Better Way To Remove Null Values From Array

Dec 1, 2014

Is there a better way to remove null values from an array than what I have tried? This works just fine, but I just get the feeling that there is a better way to do this, without using the JCF.

private static String[] removeNullValues(String[] list){
int count = 0;
for(int i = 0; i < list.length; i++){
if(list[i] == null)
count++;

[Code] ....

I technically dont need to remove the null values for the project that I'm working on (since I just print it out and I can avoid null values with a simple statement like

if(update[i] != null) SOP(update[i])
),

but I'm just curious.

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Increase Size Of Array But Getting Null Values

Dec 3, 2014

I'm working on a program to create a blackjack game using objects (one for card, deck. and hand). Withing my hand object I am trying to add cards to the hand but it is only adding the last card i try to add and giving null values for the the ones before.

class BlackJackHand {
private BlackJackCard [] hand;
public void addToHand(BlackJackCard c) {
if (hand == null) {
BlackJackCard [] tempHand = new BlackJackCard[1];
tempHand[0] = c;
hand = tempHand;

[Code] ....

What I want this section to do is add cards to the current hand. I was intending for it the hand to be null at first and the if(hand == null) piece to add the card the first time and then the else piece would be used when the hand already has at leas one card. I want the else section to create a temporary array that is one larger than my current hand, copy the cards from the old hand to the new hand, and then add a new card to the last space before rewriting the old hand as what the temporary hand is.

The code I am using to test if the addToHand() is working is

class BlackJackTest
{
public static void main (String[]args) {
BlackJackCard c1= new BlackJackCard(1,0);
BlackJackCard c2= new BlackJackCard(1,4);
BlackJackCard c3= new BlackJackCard(1,5);
BlackJackHand h1 = new BlackJackHand();

[Code] .....

BlackJackCard has the parameters (int suit, int value)

This should print:
ace of clubs
4 of clubs
5 of clubs

but instead prints:
null
null
5 of clubs

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Replacing Null Values Within Multidimensional Array

Feb 18, 2014

I have a file which contains certain positions ([a][b]) that require to be placed in a certain multi-dimensional array. For example I might have an array String[][] that is a size of 6x6 but only have values in positions [2][1] and [3][2]. Because it is important for me to maintain the given array size and also do certain actions with the given positions I cannot modify the size. In addition I need to count the surrounding neighbors each element has (including elements that are null). However because some of my further code cant process with null elements I need to remove all null elements with " " (blank).

I am not sure how this is done or if it's even possible. If it is not possible how can I do something as close as possible to my needs?

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Remove All Numbers From Queue And Push Onto Stack Until Operator Is Reached - Null Pointer Exception

Apr 26, 2015

This method keeps throwing a NullPointerException. Not only that, but its not doing what I want it to do.

Heres the code:

/*
Remove all the numbers from the queue and push onto the stack until an operator is reached
*/

private static void processQueue() {
// Check what is at the front of the queue. If an operator is found or the queue is empty, exit method.
while(queue.front() != null || !queue.front().equals("*") || !queue.front().equals("/") || !queue.front().equals("%")
|| !queue.front().equals("+") || !queue.front().equals("-"))
{
stack.push(queue.removeFront()); // push the operand onto the stack
}
}

Here is the method that calls the processQueue() method

/*
Process the mathematical expression using a stack and a queue
*/
private static double processExpression() {
// insert all elements from the stack to the queue for processing
while(stack.top() != null) {
queue.insertBack(stack.pop());

[Code] .....

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JSP :: How To Print Null Values In EL

Dec 18, 2014

The value is: ${object1.property1} If the value of the property is null, I want "null" to be printed, like this:

The value is: null But I get an empty string, like: The value is:

I know I can use a ternary operator, but isn't there a simpler/shorter solution? A function (like NVL() in SQL)?

The value is: ${empty object1.property1 ? "null" : object1.property1 }

Not only is this long, but the value expression is typed twice, which is a magnet for bugs.

