Involving Action Listener And If Statements For Multiple Conditions

Jan 25, 2014

I'm writing a program for exemplary reasons that is basically two text fields, one for a username, and one for a password. the way its written is asking testing for what is inputed into the text fields if its equal to a "valid" username and password. if it is, a variable representing that is set equal to 1. there is another if statement asking if the actionevent.getsource is equal to the name of the textfield. the issue I had was that when I ran the program, it seemed to only test for the first condition, so I got the same result from the program regardless of what I input into the text field.

The Code

Main class:
import javax.swing.JFrame;
public class Alpha {
public static void main(String args[]){
log l = new log();
l.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
l.setSize(360, 240);
l.setVisible(true);

[Code] .....

The code originaly was written "eve.getSource() ==" but I changed that to see if it would resolve the issue with no avail. With it written this way, the program does nothing upon entering the text and pressing enter. Currently, there is nothing written to change the variable "val" to 1 to show that the username is valid. I did this because I can't figure out how I would go about doing this.

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Timer Action Listener

Oct 5, 2014

Whenever i click start button it will just printout start to the jtextfield it wont start the time .

import java.awt.*;
import java.util.Date;
import javax.swing.*; 
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.*;
 
[code]...

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Feb 22, 2014

I'm using Eclipse with the Window Builder Pro plugin to create a Java program. I noticed that when I had Eclipse create an action listener for a combobox in a Swing GUI it created an AWT listener.

Did I choose the wrong type of listener? I want my code to use the Swing components because I understand that they are more portable.

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Apr 22, 2014

In my code 0,1,2 work fine an present my prompts an use my listener correctly but for some reason 3-6 is not an I don't know why? Here's my attached code.

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class Guess extends JFrame

[Code] ....

I meant 3-5 not 6

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Jul 14, 2014

I have three JComboBoxes. When the user selects an entry in the first JComboBox the entries in the second are set. For this I use an Action extends AbstractAction which is bound to the first JComboBox.

I have also bound an Action to the second JComboBox.

Problem: this also fires when the entries on the second JCombox are added which leads to a Nullpointer.

I need a Listener which only reacts to user input, and does not react when the model of the JComboBox is changed.

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Mar 5, 2014

Which contains a tabbed pane and in the sub panel it has two sub panels

1. new user
2.list if i click a button in panel ---

one new user --- i need to get call a function which is of other class so that it displays the list in the right panel..

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class Test extends JFrame{

[code]...

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May 16, 2014

I'm not a java developer, i'm a tester. I am currently testing a java swing application and to do that I have to automate how its used. IE I have to write code which will press buttons for me rather than depending on an end user to do this. I have managed to reverse engineer the entire application (hooray for me), however I am struggling to work out how to invoke methods that would typically be kicked off by a user pressing a button. how to I can call actionPerformed(ActionEvent ae) method which sits in the ATMMainPanel class?

I will be calling it from inside another method which is the equivalent of the main() method.

Java Code:

public class ATMMainPanel extends JPanel implements ActionListener {
[declarations here]
//here - User is pressing the Enter button after putting in pin.
public void actionPerformed(ActionEvent ae) {
[code performed when button is pressed]
} mh_sh_highlight_all('java');

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Swing/AWT/SWT :: Action Listener Does Not Work With Button Click

Feb 22, 2015

I have buttons created on a frame and then I register the listener from a controller in a controller-view relationship.

When I click the button on the face, the action never executes for some reason. I thought maybe there was a problem registering the listener but I can call the buttons doclick() method and it executes as it should. Perhaps I'm overlooking something really obvious here but I can't see it.

btnEight = new JButton( "8" );
// btnEight.addActionListener( controller );
btnEight.setBounds( 212, 90, 41, 23 );
frame.getContentPane().add( btnEight );

and then I add the listener

public void setController( ActionListener theController ) {
Component[] components = frame.getContentPane().getComponents();
for ( Component component : components ) {
if ( component instanceof JButton ) {
JButton button = ( JButton ) component;
button.addActionListener( theController );
}
}

again, when i click the button nothing happens. but if i add the following code

btnEight.doclick()

the actionPerformed invokes in theController as I intended.

You can see the entire project on GitHub so you can see the full context. The controller class contains the listener and the view class contains the buttons.

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Dec 8, 2014

I am working on a 3D-Projekt, but that's not the point. I wanted to call a function to turn the camera and want, that the function ist called while the key is pressed. I tried following:

private ActionListener actionListener = new ActionListener() {
public void onAction(String name, boolean pressed, float tpf)
if (name.equals("Camera Left") && pressed) {
setViewAngle(-1);

I think, I have to change the ActionListener "onAction", but I can't remember in which way. In the actual code the programm only once perform the action when the key is pressed.

