Java Statement Getting Executed Multiple Times Outside For / While Loop
Aug 14, 2014
I am trying to execute the following method: This method takes a delivery date as one of the arguments and a list of calendar holidays as another argument. If the delivery date is present in the holiday list, I will add 1 day more to the delivery date and check again if the new delivery date is part of holiday list.
Issue is that the last 3 statements before 'return' are getting executed multiple times though there is no for or while loop. Why they are getting invoked multiple times.
@SuppressWarnings("rawtypes")
private String fetchNextWorkingDay(String sDeliveryDate, Element eleCalendarDayExceptions, SimpleDateFormat sdf, Format formatter) throws Exception {
System.out.println("");
System.out.println("Inside fetchNextWorkingDay method");
System.out.println("Del Date to compare is "+sDeliveryDate);
Boolean isDateSet = true;
[Code] .....
View Replies
ADVERTISEMENT
Mar 20, 2014
My program basically has 2 executeQuery statements. Based on the result of the first sql query the 2nd sql query gets executed (I intend to use if else ladder). The control executes the first query but never executes the second one.
MY CODE:-
//package searchbook;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import java.util.*;
[code]....
View Replies
View Related
May 8, 2014
The statement block when the while expression resolves to true is never executed, no matter what i type in:
String option="hit";
String option2="stay";
String choice = null;
int yTotal = 0;
[Code] .....
View Replies
View Related
Mar 22, 2014
I read on how to use the continue statement, but I'm failing in how to use it properly, mostly because it's not working. I'm supposed to print out what numbers are showing up and how many times for each. Plus, I have to print out 'times' instead of 'time' if there's more than one of a certain number. Right now, it's printing out all the numbers including the ones that don't get inputted.
import java.util.Scanner;
public class occurrence {
public static void main(String[] args) {
//scanner/values
Scanner input = new Scanner(System.in);
int number = 101;
[Code] ....
View Replies
View Related
Jan 24, 2014
I just started playing around with Java for awhile, but got caught up in a problem when using ArrayList.
CinemaAppMain
public class CinemaAppMain {
public static void main(String[] args) {
new CinemaApp().start();
[Code]....
I am trying to get the movie name and theatre title from their ArrayList, and I know I need to go through the movie list & theatre list to find their name & title, and compare it with the user input and print out the result.
I use for(int i=0;i<movies.size();i++) to go through the the movie list, and I tried using for(int i=0;i<theatres.size();i++) to go through the theatre list. But when I printing multiple time with different user input value, it will show me strange result (screening have same movie name & theatre name, the else if statement is printed below the user input, user input is printed more than once after the first time).
Edit: I know its wrong for me to use nested for loop,if not, another solution is needed to get the item inside both of the list. (getting the "title" from movie list & "name" from theatre list)
View Replies
View Related
May 18, 2014
I have made a basic math game that asks you questions and tells you if you have answered them correctly or incorrectly. The game runs great! The thing is that it asks you a question one time and after you answer you have to run the program again. I want to get the program to ask ten questions. After that I want to figure out a scoring system for it but the first step is to get it to ask my ten questions. Here is my code.
package pkgnew;
import java.util.Scanner;
import java.util.Random;
public class New {
public static void main(String args[]) {
[Code] .....
View Replies
View Related
Feb 16, 2015
I'm working on a problem that requires me to generator all possible word combinations based on a 7-digit number as input. Many of the generated "words" will be nonsense, but some with be "NEWCARS", "TAKEOUT", etc... This problem mimics the phone number a company would use to support clients remember that number.
I completed the exercise, but I would like to explore more elegant solutions. Specifically, I've used an IF-THEN-ELSE condition inside of a FOR loop. Here is my working code:
package com.johnny_v.exercises.telephone;
public class WordGenerator {
public static void main(String[] args) {
int numOfTimes = 2187;
String two = "ABC";
String three = "DEF";
String four = "GHI";
[code].....
