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/**  * Write a description of URLFINDER here.  *  * @author (your name)  * @version (a version number or a date)  */ import edu.duke.*; import java.io.*; public class URLFINDER {     public void asd(){         URLResource file = new URLResource("http://www.dukelearntoprogram.com/course2/data/manylinks.html");         for ( String item : file.words() ) {             String itemLower = item.toLowerCase();             int pos = itemLower.indexOf("youtube.com");             if ( pos != -1 ) {                 int beg = item.lastIndexOf("\"", pos);                 int end = ...

import edu.duke.*; import java.io.*; public class TagFinder{     public String findProtein(String dna){         int start = dna.indexOf("atg");         int stop = dna.indexOf("tag", start +3);         if (start == -1){             return "no starton protein found";         }                if ((stop-start)%3==0){             return dna.substring(start,stop+3);         }         else{             return"not not a protein because of Divisible factor";         }     }     public...

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import edu.duke.*; import java.io.File; public class GrayScaleConverter {     //started with the image i wanted(inImage)     public ImageResource makeGray(ImageResource inImage){     //I Made a blank image of the same size         ImageResource outImage = new ImageResource(inImage.getWidth(),inImage.getHeight());     //for each pixelin outImage         for(Pixel pixel : outImage.pixels()){     //look at the corresponding pixel in inImage             Pixel inPixel = inImage.getPixel(pixel.getX(),pixel.getY());     //compute inPixel's red + inPixel's blue + inpixel's green     //divide that sum by 3(call it average)     int average = (inPixel.getRed()+inPixel.getGreen()+inPixel.getBlue())/3;     //set pixel's red to average  ...

import edu.duke.*; import java.io.*; public class imageSaver {     public void doSave(){         DirectoryResource dr = new DirectoryResource();         for(File f : dr.selectedFiles()){             ImageResource image = new ImageResource(f);             String fname = image.getFileName();             String newfname = "copy-" + fname;             image.setFileName(newfname);             image.draw();             image.save();         }     }     }

import edu.duke.*; import java.io.File; public class GrayScaleConverter {     //started with the image i wanted(inImage)     public ImageResource makeGray(ImageResource inImage){     //I Made a blank image of the same size         ImageResource outImage = new ImageResource(inImage.getWidth(),inImage.getHeight());     //for each pixelin outImage         for(Pixel pixel : outImage.pixels()){     //look at the corresponding pixel in inImage             Pixel inPixel = inImage.getPixel(pixel.getX(),pixel.getY());     //compute inPixel's red + inPixel's blue + inpixel's green     //divide that sum by 3(call it average)     int average = (inPixel.getRed()+inPixel.getGreen()+inPixel.getBlue())/3;     //set pixel's red to average  ...

/**  * Write a description of GrayScaleConverter here.  *  * @author (your name)  * @version (a version number or a date)  */ import edu.duke.*; public class GrayScaleConverter {     //started with the image i wanted(inImage)     public ImageResource makeGray(ImageResource inImage){     //I Made a blank image of the same size         ImageResource outImage = new ImageResource(inImage.getWidth(),inImage.getHeight());     //for each pixelin outImage         for(Pixel pixel : outImage.pixels()){     //look at the corresponding pixel in inImage             Pixel inPixel = inImage.getPixel(pixel.getX(),pixel.getY());     //compute inPixel's red + inPixel's blue + inpixel's green     //divide that sum by 3(call it average)    ...

/**  * Write a description of greyscale here.  *  * @author (your name)  * @version (a version number or a date)  */ import edu.duke.*; import java.io.*; public class greyscale {     public void checkdir(){             DirectoryResource dr = new DirectoryResource();                 for (File f : dr.selectedFiles())         {                     System.out.println(f);         }     }         }

public class DaysAlivePrinter {     public static void main(String[] args)     {         // Sally Ride was born on May 26 1951         Day birthday = new Day (1951 , 5 , 26);                 // Her last day was July 23 2012         Day Lastday = new Day (2012 , 7 , 23);         // Use Day objects to calculate and print         int DaysAlive = Lastday.daysFrom(birthday);         // how many days she lived.         System.out.println(DaysAlive);         // You'll want to use the daysFrom method.         // Do you expect to get a negative or a positive number of days?   ...

