How To Use Initialized Applet Class
Apr 3, 2014How to use initialized applet class?
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Swing/AWT/SWT :: Traffic Simulation - Applet Not Initialized Error
Mar 25, 2006I have a traffic simulation code that is producing a start:applet not initialized error each time i run it. This is the code
import java.io.InputStream;
import java.net.URL;
import java.util.*;
import java.awt.*;
import java.applet.Applet;
import java.lang.Thread;
class Node {
[Code] ....
When A Class Or Interface Will Be Initialized
Sep 18, 2014class Super { static String ID = "QBANK"; }
class Sub extends Super{
static { System.out.print("In Sub"); }
} public class Test{
public static void main(String[] args){
System.out.println(Sub.ID);
}
}
According to me output should be "QBANK" In Sub...BECAUSE sub default constructor will call super() constructor.. below is the definition in jls which i am unable to understand ....
A class or interface type T will be initialized at its first active use, which occurs if:
T is a class and a method actually declared in T (rather than inherited from a superclass) is invoked.
T is a class and a constructor for class T is invoked, or T1 is an array with element type T, and an array of type T1 is created.
A non-constant field declared in T (rather than inherited from a superclass or superinterface) is used or assigned. A constant field is one that is (explicitly or implicitly) both final and static, and that is initialized with the value of a compile-time constant expression . Java specifies that a reference to a constant field must be resolved at compile time to a copy of the compile-time constant value, so uses of such a field are never active uses.
All other uses of a type are passive. A reference to a field is an active use of only the class or interface that actually declares it, even though it might be referred to through the name of a subclass, a subinterface, or a class that implements an interface.
Servlets :: Unable To Run Listener Class Also ContextListener Is Initialized
Mar 8, 2014again i am facing problem i am able to run Listener class also the ContextListener is initialised but it is giving me error on Tomcat 6.0 command prompt
Here is my Listener Class Sample.java i am able to compile the code but it is giving java.lang.nullpointer exception at runtime on Tomcat.exe Is there is problem in my code
package servlet;
import java.io.*;
import java.io.FileInputStream;
import javax.mail.*;
import javax.mail.internet.*;
import javax.activation.*;
import javax.mail.internet.MimeMessage.*;
import javax.mail.internet.InternetAddress.*;
import java.util.*;
[Code]...
Java Applet - Sharing Variables With Another Class
Mar 29, 2015I have An Issue With My Java Applet. Im Trying To Share My Variables With Another Class, But Its Not Working.
Class 1
package com.Tobysmith10.game.main;
import java.applet.Applet;
import java.awt.Graphics;
public class Game extends Applet{
public void init(){
setSize(850,480);
public void paint(Graphics g){
g.fillOval(x,y,20,20);
}
}
Class 2
package com.Tobysmith10.game.main;
import java.applet.Applet;
public class gameLoop extends Applet implements Runnable{
public int x, y;
public void run(){
while(true){
x = 100;
y = 100;
}
}
}
So im sharing the x and y variables with the Class 1 , but I get yellow lines under it and when i run the program, it crashes, how do I get class 1 to recognize the variables from class 2 ?
Use Tag Object Or Applet For Entering Class Name Data
Sep 30, 2014I have problem with this applet. the browser gives page.I don't know wether its not loading or if its extremely slow.Also I am confused on the html part.Should I use tag object or applet and for entering class name data,classid or name.
import java.lang.reflect.InvocationTargetException;
public class NewJApplet extends javax.swing.JApplet {
@Override
public void init() {
this.add(fesText);
this.add(jButton1);
this.add(jLabel1);
this.add(jLabel2);
this.add(jPanel1);
[code]....
Use Applet To Create Two Instances Of Employee Class
Jan 9, 2014What I have to do: Use Applet to create two instances of the Employee class. Display the data on the Graphics object. Display in the applet the names and values of all of the instance variables in each instance of the class. Also display the value of any static variables.
What I'm doing:
import java.applet.Applet;
import java.awt.*;
public class EmployeeApplet extends Applet {
public static int topSalary = 195000;
int hoursPerWeek;
public static void setTopSalary (int s) {
if (s > topSalary)
[Code]...
I'm not able to display hours per week for e1 and e2.
Calling Applet From Another Class Main Menu
Aug 20, 2014I have a frame which I want to load an applet inside it. Here is the code i have in my main method:
MyApplet myApplet = new MyApplet();
myApplet.init();
myApplet.start();
javax.swing.JFrame window = new javax.swing.JFrame("myApplet");
window.setContentPane(myApplet);
window.setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE);
window.pack();
window.setVisible(true);
But I get an exception:
Quote
Exception in thread "main" java.lang.NullPointerException
at java.applet.Applet.getCodeBase(Applet.java:169)
at MyApplet.init(MyApplet.java:78)
at Intro.main(Intro.java:68)
Java Result: 1
Java Applet With Third Party Jar Not Working - No Class Found Exception
Aug 31, 2014I have written a java applet. Few months before It was working all fine but my client has some other requirements now and I have to edit it. I am getting two problems:
1. I could not execute it on my local computer as it always gives "your security settings have blocked a local application from running". I have edited the settings from Control Panel but it is then started giving permission error on including permission in manifest file it started giving trusted library error and still it is not resolved.
