Java

import java.applet.Applet;
import java.awt.Button;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JLabel;
import javax.swing.JTextField;

public class Greeting extends Applet implements ActionListener {

    JLabel labelName = new JLabel("Please enter your name.");
    JTextField textField = new JTextField(20);
    Button button = new Button("GREET");
    JLabel labelResult = new JLabel("Result goes here.");

    String userResult = "";

    public void init() {
        setSize(500, 500);
        setBackground(Color.yellow);
        add(labelName);
        add(textField);
        add(button);
        add(labelResult);

        button.addActionListener(this);
    }

    public String getText() {
        return userResult;
    }

    public void setName(String result){
        userResult = result;
    }

    public void actionPerformed(ActionEvent event) {
        if (event.getSource() == button) {
            labelResult.setText("Hello, " + userResult);
        }

    }
}

import java.util.Scanner;

public class StudentInfoTest 
{
    public static void main(String[] args) 
    {
        //Initiate scanner.
        Scanner input = new Scanner(System.in);

        //Declare Variables.
        String answer = "";
        double GPA = 0.0;

        //Create Object<br />
        StudentInfo info = new StudentInfo(null, 0, 0);

        //Prompt for and store student name.
        System.out.print("Enter student name: ");
        String name = input.nextLine();
        info.setName(name); 

        //Prompt for class credits and letter grade.
        //Loop until answer is "N".
        do 
        {
        System.out.print("Enter class credits: ");
        String credits = input.nextLine();

        System.out.print("Enter letter grade: ");
        String grade = input.nextLine();

        System.out.print("Add another class? (Y or N): ");

        answer = input.nextLine();
        }
        while (answer.equals("Y"));

        System.out.printf(name + ", Your GPA is %.2f/n.", GPA);

    }//Ends Main
}//Ends Class

public class StudentInfo {

        //Variables
        private String studentName;
        private double totalPoints;
        private double totalCredits;

        //Constructor
        public StudentInfo(String name, double points, double credits)
        {
            //Initialize Variables
            studentName = name;
            totalPoints = points;
            totalCredits = credits;
        }

        //Create "Set" Functions
        public void setName(String name)
        {
            studentName = name;
        }

        //Create "Get" Functions
        public String getName()
        {
            return studentName;
        }

            public void addClass(double credits, String grade)
            {
                double points = 0.0;

                if(grade == "A" | grade == "a")
                    points = 4.0;
                if(grade == "B" | grade == "b")
                    points = 3.0;
                if(grade == "C" | grade == "c")
                    points = 2.0;
                if(grade == "D" | grade == "d")
                    points = 1.0;
                if(grade == "F" | grade == "f")
                    points = 0.0;

                totalCredits += credits;
                totalPoints += (points * credits);

            }

            public double getGPA(double totalPoints, double totalCredits)
            {
                double GPA = 0.0;
                GPA = totalPoints / totalCredits;
                return GPA;
            }

            public static void displayStudent(String name, double GPA)
            {
            }
}//Ends Class

public class SalesTracking
{
    public static void main(String[] args)
    {
        //This introduces the scanner to simplify receiving user input.
        Scanner input = new Scanner(System.in);

<pre>
    //These statements declare the variables.
            double totalSales = 0;
            double averageSales = 0;
            double highestMonth = 0;
            double lowestMonth = 0;
            double highestSales = 0;
            double lowestSales = 0;

            total = computeTotalSales(monthlySales);
            average = computeAverageSales(monthlySales);
            highest = computeHighestMonth(monthlySales);
            lowest = computeLowestMonth(monthlySales);

    //This is the array that stores the months of the year.
    String[] monthArray = {"JANUARY", "FEBRUARY", "MARCH", "APRIL", "MAY", "JUNE", "JULY", 
                           "AUGUST", "SEPTEMBER", "OCTOBER", "NOVEMBER", "DECEMBER"};
    for (String month : monthArray); 
    {
        System.out.println(Arrays.toString(monthArray));
    }

    //This is the array that prompts for, stores, and displays the monthly sales.
    double[] monthlySales = new double[12];
    for (int index = 0; index < monthlySales.length; index++)
    {
        System.out.print("Enter the monthly sales: ");
        monthlySales[index] = Double.parseDouble(input.nextLine());
    }
        System.out.println("The monthly sales are: ");
        for (int index = 0; index < monthlySales.length; index++)
        { 
            System.out.println(monthlySales[index]);
        }
}//This bracket ends the main.

//This method receives the monthArray and monthlySales array and prompts the user for 
//each month's sales.
public static void getSales (String monthArray, double monthlySales)
{   
}

<!DOCTYPE html>
&lt;head>
&lt;title>Web Cam Access&lt;/title>
&lt;script src="http://code.jquery.com/jquery-1.7.2.min.js">&lt;/script>
&lt;script type="text/JavaScript" src="jquery. webcam.min.js">&lt;/script>
&lt;/head>
&lt;body>
<video autoplay></video>
&lt;form>&lt;input type='button' id='capture' value="Capture Image!"/>&lt;/form>
<div id="webcam"></div>
<p><a href="javascript:webcam.capture();void(0);">
</a></p>
&lt;script type="text/javascript">
jQuery("#webcam").webcam({
width: 320,
height: 240,
mode: "callback",
swffile: "jscam.swf",
});
&lt;/script>
<canvas id='canvas' width='150' height='170'></canvas>
&lt;script language='javascript'>
document.getElementById('capture').onclick = function () {
var video = document.querySelector('video');
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
ctx.drawImage(video, 0, 0, 300, 250);
var data = ctx.getImageData(0, 0, canvas.width, canvas.height);
// for (n = 0; n < data.width * data.height; n++) {
// var index = n * 4;
// data.data[index + 0] = 255 - data.data[index + 0];
// data.data[index + 1] = 255 - data.data[index + 1];
// data.data[index +`` 2] = 255 - data.data[index + 2];
// }
ctx.putImageData(data, 0, 0, canvas.width, canvas.height);
/*
* HttpRequest is used to send the image to the ImageServlet
* by the following codes...
*/
var imgData = canvas.toDataURL();
var xmlhttp = new XMLHttpRequest();
xmlhttp.open("POST", "/WebcamAccess/capture", true);
xmlhttp.send(imgData);
}
&lt;/script>
&lt;script src="webcam.js">&lt;/script>
&lt;/body>
&lt;/html></pre>

<pre lang="xml"><u>Web.xml Code:
</u>
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">
<description>Image Capture Tutorial</description>
<display-name>Tutorial</display-name>
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
<!-- Servlet -->
<servlet>
<servlet-name>ImageServlet</servlet-name>
<servlet-class>controller.ImageServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>ImageServlet</servlet-name>
<url-pattern>/capture</url-pattern>
</servlet-mapping>
</web-app>

package controller;
import java.io.File;
import java.io.FileOutputStream;
import java.io.Reader;
//import java.util.Random;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import sun.misc.BASE64Decoder;
public class ImageServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
    @Override
    public void doPost(HttpServletRequest request, HttpServletResponse response) {
        try {
            StringBuffer buffer = new StringBuffer();
            Reader reader = request.getReader();
            int current;
            while ((current = reader.read()) >= 0) {
                buffer.append((char) current);
            }
            String imgName;
            imgName = "abc";
            String data = new String(buffer);
            data = data.substring(data.indexOf(",") + 1);
            System.out.println("PNG image data on Base64: " + data);
            FileOutputStream output = new FileOutputStream(new File("/C:/WebcamAccess/"
            + imgName + ".png"));
            output.write(new BASE64Decoder().decodeBuffer(data));
            output.flush();
            output.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}