I receive StringIndexOutOfBoundsException exceptions. I it's because multiple conditions are matched. For example, the indexSix is reset to 0 when row is a multiple of 9. Because row is also a multiple of 3, this condition also executes and then increments "indexSix".
View Replies
View Related
Apr 14, 2014
how we can call one class in multiple programs to reduce code redundancy
View Replies
View Related
Sep 26, 2014
I am trying below challenge to display first three characters three times if the size of the string is greater than 3.
Say if i send hello i should get helhelhel
if i send xyz i should get xyzxyzxyz
I wrote as below
public String front3(String str) {
if(str.length()==3){
return str+str+str;
}
if(str.length()>3){
String str2=new String(new char[]{str.charAt(0),str.charAt(1),str.charAt(2)});
return str2;
}
}
I am getting error as below
Error:public String front3(String str) {
^^^^^^^^^^^^^^^^^^
This method must return a result of type String
Possible problem: the if-statement structure may theoretically allow a run to reach the end of the method without calling return. Consider adding a last line in the method return some_value; so a value is always returned.
View Replies
View Related
Aug 5, 2014
I am developing a java swing application. In which i want to set a different text to a label in same program ( in single JFrame). I dont want to use another JFrame instead i want to use setText method of java and set different text to a label at different intervals of time according to my need.
I am using java 1.7 sdk and pupy linux as OS. Below i am giving source code.
What i am doing is in constructor of class i am setting an image to JFrame and setting text "Welcom...". And when user clicks on this JFrame a method is called which will clear the text "Welcome.." and sets new text to another label "Enter...." and from there another method is called and it clears label "Enter..." and sets a text "Plzz wait..". and yet there are more methods, i havnt provided here.
But what is happening is it shows welcome text and then directly Plzz wait..
Its not showing text Enter... because control is finished after last method gets executed.
My concern is i want to show all the setText (my messages) in a sequence. Without using another JFrame. There is no any user input other than user will click on first welcome page.
public class BackgroundFrame extends javax.swing.JFrame {
JLabel setTitle1;
JLabel setTitle2;
JLabel setTitle3;
JLabel setTitle4;
[Code] ....
View Replies
View Related
Nov 25, 2014
I currently have a datatable on the bookingList.xhtml which is supposed to list all bookings made, if first booking petName is spot it displays the booking details perfect but if another booking is made (for example one with petName fluffy) then it displays 2 lines with fluffys details and spots details are not displayed, it carries on that if a third booking is made then the 3rd bookings details are displayed 3 times and neither spot or fluffys booking details are displayed,
bookingList.xhtml code
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:p="http://primefaces.org/ui">
[code]....
View Replies
View Related
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?
View Replies
View Related
Oct 27, 2014
So I am calling this method several times and trying to write multiple records to a file. Problem is that every time I call the method it overwrites the file from before and doesn't add it.
public void fileWriterMethod() throws IOException{
RandomAccessFile raf = new RandomAccessFile(filename, "rw");
raf.writeInt(id);
raf.writeInt(existingMileage);
raf.writeInt(gasCost);
raf.writeInt(ndays);
raf.writeInt(rate);
raf.writeInt(totalCharge);
raf.writeInt(discount);
raf.writeInt(tax);
raf.writeInt(netCharge);
raf.writeInt(returnMileage);
raf.writeBytes(carName + "
");
//Closing the stream
raf.close();
}
View Replies
View Related
Jun 14, 2014
I am having is not being able to print out the diamond the amount of times the user enters (for example, when it asks how many diamonds, I enter a 2 and only one diamond comes out.)
import java.util.Scanner;
public class Pattern5
{
public static void main(String[] args)
{
// For this pattern program, ask the user how many diamonds
// she would like to print to the screen. The following pattern is one diamond.
[code]...
