JavaFX 2.0 :: Perform Boolean Operations On 3D Primitives?

Nov 10, 2014

How to perform boolean operations (union, intersect and subtract) on 3D primitives in javafx 3D?

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Swing/AWT/SWT :: How To Code Button That Get Selected Element From JComboBox And Perform Operations

Aug 6, 2014

i've spend an hour or two, pasting fragments from tutorials and nothing changed.

Well - i have GUI, that have JComboBox with two elements:
String[] fedoras = { "Fedora 19", "Fedora 20" };
JComboBox fedora_list = new JComboBox(fedoras);
fedora_list.setSelectedIndex(0);
fedora_list.setBounds(120,170, 170,25);
fedora_list.addActionListener(this);
this.add(fedora_list);

Below i have normal button (named Update) with "update" set as ActionCommand. This button after clicked should check which value from list is selected and perform different operations for that elements. But it's harder than i thought.

Code for update button:

public void actionPerformed(ActionEvent e){
String cmd = e.getActionCommand();
(...)
else if ("update".equals(cmd)){
String selectedFedora = (String) fedora_list.getSelectedItem();
if (selectedFedora.equals("Fedora 19")) {

[code]....

- after user clicked Update button, button should check which value is selected in JComboBox (fedora_list).
- if Fedora 19 is selected and button clicked, then action in Xterm
- if Fedora 20 is selected, this same action in Xterm is performed, but for Fedora Linux 20

The problem is - i don't know hot to code Update button to check which value from fedora_list (JComboBox) is selected and perform other actions for every element on List.

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Create All Primitives With Different Values

Jul 6, 2014

I just recently started coding java and i have a problem.... So I was doing an exercise on LearnJavaOnline. The exercise was: Create all the the primitives with different values. Concatenate them into a string and print it to the screen so it will print: H3110 w0r1d 2.0 true.I attempted it and this is what i wrote

public static void main(String[] args) {

char H = 'h';
byte e = 3;
short l = 1;
int L = 1;
long o = 0;
char w = 'w';

[code]....

However it prints "109 w0r1d 2.0 true".But when i add 2 speech marks: String HelloWorld = H+""+e+l+L+o+" "+w+0+r+one+d+" "+two+" "+hi; It works perfectly.

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Java Primitives And Boundaries

Jul 22, 2014

Take a Java (Oracle SE 7 JVM) long, primitive or it's wrapper class... assign a variable with the value slightly less than 2^63-1 (the maximum value... i.e. infinity? for a long); keep adding 1. What happens? You quite quickly get - minimum long, or minus infinity (?).Infinity is my perspective from a Mathematics degree.

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How To Count Primitive Operations

May 2, 2014

I have having some trouble on counting the primitive operations on the pseudocode given below:

Algorithm 4. MaximumArray(Arr)
Input: A 1-D numerical array Arr of size n
1) Let CurrentMax = a0
2) For i = 1 to n-1
3)If ai > CurrentMax Then CurrentMax = ai
4) End For
Output: CurrentMax, the largest value in Arr

As of now, I know that for Line 1 there are 2 operations (one set and one read). I don't know how to figure out the for loop and If statement (line 2 and line 3 too).

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Nested Loops Or Set Operations?

Oct 10, 2013

Is there any advantage to using Java's operations defined in sets or collections over inspecting in nested for-loops?

For example, suppose I want to keep items from one array that do not appear in another, I could do:

for( PrimitiveType prim_1 : someArray ){
for( PrimitiveType prim_2 : otherArray ){
if( prim_1 != prim_2){
///put in some return list
}
}
}

Or else I could do:

ArrayList<NotPrimitive> excludedElements =
new ArrayList(Arrays.asList(primitiveArrayToExclude));
for( PrimitiveType elem : someArray){
if( ! excludedElements.contains( elem ) {
//put in some return list
}
}

I personally see no improvement in legibility nor any reduction of error potential.....

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I/O / Streams :: Any Way To Parallel I/O Operations

Jul 31, 2014

I've been wondering about this for a while. Is there any way to parallel I/O operations or is this a bad idea? If you could create two lists of good and bad ways to parallelize I/O.

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Using A Menu For Stack Operations

Dec 3, 2014

I am working on implementing a stack using a linked list. Programming the stack operations (push, pop, isEmpty, etc.) was easy but my directions were to provide the user with a menu to choose the operation that he/she wishes to perform. I am new to JFrames/Menus so how to make the stack operations available in a menu.

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Illegal Start Of Operations For All Methods

Apr 21, 2015

Where are all these illegal start of operations and all of these other method errors coming from.I've written enough methods not to have this problem.

----jGRASP exec: javac -g Assessement.java
Assessement.java:29: error: illegal start of expression
public void addQuestionAnswer(){
^
Assessement.java:29: error: illegal start of expression

[code].....