// You can use this program to run experiments // 1. Add statements inside main // 2. Compile // 3. Right-click on the Test rectangle and select main // 4. Click Ok on the next dialog // 5. The output is displayed in a terminal window public class Test {     public static void main(String[] args)     {         // Add something inside the ( )         //compile time error         //System.out.println(a b);         //prints total and in only one line         //System.out.print(3+4+5);         //runtme Error         //System.out.println(1/0);         //prints total and goes to the next line         //System.out.println(3+4+5);     ...

https://www.coursera.org/learn/java-programming/supplement/6CLKD/module-learning-outcomes-resources Iterables in Java Module In this module, you will learn to design and run your first Java programs, including one program that prints “Hello!” in various countries’ languages and another where you will copy and edit many files by converting color images to grayscale. To accomplish these tasks, you will learn about classes constructed for this course: Libraries of iterables that allow you to perform the same task over multiple lines in a document or web page or multiple files within a directory. By the end of this module, you will be able to: Download and run BlueJ, the Java programming environment for this course; Access the documentation for the Java libraries specially designed for this course; Edit, compile, and run a Java program; Construct for loops in Java; and Use Iterables to run a program that iterates over multiple lines in a document or webpage or multiple f...

Welcome to “Welcome to “Java Programming: Solving Problems with Software”! We are excited that you are starting our course to learn how to write programs in Java, one of the most popular programming languages in the world. In this introductory module, you will get to meet the instructor team from Duke University, have an overview of the course, and hear from Google engineers about why they find programming exciting and why Java is important. Have fun!”! We are excited that you are starting our course to learn how to write programs in Java, one of the most popular programming languages in the world. In this introductory module, you will get to meet the instructor team from Duke University, have an overview of the course, and hear from Google engineers about why they find programming exciting and why Java is important. Have fun!

// write your code here //Function returns chopped pixel color values function pixchange(pixval){     var x = Math.floor(pixval/4) * 4;     return x; } //Code section chops bits of pixel colors of image that hides another image function chop2hide(image){     for(var px of image.values()){         px.setRed(pixchange(px.getRed()));         px.setGreen(pixchange(px.getGreen()));         px.setBlue(pixchange(px.getBlue()));     }     return image; } //Code Section used to shift bits of pixel colors of image to be hidden function shift(im){   var nim = new SimpleImage(im.getWidth(),im.getHeight());   for(var px of im.values()){     var x = px.getX();     var y = px.getY();     var npx = nim.getPixel(x,y);     npx.setRed(Math.floor(px.getRed()/64));     npx.setGreen(Math.floor(px.getGreen()/64)); ...

<p>The following picture was given with a hidden message to extract:</p> <center><img src = "http://i36.photobucket.com/albums/e42/Samksha/hiltonHiding2bitMessage_zpsze7d7x8e.png" /></center> <p>After extraction, this is what the hidden message was!</p> <center><img src = "http://i36.photobucket.com/albums/e42/Samksha/Part%203_zpsmdhehkly.png"/></center> <h3> Algorithm</h3> <p> The algorithm used for the extraction is similar to the one used for extraction in the first part.</p> <h3> Code</h3> <pre> function pchange(pixval) {     var x = (pixval-Math.floor(pixval/4)*4)*64;     return x; } function extract(image) {     for(var pixel of image.values())     {         pixel.setRed(pchange(pixel.getRed()));         pixel.setGreen(pchange(pixel.getGreen()));        ...

 Steganography Original Images This is the image that will be used to hide the second image! And this is the image that will be hidden in the first image! Sources for the images: https://www.hdwallpapers.net/abstract/colorful-diamond-wallpaper-674.htm https://www.hdwallpapers.net/abstract/dark-wood-texture-wallpaper-383.htm After the Hiding This is what the image looks like with the hidden value: And this is what the hidden image looks like after it is extracted: Algorithm The algorithm used to hide an image inside another using 2 bits is quite similar to the 4 bits, but has some distinctive differences. Instead of using 2^4, or 16, as the number used for dividing, we will be using 2^2, or 4. The first two bits of the image to be hidden are selected using the shift function. Since it's a 2 bit hidden message, we take the two most significant bits of the image we are hiding, i.e., "Diamond.jpg", by dividing the pixel value...