I already tried :

while(pressed) {setViewAngle(-1)}

But that didn't work, but get the whole programm to halt.

So I thought of key repeating.

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Mar 7, 2014

here is the code i already have made;

import java.awt.*;
import javax.swing.*;
public class EX_7_2 extends JFrame
{
public EX_7_2()
{
setLayout(new BorderLayout(5, 10));

[Code] ....

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IOexception Expected Error Action Listener Method

May 9, 2015

Need to write two files but getting an expected exception error.
 
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.Scanner;
import java.io.FileWriter;
public class TestingPanel extends JPanel

[Code] .... 
 
TestingPanel.java:49: error: unreported exception IOException; must be caught or declared to be thrown
FileWriter outputFileQuestions = new FileWriter("Test.txt");
^
TestingPanel.java:50: error: unreported exception IOException; must be caught or declared to be thrown
FileWriter outputFileAnswers = new FileWriter("Answers.txt");

[Code] ....

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Apr 22, 2015

What I am attempting to program is a simple Boss battle. I would like the user to have 2 options (for now): Run, or Attack. I got the portion completed and working, but once I tried to implement the Run feature (the way that it's supposed to work is you can either attack OR run), both Attack and Run will happen. Also, for some reason, the running always fails (it will always return the else statement, then move onto the attack.) Here's my code:

import java.util.*;
public class AdvancedBossBattle {
public static void main (String[] args) {
Scanner scan = new Scanner (System.in);
Random gen = new Random();
int bosshp, bossdmg, playerhp, playerdmg, runChance;
String answer;
bosshp = 100;

[Code] ....

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Oct 25, 2014

So im making a calculator just basic 4 function with a clear button. as i am working into this project i am running into an issue of assigning which click sets what. For instance i click the two button how do i tell it to assign it to firstNum, versus secondNum?

private class theHandler implements ActionListener{
public void actionPerformed(ActionEvent event){
if(event.getSource()==one){
firstNum=1;
}
if(event.getSource()==two){
secondNum =2;
}
if(event.getSource()==three){
secondNum =3;
}

So this for instance allows me to set one to the firstNum and then add it to two or three but im not sure what to do next. I have in my mind i want to do something like make three listener classes, that operate in sequential order like you pick the first numbers, click an operation, and then select the second numbers then hit the operation(equal) button to display answer. Am i on the right track or what?

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May 20, 2014

After this problem is fixed, my math game will run. The answer variable is supposed to be equal to the cases in the second switch statement by random but I get errors whenever I try to initialize it this way. I have been writing this program for almost 5 days now and it is finally wrapping up. Why I can't map the answer variable to the second switch statement the way I want to?

package pkgnew;
import java.util.Scanner;
import java.util.Random;
public class New {
  public static void main(String args[]) {
//Declare and construct variables
Random randomnum = new Random();
int fnum, snum, answer;

[Code] .....

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Sep 25, 2014

Ok, so I've seen alot of things online about writing switch code, but I can't find any involving user input, let alone multiple input scanners.

The goal is I let the user put in two different integers and it will decide based on both of the integers which of the 15 possible results it will display.

I am also not allowed to use if/else statements in this program.

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Jan 30, 2015

I have the following listener on a tableset of names:

ListSelectionListener singleListener=new ListSelectionListener() {
public void valueChanged(ListSelectionEvent e) {
int row=e.getFirstIndex();
if (row==previousRow) {
row=-1;

[Code] .....

The println shows that getValueIsAdjusting is called 4 times when I click a single selection from the list. Is this normal behavior? If so how do I determine which call to really use. If not, where can I look to see why it is being called 4 times on a single click?

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Nov 16, 2014

This is my first servlet program. I wanted to try a web application where "register" user module will be in servlet program.I can access my index.jsp but when I enter values and click submit.

I get "There is no Action mapped for namespace [/] and action name [RegisterUserServlet] associated with context path [/TrainingApplication]. - [unknown location]".

Here's my index.jsp file:

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>

[code]....

I am using apache-tomcat-8.0.14 server.

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May 1, 2014

Is there any way to skip the 2nd and 3rd questions in this instance if I input "exit" or make an error in the 1st input. Essentially skip over the "enter 1st number / enter second number" prompts and go straight to the switch statement? In the case of "exit" exit the program immediately without the prompts. If an error, loop around to the beginning without the further prompts.

import java.util.Scanenr;
public class Meddle {
public static void main (String args []) {
double n1,n2,answer;
Boolean check = true;

[code]...

