| Shortcut | Description |
|---|---|
| Win key+C | Open the Charms |
| Win key+F | Open the Search charm to search files |
| Win key+H | Open the Share charm |
| Win key+I | Open the Settings charm |
| Win key+J | Switch the main app and snapped app |
| Win key+K | Open the Devices charm |
| Counter.java |
|---|
import java.util.concurrent.Semaphore;
import javax.swing.JTextArea;
public class Counter extends Thread{
private static int count=0;
private String ID;
private JTextArea TBox;
private Semaphore sem;
public ServiceQueue(String name,JTextArea jArea, Semaphore s){
ID=name;
TBox=jArea;
sem=s;
}
private void nonCrit(int i){
System.out.println(ID+" is not in critical: "+i);
}
private synchronized void doCrit(){
count++;
TBox.append(ID+" gave count: "+count+"\n");
}
public void run(){
for(int ctr=0;ctr<10;ctr++){
nonCrit(ctr);
try{
sem.acquire();
} catch (InterruptedException e){ }
doCrit();
sem.release();
}
}
}
|
| Executioner.java |
|---|
import javax.swing.*;
import java.util.concurrent.Semaphore;
import java.awt.*;
public class Executioner extends JFrame{
public Executioner(){
super("Hello World");
JTextArea TA=new JTextArea(20,15);
Semaphore sem = new Semaphore(3, true);
setLayout(new FlowLayout());
add(TA);
Counter Q1=new ServiceQueue("1st Class",TA,sem);
Counter Q2=new ServiceQueue("3rd Class",TA,sem);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
C1.start();
C2.start();
pack();
}
public static void main(String args[]){
new Executioner();
}
}
|
| Error Code | Meaning |
|---|---|
| 302 | Redirect |
| 400 | bad_request |
| 401 | unauthorized |
| 403 | forbidden |
| 404 | not_found |
| 405 | method_not_allowed |
| 500 | internal_server_error |
| 507 | insufficient_storage |
| Stage | Purpose | When it happens | Can be Overridden |
|---|---|---|---|
| init() | Initialize servlet before client request | After the servlet instance is created | Possibly, when you have an initialization code |
| service() | determine the HTTP method (Get/post) | When the client's request comes in | No, unlikely |
| doget() dopost | Initialize servlet before client request | Invoked by service() whether the method is post or get | Always. this where the programmer's work is suppose to be in |
| Encapsulation | Objects keep track of its state internally. Objects have characteristics that should not interact with other objects |
|---|---|
| Inheritance | Objects can get characteristics from other objects and interfaces. An objects characteristics can be passed down to other objects similar to the class |
| Polymorphisim | Object can have many forms to take for different situations |
| Abstraction | Putting classes in a general to most specific hierarchy. Some characteristics are hidden and do not need to be changed but it can still they can still be modified. Group objects base on what they can do |