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How To Compute All Possible Arithmetic Operations Of 4 Integers

Nov 25, 2014

I'm new to Java and I want to write a program that compute all the possible arithmetic operations of 4 integers.

For example, if the user enter 1, 2, 3, and 4 respectively, then I want the computer to print out the following results:

1 + 2 + 3 + 4
1 + 2 + 3 - 4
1 + 2 + 3 * 4
1 + 2 + 3 / 4
..
1 / 2 / 3 / 4

(parenthesis can be ignored for this program)

This is what I have so far, but I don't know how to continue:

import java.util.Scanner;
public class ArithmeticComputation{
public static void main(String[] args) {
Scanner stdin = new Scanner(System.in);
int num1 = stdin.nextInt();

[Code] ....

I'm looking for a method that allows me to assign char into actual operators, so that I can loop through all the computation.

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LISP Expression - Performing Operations

Jan 29, 2015

Given a LISP expression, perform operations on the expression. There will be no list elements that also contain a list such as '(A (B (C D))), which has one atom and one list but the list contains a sublist

INPUT: There will be 5 lines of input. Each line will contain a valid LISP expression. There will be a space between each atom and each list. There are no spaces immediately after or immediately before parentheses in a list. The entire expression must be inputted as a single string.

OUPUT: Perform the given operation on the like numbered expression. The 5 operations are:

1. Print the expression with the list in reverse order. The list will contain only atoms.

2. Print the expression with the list written with consecutive duplicates encoded as sublists in (count element) order. The list will contain only atoms.

3 Print the expression with the list written with consecutive duplicates encoded as sublists in (count element) order except that singletons are listed as atoms. The list will contain only atoms.

4. Print the expression with the list written with every Nth element deleted and where N is the last element of the list.

5. Print the expression written as 2 expressions where the number of lists in first expression is the last element of the expression.

SAMPLE INPUT SAMPLE OUTPUT
1. '(A B C D) 1. ′(D C B A)
2. '(A A A A B C C A A D E E E E) 2. ′((4 A) (1 B) (2 C) (2 A) (1 D) (4 E))
3. '(A A A A B C C A A D E E E E) 3. ′((4 A) B (2 C) (2 A) D (4 E))
4. '((4 A) (1 B) (2 C) (2 A) (1 D) (4 E) 2) 4. ′((4 A) (2 C) (1 D) 2)
5. '((4 A) (1 B) (2 C) (2 A) (1 D) (4 E) 3) 5. ′((4 A) (1 B) (2 C)) ′((2 A) (1 D) (4 E) 3)

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Unchecked Or Unsafe Operations While Compiling Program?

Jun 30, 2014

String filename="C:UsersRajashekarDesktopfwfwdSoftware Failures1_Test.txt";//Input Files
String data;
public ArrayList<String> value=new ArrayList<String>();
public void read() throws IOException{
File f = new File(filename);

[Code] ....

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What Are Interleaving Operations - Can Atomic Actions Interleave

Mar 24, 2014

I have read that when two threads have two steps (of execution) and each step involves many operations, then the operations of both the threads kind of overlap one-another. For example

I think I am not very clear about interleaving actions/operations? Especially when we say that atomic actions can not be interleaved. But

Java Code:

class Counter{
private int c=0;
void increment () {
c++;
}
void readIn () {

[Code] ....

And the following sequence of events occurs.

Thread A: Retrieve cThread A: Increment cThread A: Store the result in cThread B: Ask the user to enter a valueThread B: Read in the value, store it in c

Now the value of c obtained after increment will be lost (Thread Interference). Isn't this an example of interleaving operations?

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JSP Calculator - Performing Basic Operations On Numbers

Jul 8, 2014

I want a simple jsp page that performs basic operations on numbers such as addition, subtraction, multiplication, division and modulus . How to run that file?

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Queue Operations In Java - Using Reference As Pointer

May 28, 2014

I am trying to run the queue operations in java such as enqueue, dequeue using pointers ... How to use references as pointer in java.

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Simulate Simple Calculator That Performs Basic Arithmetic Operations Of JAVA

Sep 9, 2014

How can i write a java program that simulate a simple calculator that performs the basic arithmetic operations of JAVA. (JOption Pane and Repeat control structure)

Example : Addition, Subtraction, Multiplication, Division.

The program will prompt to input two floating point numbers and a character that represents the operations presented above. In the event that the operator input is valid, prompt the user to input the operator again.

Sample Output :

First number 7
Second number 4
Menu

<+> Addition
<-> Subtraction
<*> Multiplication
</> Division

Enter Choice: * <enter>

The answer is 28.