2. Can I know how to work with third party library with applets. I have imported the library and uses its few classes but when I tried to load applet it always give no class definition found error. I have some ways mentioned online like use comma separated names for all the jars but no luck so far.
Variables Not Have Been Initialized
Sep 23, 2014I continuously get an error for lines 34, 36, and 37 saying that the variables may not have been initialized.
import java.util.Scanner;
import java.util.Random;
public class MathTutor {
public static void main(String[] args) {
Random r = new Random ();
Scanner input = new Scanner (System.in);
/*int min=1;
int max=10;*/
int num1,num2,operation;
int n1= r.nextInt((9+1)+1);
int n2= r.nextInt((9+1)+1);
operation= r.nextInt(3);
int correctAnswer;
int userAnswer;
[code]....
Local Variable Not Initialized
Jun 19, 2014I am reading input from a file that has following information:
line 1 = numbers of integers in array,
line 2 = elements in array1,
line 3 = elements in array2.
These lines constitute a test case. There are 1000 test cases in the input file.
So basically, I read the length of arrays, populate the arrays by reading from the file.
The code is below ( I have not included reading input code):
while(test_case<1000){
if (count == 1){ //count keeps track of lines in input file
vec_length = Integer.parseInt (tokenizer.nextToken());
count++;
continue;
}
if (count == 2){ //populates array1
vector1 = new int[vec_length];
for (int i = 0; i < vector1.length; i++)
vector1[i] = Integer.parseInt (tokenizer.nextToken());
count++;
continue;
}
Array2 is populated using the same as above code. However when I use the following code:
for (int i=0; i<vec_length; i++)
temp += vector1[i]*vector2[i];
I get " local variable vector1 and vector2 have not been initialized error". But both arrays have been initialized in the if{} block. Is it because initialization was local to if block?
Getting Error - Variable May Not Have Been Initialized
Feb 21, 2015I know what the error means but I don't think initializing the variable will make my code work as intended so I'm having a little dilemna here... here's the code and I'll highlight the part that is said to be not initialized:
Java Code:
import java.util.Scanner;
public class ItemCost {
public static void main (String []args){
int i=1,item=1,e=1, f=1, g=1;
int items, d ;
double gst, qst, subt, Tot = 1, PriceItems ;
[Code] ....
So I'm supposed to get the following output :
Java Code:
Please input the amount of items bought 2
Please input the price of the item 1 1
Please input the price of the item 2 2
Please input the rate of GST in % 20
Please input the rate of QST in % 18 mh_sh_highlight_all('java');
HOWEVER my program doesn't seem to add input of item 1, and 2 if I initialize subt= 0 initially. It'll only take the last value inputted in the loop. By the way, the increments are counters to count the amount of errors the user might input by accident ( or whatever). Some people have been pointing it out as useless but that's the only way I found it to work.
Is Calendar Mutable - What The Value Was Initialized With
Jun 9, 2014I have a field that initializes a Calendar object:
Java Code:
private Calendar zeroPointTime = zeroPointTime();
private Calendar zeroPointTime(){
int year = 2000;
int month = 0;
int date = 1;
int hourOfDay = 0;
int minute = 0;
Calendar calendarTime = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
calendarTime.set(year, month, date, hourOfDay, minute);
[Code] ....
But other times I need to reference what the value was initialized with, not offset values added to it with various function calls.
When I use add() will that modify zeroPointTime? If so, how can I add seconds to a Calendar object without altering its value?
Printing Default Value Of Int - When Is Variable Initialized
Nov 12, 2014In 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
Inappropriate Error - Variable Arg Might Not Have Been Initialized
Mar 31, 2014Consider the following simple code:
public class Test {
private final int arg;
private final Runnable runnable1 = new Runnable() {
@Override
public void run() {
// No errors here, exactly as expected
System.out.println("ARG: " + arg);
[Code] ....
The java compiler (version 1.8.0-b132) produces the following error when compiling this code:
"Error:(14, 46) java: variable arg might not have been initialized"
Actually, I do not expect the error here.
Both declarations 'runnable1' and 'runnable2' are essentially the same: these are just Runnable objects accessing value of the 'arg' field (which is initialized in the constructor).
The only difference between the declarations is that 'runnable1' - is an old-fashion instantiation of Runnable, whereas 'runnable2' - is an instantiation of Runnable via a lambda expression.
Array - The Local Variable Average May Not Have Been Initialized
May 13, 2014public class Apples{
public static void main (String args[]){
int array[]={21,16,86,21,3};
int sum=0;
int average;
[Code] .....
Eclipse: Exception in thread "main" java.lang.Error: Unresolved compilation problem:
The local variable average may not have been initialized
at Apples.main(Apples.java:11)
Null Pointer Exception On Initialized Variables?