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Dec 12, 2014

I have to ask the user to enter 4 whole numbers, and then the program will calculate:

> x numbers are positive and even
> x numbers are positive and odd
> x numbers are negative and even
> x numbers are negative and odd

but I have trouble with the conditions. How do I form the conditions to calculate this? My professor said I can do this with only four IFs (or ELSE IF). This is what I did:

import java.util.Scanner;
public class Calc{
public static void main(String [] args){
Scanner sc = new Scanner(System.in);
 
int pe = 0, po = 0, ne = 0, no = 0;
/* four variables for each result
pe - positive even
po - positive odd
ne - negative even
no - negative odd

[Code[ ....

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Oct 9, 2014

My instructions are to:

1. Prompt the user to input two positive integers: firstNum and secondNum (firstNum must be smaller than secondNum).
2. Output all the even numbers between firstNum and secondNum inclusive.
3. Output the sum of all the even numbers between firstNum and secondNum inclusive.
4. Output all the odd numbers between firstNum and secondNum inclusive.
5. Output the sum of all the odd numbers between firstNum and secondNum inclusive.

*Use while loop
int firstNum, secondNum;
Scanner keyboard = new Scanner(System.in);
System.out.println("Enter an integer: ");
firstNum = keyboard.nextInt();

[Code] ....

What to do with the while loop and how to find even and odd numbers.

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Jan 29, 2015

As a result I need to get 6 66 666 6666 66666, but I'm getting a mistake. Can anb explain what's wrong?

Java Code:

public static void main(String [] args)
{

int[] sixes = new int [6];
for (int i = 0; i < sixes.length; i++)
{
sixes[i] = i * 10 + 6;
System.out.print(sixes[i]);
}

} mh_sh_highlight_all('java');

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Mar 2, 2015

public class School {
public final int MIN_GRADE = 0;
public final int MAX_GRADE = 100;
private int [] grades;
public School( int students ) {
grades = new int[students];

[Code] ....

The output is :

The numbers in the array are: 1 2 3 4 6 7 8 9 10 13 14 15
The highest grade is: 11

For some reason it is not giving me the highest number in my array. Did I write the method wrong ? Is my array even passing through HighestGrade ?

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Jan 31, 2014

I have created a text file that contains a small list of toy names and prices, like:

Barbie, 12.95
Lego, 15.99
Hot Wheels, 5.00
Power Rangers, 6.49

And what I would like is my application to read the contents of the file and store the toy names in a list component. And then I want to be able to select a toy name from the list and add it to a shopping cart that is a list component as well. I want to the application to have menu items and buttons to allow me to remove items from the shopping cart, clear the shopping cart of all selections, and check out.

When I check out, the application should calculate and display the subtotal of all the toy names in the shopping cart, the sales tax (which can just be 8 percent of the subtotal), and the total. create this simple application example I've just made up, and I'm going to add and use this example to create a bigger application myself.

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Oct 23, 2014

Alright so I'm trying to write a code that implements a for loop and if statements that displays any number from 100-200 if the number is divisible by either 5 or 6 in rows of ten numbers each row. If it is not divisible by that number then it should go back to the beginning of the loop until it reaches 200. My main problem is that it doesn't display anything. I don't get any errors or anything but every time I run the program it just displays nothing. Sample output is at the bottom of the code.
 
public class Exercise5_11 {
public static void main(String[] args) {
int count = 0;
int i = 100; 
//for (the numbers from 100 to 200)
for (i = 100; i>100 && i<200; i++){
 
[Code] ....

/*Output
100 102 105 108 110 114 115 125 126 130
132 135 138 140 144 145 155 156 160 162
165 168 170 174 175 185 186 190 192 195
198 200
*/

It is still wip of course so I was trying to just get it to display int i but it doesn't do anything and I'm not really sure why.

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May 14, 2014

So I want the method getDisplayText of d to be returned as long as the for loop runs. When I do this I get a compile time error to enter a return statement. I am currently trying to fix it by returning an empty string, yet this doesn't seem the right way to go.

public static String displayMultiple(Displayable d, int count)
{
for(int i = 1; i <= count; i++)
return d.getDisplayText();
return "";
}

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Nov 26, 2014

I'm working on a project that involves the following:

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-Creating two subclasses, checkingaccount and savingaccount
-Each of the two subclasses has different methods (writeCheck for checking, for example)
-Both types are created in a main class bank and stored in the same array

So let's say a user goes through the menus and creates a few savingAccounts and a few checkingAccounts (stored in the accounts[] array). Then, to write a check from one account, the user can enter the account number (a string), and the method will use a for loop to cycle through the array until it hits an account number match. Then it checks that it's the correct account type and calls methods from the subclass.

Problem here is that some methods work and some don't. In the following example:

for (BankAccount account: accounts) {
if (account.getAccountType().equals("Checking")) {
do {
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amount = Double.parseDouble(JOptionPane.showInputDialog(

[Code] .....

The getAccountNumber method works but writeCheck is throwing an error. I tried creating a method in the superclass and overriding it in the subclasses but with no success.

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