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public class cis229wk3 {
	 static long gcd(long m, long n) {
		   if (n==0)
		     return m;
		   else
		     return gcd(n, m % n);
	} 

	public static void main(String [] args) {
		System.out.println(gcd(4,8));
		// program returns a 4
	}
}

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import java.util.ArrayList;
import java.lang.*;

public class reverse {
        public static void main (String []args) {
                        ArrayList a= new ArrayList();
                        a.add("entry 0");
                        a.add("entry 1");
                        a.add("entry 2");
                        a.add("entry 3");
                        a.add("entry 4");

                        System.out.println(a);
                        System.out.println(reverse(a));

                }

        public static ArrayList reverse( ArrayList list ) {
           ArrayList store= new ArrayList();
           for (int i = 0; i < list.size(); i++) {
                store.add(list.get(list.size() -1 - i));
           }
        return store;
        }
}

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import java.awt.*;
import java.awt.event.*;
import java.util.Random;
import javax.swing.*;

public class shuffle {

  public shuffle(){
    window.setSize(1100,550);
    window.setLayout(new FlowLayout());
    JLabel cards[] = new JLabel[52];
  int number = 0;
  int [] ranarray = new int[52];
  boolean used[] = new boolean[52] ;

  Random generator = new Random();

  for (int i = 0; i < 52; i++) {
    do { number = generator.nextInt(52); }
      while(!used[number] == false); //while number has been used before try again
        {
           ranarray[i] = number; //unique number? add it to the array
           used[number] = true; //set number to true for comparison
        }
     }

    for (int i = 0; i < 52; i++) {
    cards[ranarray[i]] = new JLabel(new ImageIcon("cards/" + ranarray[i] + ".png")); //display cards
    window.add(cards[ranarray[i]]); //add cards
     }

    //show the window
    window.setVisible(true);

    }

  private JFrame window = new JFrame("Shuffle");

  //open Shuffle
  public static void main(String[] args){
    new shuffle();

  }

}

Copy of code hosted at http://pastie.org/755948

Code saved as Shuffle.java

import java.awt.*;
import java.awt.event.*;
import java.util.Random;
import javax.swing.*;

public class TicTac implements ActionListener {

  public TicTac(){
    window.setSize(150,150);
    window.setLayout(new GridLayout(3,3));

    // display the buttons, smaller code with loop
    for(int i=0; i<=8; i++){
      buttons[i] = new JButton();
      window.add(buttons[i]);
      buttons[i].addActionListener(this);
    }

    //show the window
    window.setVisible(true);
    }

  private JFrame window = new JFrame("Noughts & Crossess");
  private int count = -1;
  private int[][] winner = new int[][] {
      {0, 1, 2}, {3, 4, 5}, {6, 7, 8},
      {0, 3, 6}, {1, 4, 7}, {2, 5, 8},
      {0, 4, 8}, {2, 4, 6}
    };
  private JButton buttons[] = new JButton[9];
  private String player = "";
  private boolean clicked[] = new boolean[10] ;
  private boolean won = false;

  public void actionPerformed(ActionEvent game) {

    for( int i = 0; i < clicked.length; i++ )
            clicked[i] = false ;

    count++;

    // PC or Human's go
    if(count % 2 == 0){
       player = "O";
       JButton pressedButton = (JButton)game.getSource();
       pressedButton.setText(player);
       pressedButton.setEnabled(false);

    } else {

      Random generator = new Random();
      player = "X";  

       int cpuclick;

      	do {
          cpuclick = generator.nextInt(9); }
    	  while(!buttons[cpuclick].isEnabled());
      	//isEnabled http://java.sun.com/j2se/1.4.2/docs/api/java/awt/Component.html#isEnabled()
      	//this line checks if the button has already been clicked by the computer or human player
      	 {
    	   buttons[cpuclick].setText(player);
           buttons[cpuclick].setEnabled(false);
         }
    	}

     // Is there a winner?
    for(int i=0; i<=7; i++){
      if( buttons[winner[i][0]].getText().equals(buttons[winner[i][1]].getText()) &&
        buttons[winner[i][1]].getText().equals(buttons[winner[i][2]].getText()) &&
        buttons[winner[i][0]].getText() != ""){
        won = true;
      }
    }
    // if there is a winner display who one and close
    if(won == true){
      JOptionPane.showMessageDialog(null, player + " wins the game!");
      System.exit(0);
    } else if(count == 9 && won == false){
      JOptionPane.showMessageDialog(null, "The game was tie!");
      System.exit(0);
    }
  }

  //open TicTac
  public static void main(String[] args){
    new TicTac();
  }

}

Copy of code hosted at http://pastie.org/688030

Code saved as TicTac.java

import java.util.Calendar;
import java.io.*;
import javax.swing.JOptionPane;

public class Age{
    public static void main(String args[])
    {
        String year = JOptionPane.showInputDialog
        ("Please Enter Your Year of Birth:");
        String month = JOptionPane.showInputDialog
        ("Please Enter The Month You Where Born:");
        String day = JOptionPane.showInputDialog
        ("Please Enter The Day You Where Born:");

        int y = Integer.parseInt(year);
        int m = Integer.parseInt(month);
        int d = Integer.parseInt(day);

        Calendar rightNow = Calendar.getInstance();
    	int yearnow = rightNow.get(rightNow.YEAR);
    	int monthnow = rightNow.get(rightNow.MONTH);
    	int daynow = rightNow.get(rightNow.DAY_OF_MONTH);
    	monthnow++;
    	yearnow -= y;
    		if (m>monthnow || m == monthnow && d>daynow)
    		{
    			yearnow--;
    		}
        JOptionPane.showMessageDialog
        (null, yearnow);
    }
}

Copy of code hosted at http://pastie.org/684706
Code saved as Age.java