Want To Know Size Of Object In Java
Mar 11, 2015class Father
{
public int a=5;
private int b=10;
[code]...
what is the size of obj from above code?
ADVERTISEMENT
How To Set Size For Panel With Graphics2D Object
Oct 1, 2014I am writing a program to solve Sudoku puzzles. I create the user interface using AWT/Swing.One panel of the main window (JFrame object) contains a Graphics2D component only (a grid for the sudoku puzzle). The problem is that this panel is too small for its contents when it is created. I have tried many things to make it bigger (like the setSize method of the panel), but to no avail. Who can tell me how I can make the panel with a single Graphics2D object larger?
Below is the code for the main window, which is a JFrame object. I set its size to 400 x 400 to have ample room for all panels. I then create two panels: a sudoku panel that contains the sudoku grid and a button panel that contains two buttons. The button panel has a flow layout.
I then create the main panel. This has a vertical BoxLayout. Finally I add the sudoku panel and the button panel to the main panel and the main panel to the frame.
public class ViewController_Graphics extends JFrame {
JButton solveButton = new JButton("Solve");
JButton nakedSinglesButton = new JButton("Naked Singles");
public ViewController_Graphics(SudokuModel model) {
super("Sudoku");
setSize(400,400);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLookAndFeel();
// create sudoku panel
[code]....
When I run the program, the following Window shows up:the button panel is exactly in the middle (and it remains in the middle, no matter how I resize the window). And there is not enough room for the sudoku panel. How can I make enough room for the sudoku panel when the window is created?
Increasing Java Heap Size
Nov 21, 2013I am using a 64 bit Win 7 Pc with 64-bit JVM and we get the error: Java heap space. So we want to increase the Java heap size but not for one application but for every application or in general.
We tried with the java -xmx command but it didn't work...
We tried setting the system variable JAVA_OPTS but again it didn't work...
Size Of Java Boolean Type In Memory
Jun 13, 2013I searched everywhere but i didn't found anything about the real size of primitive boolean type used by java.
View Replies View RelatedWhy Cannot Change Size Of TextField In Java For Calculator Application
Jan 13, 2014package name;swing library found in javax called to use the graphical contents.
import javax.swing.*;
//creating the contents for the calculator
public class calc {
JButton btn1= new JButton("1 ");
JButton btn2= new JButton("2");
JButton btn3= new JButton("3");
[code]....
I have tried different sizes for the 'TextField' but when I change the size, the position changes instead of the size itself.
JRE :: Reduce Java Runtime Size When Bundled With Application
Mar 31, 2015We are shipping in our company the JRE bundled with the client application in order to ensure the compatibility. But when upgrading from jre6 to jre8 the size increased by 50 MB!
Is there a reliable and secure way to reduce the footprint of the JRE? Are there "light distributions" or a list of libs/files that can be safely removed?
Java Code - Changing Text Size In Windows Settings
Apr 14, 2014I have a major problem. the text size is like 6 or 8 pt font and I can't read it. I'm trying to run a downloaded exe program which uses the jre7 which I had to download beforehand. the font size stays at 6 or 8 even if I try to change it in windows settings. it's a high res monitor on a lenovo yoga laptop. is there a way for me to edit the java code and manually change the font size?
View Replies View RelatedPrint Custom Invoice Of Page Size Using Jasper Report Or IText For Java
Jul 4, 2014I want to print data on invoice receipt size of 20.5 x 14 cm(hard copy). In which I try to put text at some absolute location. I tried iText first. In that I try to set page size by following code. here what is unite used in bracket of rectangle?
Document document = new Document(new Rectangle(552,377));
PdfWriter.getInstance(document, new FileOutputStream("report.pdf"));
document.open();
...
...
...
document.close();
Second I tried Jasper report. In that I set page size to 20.5 x 14 cm. But how can I take value from my java application's textfield and put it in to some absolute location in iReport.As I know jasper report take value from database but how can I take value from java application's textfiled?
I am more familiar with iText. How can I print custom invoice using iText or Jasper Report.I am developing java application using netbeans.
Java Array Update Without Using ArrayList - Add Values And Update Size?
Feb 9, 2015I 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]...
Equals Method - Take Object Reference And Return True If Given Object Equals This Object
Mar 28, 2014Create an equals method that takes an object reference and returns true if the given object equals this object.
Hint: You'll need 'instanceof' and cast to a (Geocache)
So far I have:
public boolean equals(Object O){
if(O instanceof Geocache){
Geocache j=(Geocache) O;
if (this.equals(j)) //I know this is wrong... but I can't figure it out
return true;
}
else return false;
}
I think I have it correct up to the casting but I don't understand what I'm suppose to do with the this.equals(). Also I'm getting an error that I'm not returning a boolean... I get this all the time in other problems. I don't get why since I have to instances of returning booleans in this. "returns true if the given object equals this object" makes no sense to me. I assume the given object, in my case, is 'O'. What is 'this' object referring to?
