Swing/AWT/SWT :: Traffic Simulation - Applet Not Initialized Error

Mar 25, 2006

I 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] ....

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I'm a student designing and developing an Air Traffic Control (ATC) system for incoming aircraft, mainly implementing the part which handles the queuing system for approaching aircraft.

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I am writing a simple program to simulate a traffic light. What I want is to make them glow after each 1 second, one by one. For example: Firstly Red, then after 10 seconds, red will be put to off and yellow will start glowing and then accordingly green. This process shall continue incessantly (Just for experimental purpose). I have some arrangement done but could not figure out how to put them together in run() method of Runnable interface. I know how interthread communication works. But could not find any logic in this case when three threads will run together.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TrafficLight extends JFrame implements Runnable
{
JButton red, green, yellow ;
TrafficLight()

[Code] .....

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Feb 21, 2015

I 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.

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Consider 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.

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First I have a JAVA stand alone GUI program that runs the program as follows:

g11_bttn_start_script_capture.addSelectionListener(new SelectionAdapter() {
@Override
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URI uri = null;
URL url = null;
String tempstr = "";
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[Code] ....

Basically it launches the executable t3drive, hangs arounf so it gets a chance to start, and then connect to it via the embedded browser.

It frequently works, sometimes launches in the browser but then freezes, and sometimes fails to start at all.

t3drive works 100% of the time if I run it under cygwin and I can reliably connect to it using any browser.

Why this might not be stable? Just looking for a direction of what to try next.

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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?

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I'm using jdk7 and I get this error when I compile Exception in thread "main" java.lang.Error: Unresolved compilation problem: at First.main(First.java:16)

Java Code:

import javax.io.*;
import javax.awt.*;
import javax.lang.*;
import javax.applet.*;
import javax.net.*;
import javax.util.*;
import javax.swing.JApplet;
import javax.swing.JFrame;

public class First extends JApplet {

public void init() {
getContentPane().add(new JLabel("Applet!"));

[code]....

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Java Code:

import java.applet.*;
import java.awt.*;
public class DemoColor extends Applet
{
Font littleFont = new Font("Helvetica", Font.ITALIC, 6);
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[Code] ....

Error Message:

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at java.awt.Color.testColorValueRange(Color.java:310)
at java.awt.Color.<init>(Color.java:395)
at java.awt.Color.<init>(Color.java:369)
at DemoColor.paint(DemoColor.java:24)

[Code] ....

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[Code]...

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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;
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[code]....

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package jslx.forecasting.demandgeneration;
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[Code] ....

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I was thinking to make a game where two cars are going to race against each other. I already have two gif pictures which are the cars. I do now have a background and a racer track. So we can start from here.

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package p2;
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private Object window;
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[Code] .....

But the problem is now that im kinda lost and I dont really know what to write anymore. How can I get a for example a green background on the whole PaintWindow with two Racers tracks and inside the racers tracks (Each car have each track) does it have to be cars. So I need to somehow import the cars inside it too. But thats the problem I need. that I dont really know what more to do. To make it easier, I have a Main-method in another class.

public static void main(String[] args) {
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BTW

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Jun 19, 2014

I 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());
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continue;
}
if (count == 2){ //populates array1
vector1 = new int[vec_length];
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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++)
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class 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.

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