View Replies
View Related
Oct 4, 2014
I know the normal way of naming objects is
Pipe pipe1 = new Pipe
but I want the objects to be made inside a loop and named after how many times the loop have been gone through so I tried
Pipe pipe(numberOfTimes) = new Pipe
where numberOfTimes was a variable counting the loops. This is not working.I need the naming to be pipe1, pipe2, pipe3 etc depending on how many times the loop have been pased
Scanner keyboard = new Scanner (System.in);
String morePipes = ("yes");
int dimRor;
int numberOfPipes = -1;
[code]....
View Replies
View Related
Dec 2, 2014
I have been baffled by the functioning of repaint() - and the SwingPaintDemo3 with the moving square seems mysterious - you call repaint(x,y,w,h) twice and the first time it clears the clip area and the 2nd time it paints the red box. The code in paintComponent tells it to paint the box both times, yet somehow it ignores the initial box and only paints the 2nd one.
I've been writing code to bounce some balls in a box to try and understand the behavior. I set up an array of ball objects, loop through them, move them adjusting for collisions with walls and each other, then repaint(). I call repaint x2 for each ball, just like in the example. In my paintComponenet code, if I try to just paint the current ball only one ball will move, even if I send a different ball object each time. The only way to get all the balls to show up is to put a loop in paintComponenet that goes through all 100 balls every time I call it. I was worried that to move 100 balls I was painting 100x100 times.
So I put some System.out.println commands in my ball move loop, inside my object ball draw commands, and inside the paint component.
private void calculateMoveBall(BoxBalls oneBall) {
System.out.printf("
Entering calculateMoveBall [%1$2d]
",
[Code].....
So even though I called repaint() 200 times (twice for each ball), repaint was actually only called once, drew all the balls at once, and then went back. And I just noticed it appears to have waited until I exited the calculateMoveBall loop to go into paintComponent! The spooky things is how does it know to do that? Does the Java machine 'see' that it is inside of a loop, and perhaps also sees the loop inside of paintComponent, and somehow correctly guesses that it doesn't have to do it 200 times, but can wait and do it once? If I attempt to do the same thing in code, take the loop out of paintComponent() and call repaint() with the current ball, expecting the machine to do exactly what I tell it, it refuses and does it's own thing, waiting to call paintComponent on the 100th ball, drawing only the last ball (so I guess the loop inside paintComponent is not in the logic).
So a call to repaint() is a request for a higher being to decide if it has the time or energy to repaint the clip. If not, it ignores the call, or stacks them up for later (maybe I should try a million and see if it has room for that!) - well so far up to 4000 it behaves the same. This is useful if you are happy with "this is how it works so use it that way". However I really don't like having some kind of hidden logic that I have to trust to work the right way. If I don't want it to wait until later I'm not sure what to do. And I don't trust the machine to do whatever whenever. How do you debug that???
Questions: Is there documentation to know what repaint() will do or how it decides when to call paintComponent? The Swing tutorial gives the example but not the why. "By now you know that the paintComponent method is where all of your painting code should be placed. It is true that this method will be invoked when it is time to paint" "An important point worth noting is that although we have invoked repaint twice in a row in the same event handler, Swing is smart enough to take that information and repaint those sections of the screen all in one single paint operation. In other words, Swing will not repaint the component twice in a row, even if that is what the code appears to be doing." (What the code appears to be doing - now we have to guess what it is doing)
Is there a way to force repaint() to call paintComponent on a clip rectangle (not just on the whole thing?) I would think invalidate() would force repainting of the whole componenet.
Perhaps this is when you draw to a bitmap in memory and paint the whole thing on the screen...
View Replies
View Related
Jan 21, 2015
I have this very code:
if (minute > 35 && hosts < 1 && guests < 1)
In this if statement I would also like to add another two possibilities:
first would be: hosts < 1 && guests < 2
second would be: hosts < 2 && guests < 1
Is it possible to somehow add it so it can all be in included in one if statement, and it would look something like that:
if (minute > 35 && hosts < 1 && guests < 1 OR
minute > 35 && hosts < 2 && guests < 1 OR
minute > 35 && hosts < 1 && guests < 2) {}
.. ?
