ArrayList - Default Size As 10

Oct 8, 2014

ArrayList l = new ArrayList();
System.out.println(l.size());

When I running the above code in eclipse the console show me the result as "0". So how to rectify this code to find default size as 10.

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JavaFX 2.0 :: HTMLEditor - Default Size / Cannot Fill Full Screen

May 10, 2015

The code:
 
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.BorderPane;

[Code] ....
 
run (when window height > 700px ) :
 
HTMLEditor  default height is 670px, the other area (green color) is not filled,why?
 
HTMLEditor   高度总是670px, 怎么把HTMLEditor 填充满窗口?
 
这是一个bug吗?

is it bug?

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Mar 23, 2015

I am facing difficulties in identifying the proper way to add the selected colors of cards into an arraylist. I am having an arraylist which is:

Java Code: private List<String> selectedCars = new ArrayList<String>(); mh_sh_highlight_all('java'); And one more for the carColors:

Java Code: private List<String> carColors = new ArrayList<String>(); mh_sh_highlight_all('java');

The selectedCards array will store the selected cars ['TOYOTA','MAZDA','NISSAN'] as per the selection from the user.For certain types, there is one default color which is 'Black', however for some of them, the user can select different colors.(ex. if selection is 'Toyota')
Java Code:

String carColor="";
String toyotaColor=""; // The value will be retrieved from the form once the user selected the color
if (selectedCars.contains("MAZDA"))
{
carColor="Black";
}
else if (selectedCars.contains("TOYOTA"))
{
carColor=toyotaColor;

[code]....

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Feb 9, 2015

I am trying to create an array list without using the built in arrayList class that java has. I need to start the array being empty with a length of 5. I then add objects to the array. I want to check if the array is full and if not add a value to the next empty space. Once the array is full I then need to create a second array that starts empty and with the length of the first array + 1.

The contents of the first array are then copied into the new array without using the built in copy classes java has and then the new array ends up containing 5 elements and one null space the first time round. The first array is then overwritten with the new array containing the 5 elements and the null space. The process then starts again adding values until the array is full which will be 1 more value then recreating the second array empty and the length of the first array + 1. This is my attempt at creating this but I have run into multiple problems where I get only the last value I added and the rest of the values are null:

public class MyArrayList {
public Object arrayList[];
public MyArrayList(Object[] arrayList) {
this.arrayList = arrayList;

[code]...

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Create Own ArrayList Using Collection Without Implementing ArrayList Itself

Feb 28, 2014

I'm trying to create my own arraylist using Collection. My program doesn't do anything. Obviously, I haven't a clue.

import java.util.Collection;
import java.util.Iterator;
public class MyArrayList<T> implements java.util.Collection<T> {
private int size = 4;
private T[] mArray;
public MyArrayList(String[] args) {

[Code] ....

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No Default Constructor

Nov 2, 2014

The LocalStudent class inherits the Student class. The IDE states an error of "no default constructor in Student class".I understand that if a LocalStudent object is created, the default constructor of its superclass (aka Student class) will be called implicitly.there is no LocalStudent object being created, so why is the default constructor of Student being called ?

The default constructor of LocalStudent is also overloaded by the created no-arg constructor containining subjects = null; . So there is no call to the superclass default constructor from the default constructor of LocalStudent.

public class Student {
private char year1;
public Student(String name, char year){
year1 = year;
}
public char getYear(){
return year1;

[code]...

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Difference Between Protected Or Default

Mar 28, 2015

I am new in java. Is there any difference between protected or default when we are talking about one package?

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How To Put Default Int / Float For JTextField

Feb 4, 2014

Will I'm tying in my code to set a default number for the JTextField that when the user decide not to put any numbers. Like let say that I want the textfield set to 0 , so then the user do not file it it won't make any problem to the program because its already has a default number.

if (stringGQ != null && stringGW != null && stringGP != null){
 stringGQ = gMQ.getText();
stringGW = gMW.getText();
stringGP = gMP.getText(); 
weightPrice_1M = Double.parseDouble(stringGW) * Double.parseDouble(stringGP);

[Code] .....

