Passing Parameters - Randomly Generated Numbers Not Appearing
Dec 14, 2014
For some reason, when I test out my code, my randomly generated numbers don't appear. Here is a sample result:
> What do you want to generate, integer, double, or character?
>integer
>What is the upper limit and lower limit of the integers you want to generate?
>1
>10
>How many integers do you want to generate?
>10
>BUILD SUCCESSFUL (total time: 9 seconds)
Is this because my code is not passing my parameters correctly? I'm not sure how to fix this either.
Here is my code for reference (it's not completed at the moment)
import java.util.Scanner;
public class NewNumberCharacter {
/** Main method
* @param args */
public static void main(String[] args) {
int return_int;
double return_double;
i am trying to print out a randomly generated array, but i only get
[I@7852e922
i did some research and the "[" is for arrays, "I" is for the int and "@" is the hash. and the rest is some sort of hex. I need to override this in a way, but i can't seem to find out how. this is my current code:
import java.util.Random;
public class Oppgave { public static void main(String[] args){ int myint[] = fyll(); System.out.println(myint); } public static int[] fyll() {
I am getting a strange error and it almost seems like its not comparing it to the random generated number just the guess that i entered before. Here are my error messages.
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at guess.the.numbers.GuessTheNumbers$ButtonHandler.actionPerformed(GuessTheNumbers.java:119) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
I have this program where I'm supposed to fill an array with 1000 indices with 1000 randomly generated numbers between 1 and 1000. The program is supposed to check if any of the numbers match an index that is the same value (so for example, the number 4 is in index 4). How to check for that condition, especially using a binary search (I'm also told to use a binary search).
Right now the variable index isn't initialized because I don't know what to initialize it to exactly. How do I check to see if any numbers match the value of the same index?
import java.util.*; public class Identity { public static void main(String[] args) { int [] integers = new int [1000]; // Fill array with randomly generated numbers int [] display = GenerateRandom(integers);
I'm trying to pass a parmeter to a jsf page from a servlet(i.e. associated with paypal adaptive api), but I keep getting the following error, even though the productType on ProductDetailsVO is a String.
INFO: WARNING: FacesMessage(s) have been enqueued, but may not have been displayed.
must be a number consisting of one or more digits.), detail=(j_idt2: '45;productType=Sport' must be a number between -2147483648 and 2147483647 Example: 9346)]
Calling JSF page contains:-
returnURL = new URL(new URL(request.getRequestURL().toString()),"pages/paypalpaymentapproved.xhtml?paypalID="+paypalID+";productType=Sport"); response.sendRedirect(returnURL.toString());
I am writing a program that creates an array with random numbers. Then the user can choose what number of the array he/she wants to check the occurance of. This works fine, but the numbers generated seems very weird, only 2 of the 10 possible numbers are generated. 0 and one of the other 9 numbers, the 0 is always 10100 and the other one is always 101.
import java.util.Random; import java.util.Scanner; public class OppgaveC { public static void sjekk() { int randomArray[]=new int[101]; int countArray[]=new int[10]; Random rand = new Random();
[Code] ....
it also says i have a memory leak on my scanner, ow can i close this?
So I have an application where the user logs in (using j_security_check). User is taken to a welcome page where user's name is displayed as a link. When clicking that link I would like to take the user to a page where the user is able to update the credentials (password, address, etc). In this way the user only has access to the link related to that specific user's credentials. I am trying the following structure:
public String selectedUser() { userName = FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap().get(userName); selUser=uServ.findByName(userName); return "UpdateUser";
[Code] ....
The last line of the stack suggests that a null PK value is being picked up by the FacesContext method in the backing bean. I'm confused because the userName string IS the primary key of the user table which is structured like this:
My task is to make a mortgage calculator where the user selects which calculation they want the program to do via a menu. I got the menu to work and it keeps on looping until terminated so that's good. The starts when I want the user's choice (P, I or T) to be used in another method which will then execute another set of code (the calculation that needs to be done). I think passing parameters and return statements are what I need to use, but after reading and watching videos, I'm still not sure how to implement it into my program. For now, I want the user to input the letter "P" and then I want that information to be passed to the method, loanCalculator() where the if statement will make a decision to call the method, calcPayment and display the number 0 via the console. Once it can do that, I'll fill in the calculation methods with the proper code since I can at least navigate the user input to its associated calculator. It just keeps on looping the menu without going through the other methods.
import java.util.Scanner; //Example of "big loop" in main to repeat using a No Trip (0,N) test first public class Mortgage { // constants static double loanAmount; static double interestRate; static int term;
How to use the id parameter in my documents entity to download documents from a list of documents. Normally I use ListDataModel and the getRowData method. I would like to know how to achieve the same thing using an ordinary List object.
My list of documents is called List<CountryDocs> selectedDocs;
Clicking on the download link calls the following method in my managed bean:
@ManagedBean(name = "countryDocBean") @SessionScoped public class CountryDocBean { private List<CountryDocs> selectedDocs; public StreamedContent getDownloadedFile() {
[Code] ....
Debugging shows the value for the id is 0 and this results in a NullPointerException. I've tried several methods for grabbing the document id in my backing bean, but no luck yet. I also read about the the ViewParams and ViewAction method but they caused validation errors to do with the <f:metadata> tags. I don't know how to obtain this value using a normal List object.
import java.util.ArrayList; import java.util.Random; public class NumSorting { public static int numOfComps = 0, numOfSwaps = 0; public static void main(String[] args)
[Code] ....
What is wrong with my code in this sorting program? It won't copy the random generated numbers to the sort method. How to get the random generated numbers to copy to the sort method. Below is what the program is displaying.
how to translate it into Java language due to lack of experience (2 weeks). My solution I've formed in my head is: create a new array for the numbers that are in improvement and then declare a "max" variable. Check which array's length is higher and print that length. What I don't know to do is: I don't know how to create a new array for each numbers that are passing through the condition.
Note: I couldn't find anything on internet about my problem so that's why I'm here.
My code is this one:
class MyClass { static int progresie=0; public static void longest_improvement(Integer[] grades) { for(int i=0;i<grades.length-1;i++){ if(grades[i]<=grades[i+1]){ progresie ++; } } System.out.println(progresie); } }
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package com.thecherno.rain; import java.awt.Canvas; import java.awt.Dimension; import javax.swing.JFrame; public class Game extends Canvas implements Runnable{ private static final long serialVersionUID = 1L;
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where options include:
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I found some documentation on WS-A online, but so far could not find an answer.
