Java Generics difference between wildcard and generic parameter type

Java Generics difference between wildcard and generic parameter type

Could someone explain to me why the third method doesnt compile?
public class Test{
public <K> void test(List<K> list){ //Compiles
K n = list.get(0);
}
public void test(List<? extends Number> list){ //Compiles
Number n = list.get(0);
}
public <K> void test(List<K extends Number> list){ //Doesn't compile !!
Number n = list.get(0);
}
}

Replacing/removing a line in a text file in java

Replacing/removing a line in a text file in java

public void removeLine() {
try {
File dir = new File("chars");
if(dir.exists()) {
String read;
File files[] = dir.listFiles();
for (int j = 0; j < files.length; j++) {
File loaded = files[j];
if (loaded.getName().endsWith(".txt")) {
Scanner s = new Scanner (loaded);
while (s.hasNextLine()) {
read = s.nextLine();
if (read.contains("char-15")) {
read.replace(read, "");
System.out.println(loaded.getName() +" -
Data: "+read);
break;
}
}
}
}
}
} catch (Exception e) {
}
}
What this should do is replace each line that contains "char-15", with an
empty String.
When I run this though, it doesn't delete the line in all the files. I
can't do this manually as there are well over 5000 files.
How can I make it delete this specific line in all of the files?

save image to server from canvas

save image to server from canvas

hi i wanna take image from webcam and save it in server;i use following
code but it does not work.my code take pic and show it in mycanvas but
when i want to get image from mycanvas and send it to server ajax function
does not work.
var webcam = (function () {
var video = document.createElement('video'),
photo = document.getElementById("myCanvas");
function play() {
if (navigator.getUserMedia) {
navigator.getUserMedia({ video: true,
audio: true, toString: function () { return
"video,audio"; } }, onSuccess, onError);
} else {
changeStatus('getUserMedia is not supported
in this browser.', true);
}
}
function onSuccess(stream) {
var source;
if (window.webkitURL) {
source =
window.webkitURL.createObjectURL(stream);
} else {
source = stream;
// Opera and Firefox
}
video.autoplay = true;
video.src = source;
changeStatus('Connected.', false);
}
function onError() {
changeStatus('Please accept the getUserMedia
permissions! Refresh to try again.', true);
}
function changeStatus(msg, error) {
var status = document.getElementById('status');
status.innerHTML = msg;
status.style.color = (error) ? 'red' : 'green';
}
var status = document.getElementById()
function setupPhotoBooth() {
var takeButton =
document.getElementById('btnTakePicture');
takeButton.addEventListener('click', takePhoto,
true);
var saveButton =
document.getElementById('btnSave');
saveButton.disabled = true;
saveButton.addEventListener('click', savePhoto,
true);
}
function takePhoto() {
// set our canvas to the same size as our video
photo.width = video.width;
photo.height = video.height;
var context = photo.getContext('2d');
context.drawImage(video, 0, 0, photo.width,
photo.height);
// allow us to save
var saveButton =
document.getElementById('btnSave');
saveButton.disabled = false;
var data = photo.toDataURL("image/png");
data = data.replace("image/png", "");
document.getElementById("<%= eventdata.ClientID
%>").value = data;
}
return {
init: function () {
changeStatus('Please accept the permissions
dialog.', true);
video.width = 320;
video.height = 240;
document.body.appendChild(video);
document.body.appendChild(photo);
navigator.getUserMedia ||
(navigator.getUserMedia =
navigator.mozGetUserMedia ||
navigator.webkitGetUserMedia ||
navigator.msGetUserMedia);
play();
setupPhotoBooth();
} ()
}
})();
function UploadPic() {
// generate the image data
var Pic =
document.getElementById("myCanvas").toDataURL("image/png");
// var Pic =
document.getElementById("eventdata").toDataURL("image/png");
Pic = Pic.replace(/^data:image\/(png|jpg);base64,/, "")
// Sending the image data to Server
$.ajax({
type: 'POST',
url: 'Save_Picture.aspx/UploadPic',
data: '{ "imageData" : "' + Pic + '" }',
contentType: 'application/json; charset=utf-8',
dataType: 'json',
success: function (msg) {
alert("Done, Picture Uploaded.");
}
});
}

C++ error C2228

C++ error C2228

I'll admit I'm not sure of what I'm doing here, so I am doing a lot of
copying sample code from my textbook and replacing with info for my own
program... but can tell me what is causing this error?
Car.cpp
// Implementation file for the Car class
#include "Car.h"
// This constructor accepts arguments for the car's year
// and make. The speed member variable is assigned 0.
Car::Car(int carYearModel, string carMake)
{
yearModel = carYearModel;
make = carMake;
speed = 0;
}
Car.h
// Specification file for the Car class
#ifndef CAR_H
#define CAR_H
#include <string>
using namespace std;
class Car
{
private:
int yearModel; // Car year model
string make; // Car make
int speed; // Car speed
public:
Car(int, string); // Constructor
};

Change a text file in random access

Change a text file in random access

I have a Text file and want to Change it in some places for example in
4030 t0 4060, in this way :if there is a character 'C' or 'c' followed by
'G' or 'g' ,must be changed in 'B' character ,the input file is a text
file and i want to get a changed text output file , there is no random
access in text file and must open file in binary form and make changes but
the output file will be binary and i dont have any idea to get a text
output .the codes are in below:
int main()
{
string str,cstr;
ReadTextFile("in",4030,4060);
return 0;
}
string ReadTextFile(string path, int from, int to)
{
fstream fp(path.c_str(),ios::in|ios::out| ios::binary);
char * target;
string res,str;
target = new char[to - from + 1];
if (!target)
{
cout << "Cannot allocate memory." << endl;
return "";
}
fp.seekg(from);
fp.read(target, to - from);
target[to - from] = 0;
res = target;
str=changestring(res);
fp.seekg(from);
fp.write((char *)&str,to-from);
return res;
}
string changestring(string str)
{
int l=str.length();
l=l-1;
for(int i=0;i<= l;i++)
{
if(str[i]=='C' || str[i]=='c')
{
int j=i+1;
if(str[j]=='G' || str[j]=='g')
str[i]='B';
}
}
return str;
}

How do I float one image on top of another?

How do I float one image on top of another?

I've done some searching on this topic, but I can't seem to find an answer
that's exactly what I'm looking for.
I'm trying to set up a banner ad (728 x 90) on my site so it is "laid
over" a div with a background image. Therefore, if someone has an
adblocker, they'll see an image that says "please disable your adblock"
where the ad should be.
My current code is this:
<div style="float: left; background-image:
url(../forum/banners/replacement.png); height: 90px; width: 728px; border:
1px solid black;">
</div>
<!-- BEGIN SMOWTION TAG - 728x90 - DO NOT MODIFY -->
<script type="text/javascript">
<!-- ad code goes here -->
</script>
<!-- END SMOWTION TAG - 728x90 - DO NOT MODIFY -->
However, this makes the ad show up under the div, instead of appearing
'overlaid' on it. How can I make it so that the ad and the div don't clip?

Hide variable value

Hide variable value

I'm writing a small Android app and I need to hide some variable values. I
have a API key I got from the content provider who is providing me content
to show in my app that I need to retrieve data from them. Because it is
being used in an encryption algorithm, it is of vital importance the code
isn't leaked.
I need to save the API key in my code and be sure it isn't retrievable by
the bad people in the world. What I do now, is save them in my code as a
variable:
private static final String API_KEY="mysupersecreatapikey";
After the app is compiled to an APK file, this is, in my opinion not
retrievable anymore. Am I doing it in the right way now, or is there a
better solution?
Thx in advance, Daryl