
        //java.util.Random generator = new java.util.Random();
        Random generator = new Random();
        System.out.println( generator.nextInt(11) );
    }

    public static void forLoops() {
        // for ( <init>; <condition>; <update> ) {
        //    <body>
        // }
//         for (int integer = 42; integer >= 0; integer -= 1) {
//             System.out.println( integer );
//         }
        // canonical way to do something 10 times
        for (int i = 0; i < 10; i++ ) {
            System.out.println( "doing something" + i );
            int b = ++i;
            System.out.println( "at end of loop" + i + " b = " + b );
        }
    }

    public static void whileLoops() {
        // while ( <condition> ) {
        //    <body>
        // }
        int integer = 42;
        while ( integer >= 0 ) {
            System.out.println( integer );
            integer -= 1;
        }
    }

    public static void main( String args[] ) {
        useArrayList();
    }
}