Note: This is a small part of my code. when I leave it empty it take the 0 as a value, However, when I write in text field it also take the value of a 0 and the finalTotal is also = to 0.what I'm doing wrong.

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Default Literal For Boolean

Mar 31, 2014

what is default literal for Boolean data type?

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Default Method In Interface

Feb 7, 2014

interface I1{
void show();
void display();
default void put(){
System.out.println("I am from interface I1");

[Code] ....

This code is not working..

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Default Access Modifier

Mar 21, 2014

class Course
{
String courseName;
}
class Entry
{
public static void main(String[] args)
{
Course c = new Course();
c.courseName="java";
System.out.println(c.courseName);
}
}

I have defined these two classes under same java project in Eclipse IDE with no package. Above two class are having default classes. class Course is also having a instance variable courseName with default access. So when we try to compile the Entry class it will give the errors while accessing the instance variable courseName on Line 6 and 7. As both the classes are having default access modifier. class Course is not visible to class Entry, then why we do not get any compilation error while creating the object of class Course on line 5?

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If Interface Can Be Default Then Why Not Protected?

Mar 9, 2014

I was just wondering.. my understanding from everywhere I have read is interface cannot be private or protected (not at the top level) but when we declare an interface without any modifier it is default.

We know default modifier has more restricted access than protected.. public > protected > default > private

Now since an interface can be public and default then why not protected as clearly if they were allowed to be protected they could be implemented by a subclass..?

While typing this question I figured how would an interface know which is it's subclass? that is why Java allows only public i.e. any class can implement it or default i.e. any class within the package can implement.. am I right?

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Initialization And Default Values

Mar 20, 2015

I have a question related to q44 of Examlab.

public static void main(String... args) {
String i;
// String i = null; that would compile
if (i == null) {// this line does not compile as i was not initialized
System.out.print("A");
} else {
System.out.print("B");
i = "A";
main("A", "B");
}
}

Why does the above code not compile although the statement String i should lead to an initialisation of i to the value of null which is the default value for Strings.

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Default Initialization To Appropriate Value By Compiler

Feb 20, 2014

I remember reading Instance variables & local variables (in methods) are initialized to appropriate value by the compiler.

Is this true for static class variables and variables in nested classes ?

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Jan 22, 2015

I want to programmatically change the default program which an extension is opened in. So .resantic extensions for example to run in my jar file when I double-click on it. I know i need a bat file or exe file because i can't directly run the jar file. But i was wondering if its possible to run it if its an executable jar file. Else i can just make a bat file that runs my program. Also how can i on double click send the path to the file that was clicked in the args[] array so i can open the actual file aswell instead of just opening the program?

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Printing Default Value Of Int - When Is Variable Initialized

Nov 12, 2014

In the following code the print method prints the default value of int(zero) for the first time even when the variable i has been assigned a value of 4. Why?

class A1{
A1()
{
System.out.println("Inside constructor of A1()");
print();
}
void print()
{
System.out.println("A");

[Code] ....

Output:
Inside constructor of A1()
0
Inside constructor of B1()
4

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Sep 13, 2014

I am writing a program that accepts input from the user, I want default values displayed before the input values.

Java Code:

public surfboards() {
surfboardType = "Type not assigned";
shaperName = "Shaper not assigned";
constructionType = "Construction Type not assigned";
surboardSize = 0D;
} mh_sh_highlight_all('java');

I can get the output to display as shown below

(THIS IS WHERE I WANT DEFAULT CONSTRUCTOR DISPLAYED. Currently not displayed)

Type not assigned
Shaper not assigned
Construction Type not assigned
0 Feet

(THIS IS WHERE I WANT DEFAULT CONSTRUCTOR DISPLAYED. Currently not displayed)

input:

Java Code:
Enter Surboard Type:
test
Enter Shaper Name:
test
Enter Surfboard Construction Medium:
test
Enter Surfboard Size:
6.5 mh_sh_highlight_all('java');

Output:
test
test
test
6.5 feet

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Aug 14, 2014

I want to use my implemented toolkit while loading applets. So, I have set the Runtime Parameters

-Dawt.toolkit=org.sug.MyToolkit in Java Control panel.