View Replies
View Related
Jan 16, 2014
I'm using this try statement to check for errors in input in my Tic Tac Toe game. The problem I have having is I don't understand why this error is happening. It's preventing my code from compiling. I've tried inserting an else statement and multiple brackets at various places with no success.
Java Code:
public void play(){
Scanner input = new Scanner(System.in);
int row, col;
char currPlayer = 'X';
[code]....
View Replies
View Related
Nov 29, 2014
I've done a basic login GUI for a application, a user enters their name and address and clicks register, a four digit pin is then randomly generated, the pin and name and address are all added to an object of the MemberDetails class , this obj is then added to an array list.
returning customers can then enter a previously generated pin and either get a welcome back message or an invalid pin message.
my issue if i register two new users and get their generated pins, that on the returning members screen it will only show the welcome message for the second new customer i created and not recognizing the first customers pin. heres my code:
taking in new customer details, generating pin , adding obj to arraylist
int randomPIN = (int) (Math.random() * 9000) + 1000;
members = new MemberDetails();
members.name = nameNew.getText();
members.address = addressNew.getText();
members.pin = randomPIN;
[Code] ....
that lest method is a bit of a mess i know, i was going to store the log in attempts in a array but thats probly not a good tactic, and that inner for loop is probly unnecessary ?
View Replies
View Related
Aug 23, 2014
I am having trouble doing a simple exercise changing a for loop to a while statement, it works fine in the for loop but in the while statement it just prints out 10(it is supposed to count to 0 and print liftoff).
public void run() {
int i = 10;
while (i>=1) {
println(+i+"...");
i--;
}
println("liftoff...");
}
View Replies
View Related
Sep 23, 2014
I am having a problem with looping a while loop that contains a switch statement. Here is my code:
package hw4jenningsd;
import javax.swing.*;
public class HW4JenningsD {
[Code].....
View Replies
View Related
Dec 8, 2014
I am trying to add a while loop into my switch statement. If you run the program, it will ask to enter the class grade (9,10,11, or 12). If you insert 5, it will say to try again. But, if you enter a wrong number twice, it will continue on to the next part of the program, which is asking how many students are in the class. Therefore, I believe a while loop would work, but it is not working at all. The program still runs, just doesn't fix the error. The program is below:
import java.util.Scanner;
public class stephProject {
public static void main(String[] args) {
//call method
welcomeMessage(); //method 1 of 3
[Code] ....
View Replies
View Related
Apr 26, 2015
Here is my code so far. I am trying to get the WHILE LOOP to work so the user inputs a number, the if statement prints the output and then it returns to ask for another number and goes again and again looping :
import java.util.Scanner;
public class ifwhileloop {
static Scanner sc = new Scanner(System.in);
public static void main(String[] args) {
double nmbr;
[Code] ....
View Replies
View Related
Dec 12, 2014
I made this calculator in C++ and it worked wonderful so I decided to make it in java. When I run the program it gives me no errors but my if statements inside my while loop don't work
import java.util.Scanner;
public class ohmlaw {
public static void main(String args[]) {
float current;
float resistance;
float voltage;
String calchoice = new String();
Scanner cc = new Scanner(System.in);
[code]....
View Replies
View Related
May 5, 2015
cannot break from while loop. Whenever I am trying to exit from startCustomerManagement-> backEnd() -> mainScreen()..It gets stuck between mainScreen and backEnd screen. However I can exit from backEnd()->startCustomerManagement() screen
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package javaapplication19;
import java.io.BufferedReader;
[code]...
View Replies
View Related
Mar 13, 2014
I have to take user input and then count how many times each number that the user input and print each one out. For some reason, I can't even get the for loop statement to print and it's pretty much the same as my other program except for the loop which is a little different.
//User inputs numbers between 1 and 100, program counts how many of each integer is and ends with a 0
import java.util.Scanner;
public class occurrence {
public static void main(String[] args) {
//scanner/values
Scanner input = new Scanner(System.in);
int number = 0;
int c = 0; //array count
[Code] ....
View Replies
View Related