Moving Object In Java?
Feb 21, 2014Basically I have a program that paints a simple object image. There are 5 of these objects altogether and different classes and methods have been set up to do this and this works correctly. The program currently also asks the user if they would like to change the colour of this object shape, and which shape they would like to change (user inputs a number 1-5) then the program will change the colour of this shape.
But the new task is for the user to input a number (1-5) to which shape they would like to MOVE position of. Hhow this would be done? Would there need to be different methods for changePositionX, changePositionY? The user needs to input the X and Y co ordinates and then this will move the selected shape to its NEW position in the current JFRAME.
Java - Cannot Deserialize Object
Feb 12, 2015I can't deserialize my object, program is exited with crash.
See attached file.
How Many Ways To Create Object In Java
Mar 21, 2014How many ways to create an object in java ?
View Replies View RelatedJSP :: Transferring Object To Java Class
Mar 28, 2014I have a servlet that generate a list of objects named "Alerte". I display this list in my jsp and I want the user to be able to delete one of them by clicking on it. Data are stored on Google Datastore. My problem is that I don't know how to pass the current object from the loop of my JSP page to my java class.
<%
List<Alerte> alertes = (List<Alerte>) request.getAttribute("alertes");
%>
<c:forEach var="alerte" items="${alertes}" >
<table>
<tr>
<td>Name:</td>
<td>${alerte.name}</td>
[Code] .....
Servlets :: Create Corresponding Java Object?
Sep 18, 2014I get an json from http request. I want to create a corresponding Java object.
is there any automated mapping? Something called pojo or something else?
Java Object Stored In Array?
Apr 8, 2014I have been having trouble with a recent hw assignment requiring us to sort user defined data types in an array. so far, i have implemented the sorting algorithms correctly but i cant seem to store a string and an integer together. I have an employee class
[public class employee {
private String Name;
private int IdNumber;
public employee(int IdNumber,String Name){
this.Name=Name;
this.IdNumber=IdNumber;}
[Code] .....
And in my app, i create a employee object-----> employee john=new employee(1020, "John");
How can I prompt my insert method to take in employee id and string name together?
Create A Balloon Object In Java
Sep 19, 2014Programming Assignment #2
(Using an Existing Class: Creating Objects and Calling Accessor and Mutator Methods)
I. The Assignment
This assignment is to write a "test" class (aka: a "driver" class or "client code") that uses the class Balloon.java, available on the class web page.
To use the Balloon class, download it and store it in the src folder of your NetBeans project. Make sure you save it as Balloon.java.
The best way to learn how to use the Balloon class or any other Java class, for that matter - is to consult the documentation, Balloon.html (online). You can also read the javadoc comments that appear just above the class declaration and above each method declaration, which explain what each method does, what the method's parameters are, and what value if any - is returned by the method. The html support pages are generated from these comments.
-Review declaring variables, creating objects, calling methods that return a value vs. void methods, and accessor and mutator methods before beginning. To receive credit for this assignment, you must not modify the Balloon class in any way!
II. Your BalloonTester Class
Your BalloonTester class will have only a single method "main" and will perform each of the following operations, in the exact order listed below. Each operation may be done in one or two statements. Make sure you follow directions faithfully, and note that once you have done step 3, you can copy and paste it to do steps 6, 9, and 12.
1.Create a Balloon object with a name of your own choosing and an altitude of 100 meters.
2.Create a second Balloon object with a name of your own choosing, and specify an initial altitude of -100 meters.
3.Call the accessor methods of the Balloon class to get the name and altitude of each Balloon object. Print the data, one object per line.
4.Make the object you created in step 1 ascend to an altitude of 250 meters.
5.Call the adjustAltitude method to increase the altitude of the object you created in step 2 by 150 meters.
6.Call the accessor methods of the Balloon class to get the name and altitude of each object. Print the data, one object per line.
7.Call the adjustAltitude method to decrease the altitude of the object you created in step 1 by 150 meters.
8.Make the object you created in step 2 descend to the same altitude as the other object. You may assume that the other object is at a lower altitude.
To get credit for step 8., the statement(s) you write must always work, regardless of the actual altitude of the second object. It cannot depend on you knowing the altitude of the second object, but must utilize the fact that the object knows its own altitude. In other words, if you use a literal in any way to set the altitude, it is not correct.
9.Call the accessor methods to get the name and altitude of each object. Print the data, one object per line.
10.Move the object you created in step 1 to an altitude that is four times its current altitude. As in step 8, the statement(s) you write must work for any altitude and may not depend on you figuring out the new altitude beforehand.
11.Attempt to move the object you created in step 2 to an altitude that is 150 meters below its current altitude.
12.Call the accessor methods to get the name and altitude of each object. Print the data, one object per line.
and this is the Balloon.java given:
// File: Balloon2.java
// Modified Balloon class has overloaded constructors
/**
* A class to represent a hot-air balloon. Balloon objects have a name and an altitude.