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Compact Test For Any Of 4 Values Being Null

Apr 7, 2014

Any compact if statement or any type of test for checking if atleast ONE out of 4 integers is null. So 1 of all, 2 of all, 3 of all, or all of them being null will give a specific result ELSE do something else.

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Objects Keep Printing Null And Zero Values?

Nov 3, 2014

Everything is written up and looks good and i get no compile errors but every student object other than the default constructor has null and zero values when printed.
 
import java.text.DecimalFormat;
import java.lang.Math;
public class Student
{
//instantiate variables
 
[Code] .....

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String Comparison When Both Values Are Null

Aug 5, 2014

In Java is there  a method which  I can use to compare two Strings where in if both the values are null, they should be considered as equal?

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JSF :: Getting Null Values From XHTML Page To Java Code

Nov 13, 2014

My project consists of a web app where a user can select a area from a picture and f.e. if it is a office layout he can input the worker name and any peace of hardware that the area might have. In this case there are two categories: Hardware and Computer. Hardware - it has 5 dropdown lists consisting of printer, scanner and etc. Computer - like Hardware consists of many dropdown lists which add up to components such as processor, motherboard and etc. For me, considering this is my first ever web app project, is a huge step towards web development, I have used various mixes of Java, javascript and primefaces code.

My current problem: When a user selects an area he gets a dialog box where he is prompted to select his desired input, afterwards the user clicks the 'save' button and get's another dialogbox which has a resume of what he has selected so he could check out his input and save it by clicking the 'save' button in the resume box. My problem is that when the user clicks the save button the button calls a method which takes all the input and creates an Area object (Area object consists of various objects such as: Coordinates, Dimensions, Employee, ComputerList and HardwareList) and sends a query to the database, but all the values I get is null.

XHTML code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:ui="http://java.sun.com/jsf/facelets" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core" xmlns:p="http://primefaces.org/ui">

[Code] ....

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Remove Duplicate Elements In Array Using With Java

Apr 30, 2014

remove duplicate elements in array using with java

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Find And Remove All Occurrences Of Given Integer And Return Amended Array

Jan 12, 2014

Question - Given an specific integer and an array of integers, find and remove all occurrences of the given integer and return an amended array. I solved it. Here is my solution -

public static void main(String[] args) {
int[] nums = {1, 2, 3, 4, 4, 4, 5, 6, 7, 8, 8, 8, 8, 7, 7, 9};
int input = 8;
int newLen = nums.length;
for(int i=0; i<newLen; i++){
if(nums[i] == input){

[Code] ....

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What Is The Length Of A Null Array Object

Feb 21, 2014

I tried the following and it gives me null pointer exception. I just want to verify if what is the actual value of a length of an array?

Object [] obj = null;
System.out.println("length:" + obj.length);

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Check If Array Elements Are Null?

Jan 6, 2015

B is an array Object, as you can see if an element is null or not?

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Method Is Not Returning Array - Null Error

May 18, 2015

I am trying to return an array and I keep getting a null error. The below class sets the material numbers into an array and should return that array if called :

public class Jobs {
private int[] materialsNumber;
//change to parts and create another class that gets the materials for the parts
 public int[] job1() {
materialsNumber[0] = 11960120;

[Code] ....

I later try to call the method. The program executes but stops after I println "test in loop"

public class PurchaseOrdersToParts {
 private Jobs job = new Jobs();
 int[] getPartsForPurchaseOrder(BigDecimal purchaseOrder) {
 System.out.println("inside getparts");
 BigDecimal testNum = new BigDecimal(123.0);
 
[Code] ....

This is the method that is calling the method in the GenerateOrdersToParts class

private PurchaseOrdersToParts purchaseOrdersToParts = new PurchaseOrdersToParts();
 @Inject
PoRepository poRepository;
public GenerateShopJobTickets() {
 
[Code] .....