But when it is not picking MyToolkit, instead its default toolkit sun.awt.windows.WToolkit.

I am able to set it perfectly in Java 6 but it is not working in java 7.

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Apr 9, 2015

I just recently started learning about encapsulation, how to set variables private and only accessible to other classes through setters() and getters(). I've seen a couple of programming examples, perhaps not enough but some from here, and I sort of built the assumption that by default all variables need to be private. to make things more clear, here's a card dealer I made which simply

1- generates a fulll deck of 52 cards
2- lets user decide how many players, with 5 as Max number allowed as each player is dealt 10 cards.
3- deal cards

I approached this by making A deck , card , player and game class

import java.util.ArrayList;
public class Deck {
//an Object of this Class would generate a full deck ie an ArrayList of 52 Cards
private String[] suits={"Spades","Diamond","Clubs","Hearts"};
private int[] number={1,2,3,4,5,6,7,8,9,10,11,12,13};
ArrayList<Cards> deck= new ArrayList<Cards>();

[code]....

I can understand why for example Deck class's suit and number arrays are set to private , as they only need to be accessed by this class only. however, both the Deck class's deck arraylist and the Player class arraylist are not private, as I need to transfer these values from one to the other and it felt to me that setting them to private would make it more difficult to deal with them, but what I did instead is to set the Game class dealCard(), which is the only method that have access to them as private. does this achieve the same effect or do I need to set both of these arrayList to private?a follow up question, this is more related to the actual card dealer program, in this code

private void dealCards(){

for(int x = 0 ; x < playerCount ; x++){
for(int y = 0 ; y < 10; y++){
playerList.get(x).pile.add(deck.deck.get(0));
deck.deck.remove(0);
}
}
}

is there an API in ArrayList class that moves(adds to receiver and remove from giver) element across ArrayLists?

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Dec 9, 2014

I found different ways to code this for a button named "closeButton":

- closeButton.getRootPane().setDefaultButton(closeButton);

- thisDialog.getRootPane().setDefaultButton(closeButton);

- SwingUtilities.getRootPane(closeButton).setDefaultButton(closeButton);

Which is best?

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I deleted my default path value in system variables in the process of adding java location in that.. How can I get that default PATH value.. I am using windows 7 enterprise OS 32 bit in Dell laptop...

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Aug 4, 2014

I would like to change the default skin of JavaFXapplication during runtime. How I can do this using ComboBox? Now I use this code to change the value:
 
setUserAgentStylesheet(STYLESHEET_MODENA);
 
Is there a way to change the skin in a run time?
 
Ref Set default skin in JavaFX with ComboBox - Stack Overflow

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Dec 21, 2014

I have several Windows 7 Enterprise machines that have already been deployed via image and need to lower the security settings for use on internal web based applications.
 
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I have attempted to login as the machine administration, make the changes on the Java console with the hopes this configuration would have migrated to all user profiles that log into the PC. Is there a "public profile" configuration file I can change and if so, what should I do.

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Sep 26, 2013

Im running an eclipse application in my machine. I have two queries

1. I would like to know how to check the default heap size that the jvm is using to run the application.Im using a windows machine to run the java application. I tried to check the default heap size by the following way
ControlPanel--->Programs--->JavaSetting--> JavaTab -->View Button ---> JavaRuntimeEnvironment settings window ---> Userstab --> Value under RuntimeParameters

But in my system, there is no runtime parameters defined. Is there a command that I can execute via command prompt to check the default heap size in my machine.

2. How to increase the heap size parameter and run the eclipse plugin application from command prompt. For eg: To increase the heap size and execute the jar file we use the below command java -Xms64m -jar MyApp.jar. I would like to know how to set heap parameters and execute my java application which is an exe file. I tried to execute use the below command, but the command prompt doesnot recognise the command

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How do you test a default constructor in one class and then test it in a different class? This is the code for the Person class which has the default constructor. I'm not sure in the PersonTester class how to access this default constructor and how to test it - what I have so far for the second class is also below.

class Person {
// Data Members
private String name; // The name of this person
private int age; // The age of this person
private char gender; // The gender of this person

[code]...

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