*/
public class Balloon2
{
// instance variables
private String name ; // name of the balloon
private int altitude; // altitude (height) of balloon in meters
[Code] ....
Convert Java Object Using JAXB To XML
Nov 7, 2014I am suppose to have a method called save() which should marshall the list of computer parts in the right panel to an XML file. In reverse, another method called load() that should unmarshall the saved XML file back into an object. So basically, the Save event will call save() method and save the list of parts in the right panel to an XML file. The Load event should clear the right panel, and call load() method. When load() is called, it should display the unmarshalled data in the right panel. I got "Exit" to work.
I'm having hard time figuring out the "Load" and "Save" parts though.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class PCParts implements ActionListener{
[code]...
How To Prevent Java From Creating Object
Mar 6, 2014I just want to ask about a kind inheritance.Let say I have an interface MachineCode.I also have different classes, Binary, Hex and Octal that implements MachineCode
Question: How can I prevent java to create an Object like this:
Binary bin = new Binary();
Hex hex = new Hex();
Octal octal = new Octal();
those declaration above must be compile error,
I want to create Objects of Binary, Hex, and Octal this way:
MachineCode bin = new Binary();
MachineCode hex = new Hex();
MachineCode octal = new Octal();
Object Level Locking In Java Threads
Apr 16, 2014I know that below code would put a lock on current instance of DemoClass, What I am not sure of is the role of lock on Object Class in second example. How does below works - Is it putting a lock on Object Class? If yes how will putting a lock on Object? I mean, locking DemoClass ensure no two threads access it concurrently, how does this apply to Object class?
private final Object lock = new Object();
synchronized (lock)
public class DemoClass
{
public void demoMethod(){
synchronized (this)
[code]....
Java Object Declaration Beyond Common Idiom
Feb 5, 2015when a new object is created in Java it follows the idiom:
Object obj = new Object();
where the Object() constructor matches the object type Object.
But what if it doesn't? I understand from the Oracle Docs on creating objects and polymorphism that the constructor must be in that object's class or one of its subclasses. However, suppose we wanted to declare a new stack. My first instinct would be:
Stack s1 = new Stack();
But I assume it's valid to do it this way, too:
Object s2 = new Stack(); // Is there a difference here? What are we really saying about s2? I'm guessing s2 is simply an empty stack, but only has access to the Object class methods? I'm not sure why someone would ever do this, but I want to solidify my understanding of the Java hierarchy. Are there really any circumstances where someone would use a subclass's constructor when creating a new object?
Does Java Have A Nice DatePicker Object Similar To C#
Feb 16, 2014I've looked around a bit myself online (admittedly for only a few minutes) and have yet to come across a straight-forward object for date selection. Does Java offer something like that?what should be a simple task?
View Replies View RelatedSerializing And Deserializing Multiple Object In Java
Dec 10, 2014My application needs to accept multiple input at different time and i need to serialize it whenever it gets the new input and after that i need to Deserialize the object one by one.how it can be implemented. Eachtime i am able to deserialize only one object that came at last. How to implement this functionality..
This is the code for serializing.
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Scanner;
public class Dummyserial implements Serializable {
[Code] ....
Java Code Can Get At The Address Of Some Object Or Other Datum
Mar 17, 2015I wanted to ask is there any way that Java code can get at the address of some object or other datum? I've found this useful a few time with certain high performance C# libraries that I've developed.
Also does Java have the equivalent of C#'s "fixed" buffers? which are inline contiguous arrays of primitives (like Chars or Ints etc).
Deleting Complex Object In Java List
Sep 3, 2014I am following those three tutorials and I have completed it with success.
( [URL] .... )
( [URL] .... )
( [URL] .... )
But then, as author haven't implemented removeCountries method I tried to create it. What I did initially was to just add to class Countries this method:
public boolean removeCountry(Country country) {
return countries.remove(country);
}
But although compiler wasn't complaining it didn't work. Actually it worked last night (before reboot) but not today. Must be some SOAP iterator/binding thing or whatever. Or I thought that it worked but in fact it didn't.
Here are original classes:
//-------------------------------
public class Country {
String CountryId;
String CountryName;
public Country() {
super();
[Code] ....
I would like to avoid my own iterator as JDeveloper can generate automatically iterators for webservices, but if I can't get it that way, what would be better way to write above mentioned iterator in removeCountry method?
Is there any way to remove object directly with something like this:
co.countries.remove(o);
co.removeCountry(country)
using method
// This left unused
public boolean removeCountry(Country country) {
return countries.remove(country);
}
from class Countries?
Parameters should be set by web service iterator.
Java - Allocate Whole Object To One Complex Number
Jul 6, 2014Java has not structures, I must allocate whole object to one complex number?
Java has complex numbers handling, classes for complex?