Exercise3- Combination Lock

/*Programmer: Miexie D. Tulid
 *Date started: March 13, 2009
 *Date ended: March 18, 2009
 *Description: A program that used number buttons from 0-9, and once the user clicked three correct
 *unlocked combination, the program will exit, otherwise its background will turn to red.*/
import java.awt.*;
import javax.swing.*;

public class CombinationLock extends JFrame {

public static void main (String [] args) {
  new CombinationLock().setVisible(true);
  }

public CombinationLock () {

  Container cp = getContentPane();
  cp.setLayout(new FlowLayout());

   
  cp.add(new JButton("0"));
  cp.add(new JButton("1"));
  cp.add(new JButton("2"));
  cp.add(new JButton("3"));
  cp.add(new JButton("4"));
  cp.add(new JButton("5"));
  cp.add(new JButton("6"));
  cp.add(new JButton("7"));
  cp.add(new JButton("8"));
  cp.add(new JButton("9"));
  cp.setBackground(Color.white);
  pack();
   

  }
}

Exercise2- Color Cycle

/*Programmer: Miexie D. Tulid
 *Date started: March 13, 2009
 *Date ended: March 18, 2009
 *Description: A program that used button and once it clicked, the background

  changed with corresponds to its button name.*/

/*Programmer: Miexie D. Tulid
 *Date started: March 13, 2009
 *Date ended: March 18, 2009
 *Description: A program that used button and once it clicked, the background
  changed with corresponds to its button name.*/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;


public class ColorCycle extends JFrame 
    implements ActionListener {

  private WindowTerminator wt = new WindowTerminator(); // Code below
  private JButton red,blue, green, gray; // the JButtons which will cause the background colors to change
  private Container cp; // our contentpane

  public ColorCycle( ) {
  setSize(300,300);
  setLocation(100,100);
  setTitle(getClass().getName());


  addWindowListener(wt);

  red = new JButton("Red");
  green = new JButton("Green");
  blue = new JButton("Blue");
  gray = new JButton("Gray");
  red.addActionListener(this);
  green.addActionListener(this);
  blue.addActionListener(this);
  gray.addActionListener(this);
   
  cp = getContentPane();
  cp.setBackground(Color.white);
  cp.setLayout(new FlowLayout());
  cp.add(red);
  cp.add(green);
  cp.add(blue);
  cp.add(gray);

  show();
  }


  public void actionPerformed(ActionEvent e) {

  JButton s = (JButton) e.getSource(); //get the source of the event

  if ( s == red) cp.setBackground(Color.red);
  else if ( s == green) cp.setBackground ( Color.green);
  else if ( s == blue) cp.setBackground ( Color.blue);
else if ( s == gray) cp.setBackground ( Color.gray);


  cp.repaint();
  }


  public static void main (String[] args) {

  JFrame f = new ColorCycle();
  }

}

class WindowTerminator extends WindowAdapter {

  public void windowClosing (WindowEvent e) {
  System.exit(0);
  }
}

Exercise5- Hello

/*Programmer: Miexie D. Tulid
 *Date started: March 13, 2009
 *Date ended: March 18, 2009
 *Description: A program that reads a greeting from the user then prints it out. */
import java.util.Scanner;
public class HelloTester{
public static void main(String args[]){
String greet;
Scanner scan=new Scanner(System.in);
System.out.println("Enter Greeting:");
greet=scan.nextLine();
Hello h=new Hello(greet);
System.out.println(h.echo());
}
}

Exercise4- Name Echo

/*Programmer: Miexie D. Tulid
 *Date started: March 13, 2009
 *Date ended: March 18, 2009
 *Description: A program that reads a full name the user and prints it out w/ the same word in firstname

 but upper case in last name.*/

 import java.util.Scanner;
public class NameEcho{
public static void main(String args[]){

Scanner scan=new Scanner(System.in);
String name;
String fname;
String lname;

System.out.println("Enter your name:");
name=scan.nextLine();
int x=name.indexOf(" ");
fname=name.substring(0,x);
lname=name.substring(x);
System.out.printf("\n%s %s\n",fname,lname.toUpperCase());

}
}

Exercise1- Word Reverser

/*Programmer: Miexie D. Tulid
 *Date started: March 13, 2009
 *Date ended: March 18, 2009
 *Description: A program that reads a sentence from the user and prints it out w/ each word
 *reversed.*/

import java.util.*;
public class reverseSent{
public static void main(String args[]){

String input;
String r;
 Scanner scan=new Scanner(System.in);
 System.out.println("Input:");
 input=scan.nextLine();
 StringTokenizer st=new StringTokenizer(input) ;
  while (st.hasMoreTokens()) {
  r=st.nextToken();
  r=new StringBuffer(r).reverse().toString();
  System.out.print(r+" ");
   
  }
   
}
}

Friendly Division by: Miexie D. Tulid

/*Programmer:Miexie D. Tulid
Excersice no. 1
Date started: March 06, 2009
Date ended: March 07, 2009
Description: A program that will ask numerator and denominator, generate the quotient. Then
if the user enters 'q' or 'Q' the program will quit.*/

/*Programmer:Miexie D. Tulid
Excersice no. 1
Date started: March 06, 2009
Date ended: March 07, 2009
Description: A program that will ask numerator and denominator, generate the quotient. Then
if the user enters 'q' or 'Q' the program will quit.*/

import java.util.InputMismatchException;
import java.util.Scanner;

public class DivisionPractice{

public static float quotient(float numerator, float denominator)throws ArithmeticException
{
return numerator/denominator;}

public static void main(String args[]){
Scanner scan=new Scanner(System.in);

String exitchar="mix";
char x=exitchar.charAt(0);
float numerator=0;
float denominator=0;
String ask="mix";



while(x!='q'){
if(x != 'Q'){

try{
System.out.println("Enter the numerator:");
if((scan.next().charAt(0)=='q')||(scan.next().charAt(0)=='Q')){
x=scan.next().charAt(0);
}else{
numerator=scan.nextFloat();
System.out.println("Enter the divisor:");
denominator=scan.nextFloat();
float result=quotient(numerator,denominator);
System.out.println(numerator+"/"+denominator+" is "+result);
}
}

catch(ArithmeticException arerr)
{
System.err.println("You can't divide "+numerator+" by "+denominator);
}

catch(InputMismatchException inputerr)
{
System.err.println("You enter bad data.\nPlease try again.");
}
catch(IndexOutOfBoundsException index)
{
System.err.println("");
}

}else{
x='q';
}
}

}
}

/*Programmer: Miexie D. Tulid *Date started: March 02, 2009
 *Date ended: March 02, 2009
 *Description: A program that uses ArrayList and Iterator classes.*/

import java.util.Iterator;
import java.util.ArrayList;
import java.util.Scanner;
import javax.swing.*;

public class ArrayListIteratorTest{
public static void main(String args[]){
Scanner scan=new Scanner(System.in);
String x="s";


ArrayList list=new ArrayList();



while(!x.equals("q")){
    x=JOptionPane.showInputDialog("Enter your favorite phrase. (Enter q to quit..)");
list.add(x);
}

System.out.println("Array List contents : ");
Iterator it = list.iterator();
while (it.hasNext()) {
String element = it.next();
if(!element.equals("q")){

 System.out.println(element);}
}  


}
}

Date: March 02, 2009

Things I've learned in this exercise.

• ArrayList cannot hold premitive data types such as int.
• In declaring an ArrayList index may not be specify.
• Iterator class is the class that is used to manipulate ArrayList.