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Dijkstra's Algorithm - Array Full Of Null Data

May 6, 2014

I'm trying write a Dijkstra's implementation in java. First off, here is the algorithm:

package lab3;
import java.util.HashMap;
import java.util.Stack;
 
/**
* Compute shortest paths in a graph.
*
* Your constructor should compute the actual shortest paths and maintain all the information needed to reconstruct them. The returnPath() function should use this information to return the appropriate path of edge ID's from the start to the given end.
*
* Note that the start and end ID's should be mapped to vertices using the graph's get() function.
*/
class ShortestPaths {
Multigraph graph;
final int INF = Integer.MAX_VALUE;
PriorityQueue<Integer> Q;

[Code] ....

I followed someone else psuedocode very closely but for whatever reason, my edge[] array is just full of null data, which means I can't actually return the shortest path. Why that's happening/how to fix it? Maybe I'm not understanding dijstra's correctly.

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Null Detected In String Array Not Saved By Class Constructor

Mar 12, 2014

I've a vertical-bar-delimited file where most elements contain text, some contain whitespace, and some are empty. Examples:

62RG|fe|Pencil Financial Group, LLC||doug@pencil.com|||85637889|Cross, Ben|bcross@godaddy.net|Bernard|Cross|Ben||315 One Tree Hill Terrace|Lafayette|LA

62RG|fe|Pencil Financial Group, LLC||tracy@pencil.com|||13658734|Dustin Cardwright|dcart@motorola.com|Dustin|Cartwright|||| |LA

which I parse and store with

String str_arry = innline.split( "|", 17);
lisst.add( new Contact( str_arry));

and my Contact class has the constructor

public Contact( String[] str_arry) {
for( int ii = 0 ; ii < str_arry.length ; ii++ ) {
if( str_arry[ii].matches("^s+$")) {
str_arry[ii] = null;
System.out.println("hit a null");

[Code]...

I expect the for-loop in the constructor to find any elements containing whitespace characters and set them to null for subsequent assignment.And when the code runs I do see some hit-statements pop up, so the detecting part is working.

But when I then process the list and access a Contact object and test fields for nulls I don't find any ie

if( aContactObj.getfFCity() == null) System.out.println("city is null");

never prints when it should.

What's the trick? Or is my approach wrong and if so what should it be?

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Method That Returns New Array By Eliminating Duplicate Values In Array

Jun 15, 2014

Write a method that returns a new array by eliminating the duplicate values in the array using the following method header: public static int[] eliminateDuplicates(int[] list). The thing is that I found the working solution that is written below, but how it works. How to eliminateDuplicates method done with flag and flag2.

Here is the code:

Java Code:

import java.util.Scanner;
public class Exercise06_15 {
public static void main(String[] args) {
java.util.Scanner input = new java.util.Scanner(System.in);
int[] numbers = new int[10];
System.out.println("Enter ten numbers: ");

[code]....

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Removing Item From String Array - Null Pointer Exception Error

Jun 8, 2014

Question 1: I am working on an assignment where I have to remove an item from a String array (see code below). When I try to remove an item after entering it I get the following error "java.lang.NullPointerException." I am not sure how to correct this error.

Question 2: In addition, I am having trouble figuring out how to count the number of occurrences of each string in the array and print the counts. I've been looking at other posts but they are more advanced and I have not yet learned how to use some of the tools they are referring to.

private void removeFlower(String flowerPack[]) {
// TODO: Remove a flower that is specified by the user
Scanner input=new Scanner(System.in);
System.out.println();
System.out.println("Please enter the name of the flower you would like to remove:

[Code] ....

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Transfer Random Array Values To A Separate Array?

Feb 16, 2015

filling out a Random array: An Array of Specific Length Filled with Random Numbers This time what I need to do is take the elements from this Random array and assign them to a new Byte array:

for(int i = 0; i < limit-10; i++) {
Random dice = new Random();
int randomIndex = dice.nextInt(array.length);
if (array[randomIndex] < 128) {
System.out.print(array[randomIndex] + " ");
} else if (array[randomIndex] >= 128) {
System.out.print(array[i] + " ");
}

byte[] noteValues = new byte[]

{ 64, 69, 72, 71, 64, 71, 74, 72, 76, 68, 76 }; //This is the byte array filled manually!

