Java

27-Nov-18 1:38

Without more information it is anyone's guess where that error occurs, and why. Please edit your question and explain exactly what your code is trying to do (you can show an extract of where the error occurs).

You should also check RAW_XML_FILE_HEADER - Google Search[^].

mohit gite14-Nov-18 23:16

14-Nov-18 23:16

Hi everyone. I am new to Java and not even sure it can accomplish what I am trying to do. I have been asked to try to come up with a web based program that will create numbers in a sequential order....IE: 001, 002, 003.....upon every press of a button. I need these numbers to be able to be stored so that the next time someone else loads this up and presses the button, it will produce the next number in the sequence. It also has to work across many workstations and users. Is this even possible? Or should I look at another option? I thought Java might be the best option, seeing how easy it is to implement into HTML. Any help would be greatly appreciated.

Richard MacCutchan15-Nov-18 0:29

15-Nov-18 0:29

Yes it is possible. You will need HTML and Javascript (not Java) for the front end. That will allow you to display the numbers and use a button for actions. Then you will need a suitable backend to save the last number created on the server. You could use Java, PHP or one of the .NET languages. Use Google to find samples of simple web applications in your language of choice.

jschell21-Nov-18 7:41

jschell

21-Nov-18 7:41

Would javascript even be needed?

First display screen could be all html. Then button is just url request to load 'another' page which just returns the first (html) page with the new number.

Can't one do that in just html?

Richard MacCutchan21-Nov-18 22:06

21-Nov-18 22:06

Quite possibly, but how would you increment the number?

jschell15-Dec-18 6:05

jschell

15-Dec-18 6:05

The button causes another page to load. That new page has a button - with a different index.

mohit gite21-Nov-18 23:54

21-Nov-18 23:54

Thanks for the suggestion.

java applet programm

mohit gite12-Nov-18 22:40

12-Nov-18 22:40

Hi
Can my gif file be made use of to modify the same so that the elecopter.gif starts flying up
An applet java prg does this .(java applet program shown )How to modify my gif file
to function like the java prg or how to get the java plug for this.

<HTML>
<HEAD>
<TITLE></TITLE>
</HEAD>
<BODY>
/**
import java.applet.Applet;
import java.awt.*;
import javax.swing.*;
 
public class Animate  extends Applet {
   public void paint(Graphics g)
   {
       Image img = getImage(getDocumentBase(),"Elecopter.gif");
 
        for(int y=100;y<980;--y){
 
    g.drawImage(img, 1, y ,null);
 
        try
    {
    Thread.sleep(20);
    }
    catch(InterruptedException ue)
    {  }
   }
 
    }
    }*/
     
    <img src="Elecopter.gif" width="428" height="640"  border="0">
</BODY>
</HTML>

modified 21-Nov-18 4:30am.

Re: java applet programm

Richard MacCutchan13-Nov-18 5:08

13-Nov-18 5:08

What happens when you try it?

First Android App

C-P-User-311-Nov-18 21:30

C-P-User-3

11-Nov-18 21:30

Okay, I have scoured the internet for tutorials on writing Java on an Android.

So far, I think I would have a better chance of learning how by watching television commercials.

Okay, here's my goal; admittedly modest, but if the gang here can direct me, I'll be miles ahead from what the internet has to offer.

Spec: A Java App
Platform: Android phone
Function: None (It doesn't do anything)

All I want to do first is to write an Android app which...

Just appears on the screen
Doesn't accept any input
Doesn't produce any (meaningful) output
Doesn't interact with any other app in any meaningful way
Goes away properly when you close it.

I intend to install the latest version of Android Studio on my desktop computer this week; Monday if possible, hopefully by Friday at the latest if my boss gives me a day or two off.

Okay, so, if I can properly install the current Android Studio; where is the first place I click ? What do I do ? I want to be able to move between computers, so I'll want the source files on a thumb drive.

Let's call this app: "DEADBEAT" Sound like a winner ?

What's my next step ?

Re: First Android App

Richard MacCutchan11-Nov-18 22:02

11-Nov-18 22:02

C-P-User-3 wrote:
I have scoured the internet for tutorials on writing Java on an Android.

But you forgot to scour https://www.codeproject.com/KB/android/#Android+Tutorial+Contest[^]

Re: First Android App

C-P-User-313-Nov-18 20:14

C-P-User-3

13-Nov-18 20:14

Okay, I'll try that.

Thanks

(Voted your comment up one)

Member 1404304811-Nov-18 1:07

Member 14043048

11-Nov-18 1:07

hi..how can I define 10 books in a new class...that the books have name,writherName and a code?
then show them to user as a list?