//Function returns chopped pixel color values function pixchange(pixval){     var x = Math.floor(pixval/4) * 4;     return x; } //Code section chops bits of pixel colors of image that hides another image function chop2hide(image){     for(var px of image.values()){         px.setRed(pixchange(px.getRed()));         px.setGreen(pixchange(px.getGreen()));         px.setBlue(pixchange(px.getBlue()));     }     return image; } //Code Section used to shift bits of pixel colors of image to be hidden function shift(im){   var nim = new SimpleImage(im.getWidth(),im.getHeight());   for(var px of im.values()){     var x = px.getX();     var y = px.getY();     var npx = nim.getPixel(x,y);     npx.setRed(Math.floor(px.getRed()/64));     npx.setGreen(Math.floor(px.getGreen()/64));     np...

function ensureInImage(coordinate, size){     //coordinate cannot be negative     if (coordinate < 0){         return 0;     }     //coordinate size must be between [0....size-1]     if (coordinate >= size){         return size-1;     }     else{         return coordinate;     }   } function getPixelNearby(image , x, y, diameter){     var dx = Math.random() * diameter - diameter/2;     var dy = Math.random() * diameter - diameter/2;     var nx = ensureInImage(x + dx, image.getWidth());     var ny = ensureInImage(y + dy, image.getHeight());     return image.getPixel(nx, ny); } //Select An Image from the list var image = new SimpleImage ("chapel.png"); //I'm gonna create a new image that is the same size as my starting image. var output = new SimpleImage(image.get...

function dist(pixel,x,y){     var dx = pixel.getX() - x ;     var dy = pixel.getY() - y ;     return Math.sqrt(dx * dx + dy * dy); } // start with a blank image var output = new SimpleImage(320,320); // write something here for (var pixel of output.values()){     if (dist(pixel,100,100) < 50 ){         pixel.setRed(255 - 4 * dist (pixel,100,100));     }     else if (dist(pixel,200,200) < 80 ){         pixel.setGreen(255 - 4 * dist (pixel,200,200));     }               else if (Math.random() > 0.995 ){         pixel.setRed(255);         pixel.setGreen(255);     }     pixel.setBlue(Math.max(1.05 * pixel.getY() - pixel.getX() ,  pixel.getX() - 1.5 * pixel.getY() )) } print (output); OR //all the points here are numbered in the same wa...

// write your code here function clearbits(colorval){     //compute the same color value with the lowest bits zeroed     var x = Math.floor(colorval/16)*16;     return x; } function setColor( r, g, b) {     for (var pixel of start.values()){         pixel.setRed(r);      pixel.setGreen(g);    pixel.setBlue(b);     } return start; } function chop2hide(image){     //for each pixel in the image     for (var px of image.values()){         //clear the lower values of red         px.setRed(clearbits(px.getRed()));         //clear the lower values of green         px.setGreen(clearbits(px.getGreen()));         //clear the lower values of blue         px.setBlue(clearbits(px.getBlue()));     }     return image; } ...

// write your code here function clearbits(colorval){     //compute the same color value with the lowest bits zeroed     var x = Math.floor(colorval/16)*16;     return x; } function chop2hide(image){     //for each pixel in the image     for (var px of image.values()){         //clear the lower values of red         px.setRed(clearbits(px.getRed()));         //clear the lower values of green         px.setGreen(clearbits(px.getGreen()));         //clear the lower values of blue         px.setBlue(clearbits(px.getBlue()));     }     return image; } function shift(image){     //for each pixel in an image     for (var px of image.values()){         //shift the red bits over         px.setRed(px.getRed()/16);   ...

// write your code here //selecting the image i wanted to enlarge var smallImage = ("smalllion.jpg"); //creating a blank image which is having twice as size of original image var bigImage =   ("smallImage.getWidth() *2 , smallImage.getHeight() *2"); for (var px of bigImage.values()){     var x = px.getX();     var y = px.getY();     var calx = Math.floor(x/2);     var caly = Math.floor(y/2);     var smallPixel = smallImage.getPixel(calx,caly);     px.setRed(smallPixel.getRed());     px.setGreen(smallPixel.getGreen());     px.setBlue(smallPixel.getBlue()); } print (bigImage);

function clearbits(colorval){     //compute the same color value with the lowest bits zeroed     var x = Math.floor(colorval/16)*16;     return x; } function chop2hide(image){     //for each pixel in the image     for (var px of image.values()){         //clear the lower values of red         px.setRed(clearbits(px.getRed()));         //clear the lower values of green         px.setGreen(clearbits(px.getGreen()));         //clear the lower values of blue         px.setBlue(clearbits(px.getBlue()));     }     return image; } function shift(image){     //for each pixel in an image     for (var px of image.values()){         //shift the red bits over         px.setRed(px.getRed()/16);         //shift t...