Oct 10, 2014Take a look at this screenshot... my java integrated devlopment envirnment is telling me I have a null pointer on a line with three variables ALL which were initialized.
I thought a null pointer was called when a variable doesn't get initialized.
Edit: Here is the java file and resources being used: [URL]
Create Mathematical Vector Of D Dimension Initialized At 0
Nov 14, 2014class GVector {
// TODO: declare a private array to save the vector coordinates
// Creates a mathematical vector of d dimensions, initialized at 0
public GVector(int d) {
// TODO: implementation
[Code] ....
I'm confused with what type of array I need to use to save the vector coordinates and what to put in Gvector. Is it a constructor?
Catch Block Error Variable Might Not Have Been Initialized
Feb 28, 2015I want to use a try catch block, but I am not sure how to fix this problem:
int a;
try{
a = Integer.parseInt(A.getText());
}
catch (Exception e){
Output1.setText("Error");
}
//do someting with a here
The purpose of the try-catch is to catch blank input.The problem with this is that underneath the try - catch I get an error saying that the variable might not have been initialized. I know why this happens. I know I could initialize the varaible before the try - catch, but there is no default or null I can set an int as. If I initialized it as 0, the blank input will no longer be catched.how to make this problem disappear?
Morse Code Conversion - Variable Has Not Been Initialized
Aug 26, 2014I'm making a program that can read an input of English or Morse code and return an output of Morse code or English back. The English-->Morse works fine, but not Morse-->English. I'm pretty sure my solution lies in displaying the variable 'morseWord', but no matter where I put it, I always get an error saying the variable has not been initialized. Here's what it looks like now:
import java.util.Scanner;
public class pro1
{
static final String[] alpha = {"a", "b", "c", "d", "e", "f", "g", "h", "i",
"j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u",
"v", "w", "x", "y", "z", " "};
static final String[] morse = {".-", "-...", "-.-/>/>.", "-..", ".", "..-.", "--.", "....", "..",
".---", "-.-/>/>", ".-..", "--", "-.", "---", ".--.", "--.-/>/>", ".-.", "...", "-", "..-",
"...-" ,".--" ,"-..-", "-.-/>/>-", "--..", " | "};
[Code] .....
Make A Java Program That Calls Object Value Initialized
Feb 23, 2014i have this following codes and im trying to make a java program that calls an object value initialized.
public class TestClass
{
public String name;
public int age;
public void myMessage()
{
System.out.println("Hello I'm" + name + "and i'm" + age + "years old");
}
}
what i want is to put the following codes of the object.. so once i compile and run the project it executes the value of an object from the method i defined above.
TestClass myName = new TestClass();
myName.name = "Jefferson";
myName.age = 18;
my question is, it is possible to declare or define it in the same project? or i need to do this separately?
Why Global Var Initialized With Static Method And Not By Other Static Global Var Declared After Its Usage
Jul 27, 2013Take this:
class test
{
static int i=j;
static int j=10;
.....
this will give illegal forward reference ....
but this will compile successfully ..
class test
{
static int i=test1();
static test1()
{
return 20;
}
}
.....
plz assume we have main method in both cases ..
java would be loading all static members first and would be assigning default values .. and then will be running all the initializers from to bottom ..Why second case is a compile success and not first .. as in second also test1 method is declared after its usage ..
How To Add Applet To The Frame
Aug 13, 2014i have created a frame with a menu bar displaying contents..now i want to set a username and password to that flame through an applet how to add applet to the frame??
here is my code ..
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
class MenuFrame extends Frame{
String msg="";
int flag=0;
CheckboxMenuItem debug,test;
[Code]...
Don't Need Main In Applet?
Apr 3, 2014Why we do not need main in applet .....
View Replies View RelatedEmbedded Applet On JSP
Aug 4, 2014I am facing problem when displaying my applet on jsp. I have convert my applet project into CustomColor.jar. my package is dcs.raj.MyApp
I have import my jar into project property. But still it is showing error on all browser, i have changed the java control panel > Advanced > Java Consol > Show console.
But still I am facing the same problem.
My Jsp code is
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<APPLET CODE="dcs/raj/MyApp.class" archive="CustomColor.jar" WIDTH=400 HEIGHT=400>
</APPLET>
</body>
</html> mh_sh_highlight_all('java');
Declaring Methods For A Class In Its Own Class Whilst Objects Of Class Declared Elsewhere?
Mar 5, 2015How do you declare methods for a class within the class whilst objects of the class are declared else where?
Say for instance, I have a main class Wall, and another class called Clock, and because they are both GUI based, I want to put a Clock on the Wall, so I have declared an instance object of Clock in the Wall class (Wall extends JFrame, and Clock extends JPanel).
I now want to have methods such as setClock, resetClock in the Clock class, but im having trouble in being able to refer to the Clock object thats been declared in the Wall class.
Is this possible? Or am I trying to do something thats not possible? Or maybe I've missed something really obvious?