Richard MacCutchan11-Nov-18 2:31

11-Nov-18 2:31

Go to The Java™ Tutorials[^] and see : Trail: Learning the Java Language (The Java™ Tutorials)[^]
Trail: Essential Classes (The Java™ Tutorials)[^]
and Trail: Collections (The Java™ Tutorials)[^]

Scala Code Review

traubad10-Nov-18 12:46

traubad

10-Nov-18 12:46

Hey all, I'm not sure where to post this but I hope it's ok to throw it in here. I'm currently learning Scala and I come from more of a Java, C++, Python background. I wrote some code just to sort of figure some stuff out and experiment a bit. I'd love some some feedback, particularly regarding technique and convention and whatnot. The following code will run. I'm doing some simple lazy evaluation of primes. Thanks again.

import scala.collection.mutable.MutableList
import scala.collection.Iterable
import scala.io.{StdIn => input}

object Main {
  
  def main(args: Array[String]): Unit = {
    var primeList = MutableList[Int]()
    var primeFinder = Iterator.from(2)
    nPrimes(primeFinder, primeList)
    //oneAtATime(primeFinder,primeList)
  }
  
  def oneAtATime(primeFinder: Iterator[Int], primeList: MutableList[Int]): Unit = {
    println("We are lazily finding all the primes!")
    do {
      nextPrime(primeFinder,primeList)
      println("So far, we have: " + primeList.mkString("[",",","]"))
      println("Continue?(press n to quit): ")          
    } while (input.readLine().toLowerCase() != "n")    
  }
  
  def nPrimes(primeFinder: Iterator[Int], primeList: MutableList[Int]): Unit = {
    println("How many primes would you like to find? ")
    val totalPrimes = input.readInt()
    for( i <- 1 to totalPrimes) nextPrime(primeFinder, primeList)
    println("First "+totalPrimes+" primes: " + primeList.mkString("[",",","]"))
  }
  
  def nextPrime(primeFinder: Iterator[Int], primeList: MutableList[Int]): Unit = {
    var isPrime = (n: Int, primes: Iterable[Int]) => (primes.takeWhile(p => p*p <= n).forall(n % _ != 0))
    var primeVal = primeFinder.next()
    while (!isPrime(primeVal,primeList)) primeVal = primeFinder.next()    
    primeList += primeVal      
  }    
}

Re: Scala Code Review

Richard MacCutchan10-Nov-18 21:07

duplicate elmente in Array multiply

10-Nov-18 21:07

It's not Java, so most likely better posted in https://www.codeproject.com/script/Answers/List.aspx?tab=active[^].

Nasif228-Nov-18 13:08

Nasif22

8-Nov-18 13:08

hi.
i have to do a code that it will find duplicate element and multiply them to give new array
and if there ist any negative elment muss a Recursion this array correct.

ihope that some one kann help me
thank you

Member 140430484-Nov-18 23:51

Member 14043048

4-Nov-18 23:51

hi..how can I scan a number from a user..and save it?

Richard MacCutchan5-Nov-18 5:17

5-Nov-18 5:17

Probably by using some sort of scanning device. But without more information it is impossible to be sure.

mohit gite16-Nov-18 21:25

16-Nov-18 21:25

#include <stdio.h>
int main()
{
    int number;

    // printf() dislpays the formatted output 
    printf("Enter an integer: ");  
    
    // scanf() reads the formatted input and stores them
    scanf("%d", &number);  
    
    // printf() displays the formatted output
    printf("You entered: %d", number);
    return 0;
}
Output

Enter a integer: 25
You entered: 25

GiteHrudaya28-Nov-18 18:48

GiteHrudaya

28-Nov-18 18:48

import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

public static void main(String[] args) {
int i = 4;
double d = 4.0;
String s = "HackerRank ";

Scanner scan = new Scanner(System.in);
int i1;
double d1;
String s1;

i1 = scan.nextInt();
d1 = scan.nextDouble();
s1 = scan.nextLine();
s1 = scan.nextLine();

System.out.println(i+i1);
System.out.println(d+d1);
System.out.println(s+s1);
scan.close();
}
}

GiteHrudaya2-Dec-18 22:59

GiteHrudaya

2-Dec-18 22:59

import java.util.Scanner;

public class test
{
    public static final int SENTINEL = -1;
    public static void main(String[] args) {
        Scanner kb = new Scanner(System.in);
        int score = 0;
        int sum = 0;

        System.out.println("Enter numbers here");
        while (score >= 0) {
            if (score <= -1) {
            score = kb.nextInt();
            sum += score;
            score = 0;
        }
            System.out.println(sum);
    }
  }
}

mohit gite4-Nov-18 21:45

4-Nov-18 21:45

If there are any deadlock cases in production environment, then, how can we identify it?

Richard MacCutchan4-Nov-18 23:05

4-Nov-18 23:05

Code analysis, unit testing, full testing etc. Try Google (again) to find research papers on the subject.