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How To Perform Soft Delete

Feb 25, 2014

how to do soft delete?

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While Loop To Perform Multiple Steps

Mar 20, 2014

Write a program that uses a while loop to perform the following steps: Comment by labelling each part: //Part A, //Part B, etc...

A.)Prompt the user to input 2 integers: firstNum and secondNum. Use 10 and 20.
B.)Output all odd numbers between firstNum and secondNum.
C.)Output the sum of all even numbers between firstNum and secondNum.
D.)Output the numbers and their square between 1 and 10.
E.)Output the sum of the square of odd numbers between firstNum and secondNum.
F.)Output all uppercase letters.

Again I am new to while loops and I am totally lost. I have just completed 8 other programs using if else statements and now trying to get the hang of loops.

import java.util.Scanner;
public class whileLoop {
public static void main(String[] args)

[code]...

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Write A Method That Uses For-loop To Perform?

May 19, 2014

which when user enter a number then will display how many * in a line .Produce a line: ***** But my code only show 1 * there... what wrong with it ?

import java.util.Scanner;
public class display {
public static void main(String args[]) {
int i,n = 0 ;

[Code] ...

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How To Get One JButton To Perform Sequential Actions

Aug 18, 2014

How to get my program to display a piece of text (upside down) on the first button press, and then display it right-side up on the second button press. I've looked all over the internet and I can't seem to find a example that fits my situation.

Here is the code:

package org.CIS407.Lab10;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class JUpsideDown extends JFrame
implements ActionListener

[Code] ....

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How To Perform Calculations Using Stacks Java

Nov 23, 2014

I am doing a calculator using stacks but when i try to calculate I getting the wrong data example stack contains 8 and user enter -3 stack should change to 5.

package comp10152.lab5;
import java.util.Scanner;
import java.util.Stack;

[Code].....

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How To Perform Tasks Listed In Text File

Feb 12, 2015

This has three different classes in a package and the program itself is supposed to read and perform operations obtained from a txt file. However, I'm not even sure how to get it to perform the operations from the text file. I know that it can read the file as I was able to get the program to print the text found in the file when I ran the program with a test print to make sure that all content was being read. However, I am clueless when it comes to how to get the program to look at the text as commands.

Here is the piece of code that I am not sure where to go from as far as telling the program to read the text and perform the tasks listed.

public static void doTVoperations(){
File operations = new File("operations.txt");
if(operations.exists())
try{
Scanner n = new Scanner(operations);

[Code] ....

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Perform Action Only If Certain Amount Of Time Has Passed

Sep 18, 2014

public static void main(String[] args) {
boolean t=false;
long cuTime = System.currentTimeMillis()
while(t==false) {
System.out.println(cuTime);
long g=cuTime+2000;

[Code] ....

I tried this and it includes a while loop as the whole program has to wait until this while loop executes. So the entire program slows down. Is there any way to do this without a while loop

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How To Perform Action Only If Certain Amount Of Time Passed

Sep 18, 2014

public static void main(String[] args) {
boolean t=false; 
long cuTime = System.currentTimeMillis();
while(t==false) {
System.out.println(cuTime);
long g=cuTime+2000;

[Code] ....

I tried this and it includes a while loop. therefor the whole program has to wait until this while loop executes. So the entire program slows down. Is there any way to do this without a while loop...

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How To Perform Row Operation - Store Data Into 2D Matrix

Sep 18, 2014

I am able to perform column operation but not able to perform row operation because i am not able to store data say a 2 matrix [][]. I need to store the data into a 2-D matrix. Here is my code:

Java Code:

import java.awt.List;
import java.io.BufferedReader;
import java.io.FileReader;
import java.util.ArrayList;
import java.util.Scanner;
public class colRowRead {

[Code] ....

I tried something like that:

for(int i=0; i<rows; i++) {
for(int j=0; j<cols; j++){
matrix [i][j]=textFile.get(i).split(" ");
//System.out.println(matrix[i][j]);
}
}
*/ mh_sh_highlight_all('java');

File col.txt is like this:

Java Code:
5 9 7 1 5
3 6 8 6 8
4 6 7 8 9
9 8 3 5 7 mh_sh_highlight_all('java');

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Automated Web Browser To Perform Specific Tasks

Jul 14, 2014

I need to know how to automate a web browser (either Chrome, Firefox or Safari) to perform the following task.

Take a word from a .txt file housed on my hard drive,

1) put it into a search engine,
2) load the results,
3) click on/ open the first result,
4) open up an new tab and perform steps 1-3 again but with the next word from the .txt file. 4-5 second pauses are needed in between each step.

Additionally, I would like to automate the browser to close all the open tabs when a full stop is pulled from the .txt file.

I am using a macbook and 10.6.8 OS.

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