function setBlack(pixel) {      pixel.setRed(0);      pixel.setGreen(0);      pixel.setBlue(0);      return pixel; } function pixelOnEdgeDifferentThicknesses (pixel, image, vWidth, hWidth) {      var x = pixel.getX();      var y = pixel.getY();      if (x < vWidth) return true;      if (y < hWidth) return true;      if (x >= image.getWidth() - vWidth) return true;      if (y >= image.getHeight() - hWidth) return true;      return false; } var image = new SimpleImage("usain.jpg"); for (var pixel of image.values()) {      if (pixelOnEdgeDifferentThicknesses (pixel, image, 10, 40)) {                 pixel = setBlack(pixel);      } } print(image);

function setBlack(pixel) {      pixel.setRed(0);      pixel.setGreen(0);      pixel.setBlue(0);      return pixel; } function pixelOnEdge (pixel, image, borderWidth) {      var x = pixel.getX();      var y = pixel.getY();      if (x < borderWidth) return true;      if (y < borderWidth) return true;      if (x >= image.getWidth() - borderWidth) return true;      if (y >= image.getHeight() - borderWidth) return true;      return false; } var image = new SimpleImage("usain.jpg"); for (var pixel of image.values()) {     if (pixelOnEdge(pixel, image, 30)) {       pixel = setBlack(pixel);      } } print(image); OR function setBlack(pixel) {      pixel.setRed(0);      pixel.setGreen(0);     ...

Which one of the following is the correct implementation of moreRed ? // write your code here function moreRed(pixel, amount) {      var r = pixel.getRed() + amount;      if (r > 255)  r = 255;      pixel.setRed(r);      return pixel; } var image = new SimpleImage ("eastereggs.jpg"); print (image); for ( var pixel of image.values()){     if (moreRed(pixel, 200) ){             }     } print (image);

// write your code here function swapRedGreen(pixel) {      var newGreen = pixel.getRed();      var newRed = pixel.getGreen();      pixel.setGreen(newGreen);      pixel.setRed(newRed);      return pixel; } var image = new SimpleImage ("eastereggs.jpg"); print (image); for ( var pixel of image.values()){     if (swapRedGreen(pixel) ){             }     } print (image);

// write your code here function setBlack(pixel){     pixel.setBlue(0);     pixel.setGreen(0);     pixel.setRed(0);     return pixel; } function pixelOnEdgeDifferentThicknesses(pixel, image, borderWidth){     var x = pixel.getX();     var y = pixel.getY();       if (x < borderWidth) return true;     if (y < (borderWidth+40)) return true;     if (x >= image.getWidth() - borderWidth) return true;     if (y >= image.getHeight() - (borderWidth+40)) return true;     return false; } var image = new SimpleImage ("lion.jpg"); print (image); for ( var pixel of image.values()){     if (pixelOnEdgeDifferentThicknesses(pixel, image, 25) ){         pixel = setBlack(pixel);     }     } print (image); Here is the island picture with a border around it: Here is a picture of the island with differe...

// write your code here function setBlack(pixel){     pixel.setBlue(0);     pixel.setGreen(0);     pixel.setRed(0);     return pixel; } function pixelOnVerticalEdge(pixel, image, borderWidth){     var x = pixel.getX();     var y = pixel.getY();       if (x < borderWidth) return true;         if (x >= image.getWidth() - borderWidth) return true;     return false; } function pixelOnHorizontalEdge(pixel, image, borderWidth){     var x = pixel.getX();     var y = pixel.getY();     if (y < borderWidth) return true;         if (y >= image.getHeight() - borderWidth) return true;         return false; } var image = new SimpleImage ("lion.jpg"); print (image); for ( var pixel of image.values()){     if (pixelOnHorizontalEdge(pixel, image, 25) ){      ...

// write your code here function setBlack(pixel){     pixel.setBlue(0);     pixel.setGreen(0);     pixel.setRed(0);     return pixel; } function pixelOnEdge(pixel,image,borderWidth){     var x = pixel.getX();     var y = pixel.getY();     if (x < borderWidth) return true;     if (y < borderWidth) return true;     if (x >= image.getWidth() - borderWidth) return true;     if (y >= image.getHeight() - borderWidth) return true;     return false; } var image = new SimpleImage ("lion.jpg"); print (image); for ( var pixel of image.values()){     if (pixelOnEdge(pixel,image,10)){         pixel = setBlack(pixel);     } } print (image);

// write your code here function swapRedGreen(pixel){     G = pixel.getGreen();     R = pixel.getRed();     if (G >= 200 ){         pixel.setRed(255);         pixel.setGreen(0);         return true     }     if (R >= 200){         pixel.setRed(0);         pixel.setGreen(255);         return true;     } } var image = new SimpleImage("smallhands.png"); print (image); for (pixel of image.values()){     pixel = swapRedGreen(pixel); } print (image);