I've tried amending the manual input to fit in with the Random array, as follows:

byte[] noteValues = new byte[]
{ array[randomIndex] };

In this case, however, the Byte array can't interpret the int values. Also, if the Byte array is outside the 'for' loop, array[randomIndex] cannot be resolved.

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Null Pointer Access Variable Can Only Be Null At This Location

Apr 16, 2014

I'm getting an error on line 137 and all it is rsmd = rs.getMetaData();The error happens only after I press a JButton and it is

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerExceptionat softwareDesign.createAccount.actionPerformed(createAccount.java:137)

There is a lot more to it but that has nothing to do with my code it's just the stuff with Eclipse anyway I want to know how do I fix this problem?

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Why To Get Result Brand Null / Colour Null

Feb 28, 2015

public class Test {
public static void main(String[] args) {
Car c = new Car();
c.setInf("toyota", "red");
System.out.println("name: "+ c.brand + " colour: " + c.colour);

[code]....

Why do I get the result brand null, colour null? I know what null means but what am I missing here?

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Compare Int With Array Of Values

Dec 24, 2014

I need to compare an int with an array of values generated with a for loop previously. I have something like that for the search..

for( int i = 0; i < 5; i++){
System.out.print("Indovina.. inserisci un valore: ");
// I memorize the value taken input
n = sc.nextInt();

[Code] ....

Also, I need to print the array each time I insert a value that is in the array. But, hiding the values still not "guessed".

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Isolate Values From Array?

Feb 14, 2015

I'm trying to isolate specific values produced from that array at random. For example, if I were to have an array whose starting inputs are 5 & 10, the output is 5, 10, 15, 25, 40, 65 (the array stops before exceeding 100). Following this, I would generate 6 random numbers from this array (if the array is longer or shorter an equal number of random values from those arrays are generated) allowing for possible repetition of numbers.

So far, I have imported the Random utility and placed the following code below yesterdays code:

System.out.println();
for(int i = 0; i < limit; i++) {
if (array[i] < 100) {
System.out.println();
System.out.println("Rand. no. from array");
Random dice = new Random();
System.out.print(dice.nextInt(array[i])); //Call the Fibonacci array & generate rando numbers from it!!
}
}

Using the above (5, 10) array as an example, the output seems to generate 6 results for each position, but the random element is localised to each number, rather than the whole array. So, at position one we have number 5 and 'any' number between 1 & 5 is generated, rather than any 'specific' number from the 'whole' array. At the second position we have 10 and the printout will give the 2nd random number as anything between 1 & 10, and so on for the rest of the array. Ideally, I'd be looking for something like: 5, 40, 5, 65, 40, 15.

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Jul 5, 2014

I'm attempting to increment the values by 1 in an array of objects but I'm not able to increment with the increment operator.

for(int i=1;i<a.length;i++){
a[i].getHour(); hour = hour++;
a[i].getMin(); miinute = minute++;
a[i].getSec(); sec = sec++;
}

It just loops the value of hour without incrementing.

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Sep 29, 2014

I have this class:

package model;
import java.awt.Color;
import shapes.Oval;
import shapes.Rectangle;
import shapes.Shape;
import java.awt.Container;
import java.lang.reflect.Array;

[Code] .....

And as it is now, the values are not being passed into the shapeArray array. If I "hard code" two shapes into the array in this class, everything works fine later on, but I do not manage to pass values into the array from the createShape() method. I tried several approaches, nothing works.

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Values In Array Not Stored?

Oct 6, 2014

I just forgot to increment n while trying to store the humidity... I do this every time and I suddenly realize what I did wrong ...

My problem is that after printing humidity[n] in the "Humidity(%)" row, it seems that humidity[n] becomes 0. I checked like this:

System.out.println(humidity[5] + " " + humidity[6]);

In the "Humidity(%)" row, they come out fine, but when I do this, they come out as 0, which I think would explain why my heat indices are consistently lower than the temperature when the temperature is over 80.

My code:

import java.util.Scanner;
import java.io.File;
import java.io.IOException;
public class HeatIndex {
public static void main(String[] args) throws IOException {
System.out.printf("%70s", "Heat Index: Key West, Florida");

[Code] ......

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