Clear Sign Not Working On Calculator?
Jan 15, 2014
Here is the code I wrote:
import javax.swing.*;
import java.awt.MenuBar;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class NewCalculator implements ActionListener {
//assign button clicked number and answer onto variables.
[Code] .....
Also what is the code I need to use to do the percentage and square root calculation in the calculation. Cos I am not sure about the sign I am required to use to do the calculation.
The if statement is where the code to make the clear button (C and CE) work.
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Mar 30, 2014
I need to design the layout of this calculator and also add one more button that clears textbox strings one by one instead of whole.
import javax.swing.*;
import java.awt.FlowLayout;
import java.awt.event.*;
public class Calculator extends JFrame{
double value1;
double value2;
String operator;
double result;
[Code] .....
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Sep 27, 2014
why CLEAR button not sweeping text(I tried t1.setText(null);, but it not working. And second, in SAVE button is same problem, it is not working. I want it to saved text go to SAVED frame. What i need to write.
public class panabut {
public static void main(String[] args) {
JFrame f = new JFrame("Buttons");
f.setSize(400, 400);
f.setLocationRelativeTo(null);
f.setDefaultCloseOperation(f.EXIT_ON_CLOSE);
f.setVisible(true);
JPanel p = new JPanel();
f.add(p);
JButton b = new JButton("Register");
[code]....
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May 6, 2014
import javax.swing.*;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.*;
[code]....
My issues is at the bottom, I can't get the clear button to clear, well it clears but it also show the JOptionPane. I couldn't find the edit button on the page
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Nov 19, 2014
This code works perfectly except for option C and E. Why it just returns me to the main menu?
public class BasicStatisticsCalculator {
static final int NUMBER_OF_ELEMENTS=6;
static int[] numbers=new int[NUMBER_OF_ELEMENTS];
[code]....
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Sep 5, 2014
Why the JFrame is not working
// Project: RestaurantBillCalculator.java Calculates a table's bill.
// Import statements for different classes
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
import java.text.*;
import java.util.*;
import javax.swing.*;
public class RestaurantBillCalculator extends JFrame
[Code] ....
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Oct 22, 2014
Prompt for the project is "Write a program that will ask the user for a number of seconds and output the equivalent period of time in days, hours, minutes, and seconds.The program should:
-Use modulo division to calculate the number of days, hours, and minutes.
-Use compound operators when making assignments.
-Proper formatting and use of comments
-Symbolic constants defined as the number of seconds in a minute, hour, and day.
For example: final int sec_in_min = 60;"
public class Mod1
{
public static void main (String[] args)
{
int sec, min, hr, day;
final int SEC_IN_MIN = 60;
final int SEC_IN_HR = 60 * 60;
final int SEC_IN_DAY = 60 * 60 * 24;
[code]....
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May 11, 2015
There's a site that uses DBsign UWS to validate personal certificates on a smart card. I wound up breaking that functionality by moving the default Java truststore so I could create a new one with just root/intermediate CAs that I trust (I have no desire to allow apps signed in China, Russia, Turkey, and countries spelled with heiroglyphs). Now, my browser believes the UWS is self-signed and rfuses to run it. I need to find the certificate used to sign that app to see which cert(s) signed it, so I can add them back to the truststore. How can I find that?
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Sep 23, 2014
I want to check to see if given integers digits a, b are both positive or both negative. How do i do that in java.
how to check below number 'a' is negative or not in if condition using signum method?
if(Integer.signum(a)==-1){
Above line is not working
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Apr 27, 2015
I have a checksum function that is suppose to read IPV4 packet and return a short integer value. The IPV4 packets are stored in a byte array. I am having trouble storing the first 8 bits and second 8 bits of the short integer into the byte arrays especially when they have leading 1s. For example, if my checksum returns 5571 (binary = 0001 0101 1100 0011) The first 8 bits is suppose to represent 195 but when I try to assign a larger integer type to a btye the information gets sign extended. The 195 turns into -61. I tried using bit addition like array[10] = array[10] & 0xff, but the result remains the same.
public static short checksum(byte [] a, int length) {
short sum = 0;
long data;
int i = 0;
while(length > 1) {
data = (((a[i] << 8) & 0xff00) | ((a[i + 1]) & 0xff));
sum += data;
[code]....
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Mar 7, 2015
I am having a bit of trouble making the '+' add two numbers in java. For example:
When the user enters " + 4 5 " I want it to come out as " 4.00e+00 + 5.00e+00 = 9.00e+00 "
Here is what I have so far:
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
while (in.hasNextDouble()) {
double num1 = in.nextDouble();
double num2 = in.nextDouble();
String s = "";
[Code] .....
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Nov 15, 2014
i know that int [][] x = new int[2][2] will generate a 2x2 array but I'm looking at a certification mock question and I see double [][] da = new double [3][]. What is the empty [] on the right hand side of the equal sign trying to tell me? Is there some default value?
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Apr 2, 2014
How to clear console screen ? I am using Linux machine.
1) Runtime.getRuntime().exec("clear"); // this is not working. Not clearing the screen
2) for ( int i = 0; i < SOME_NUMBER; i++)
System.out.println();
2nd way is working but i think it is not a good option as i need to move scroll bar again and again.
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Aug 12, 2014
I have a code that clear old text then add new text to text file afterthat download the file but the problem my code dose not add new text
FileInputStream fileToDownload ;
private static final int BYTES_DOWNLOAD = 1024;
response.setContentType("text/plain");
String name = request.getParameter("n");
String text = new String(request.getParameter("text").getBytes("iso-8859-1"), "UTF-8");
[Code] ....
How to clear old text then add new text to text file
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May 26, 2014
Follow the //? FIRST and SECOND notes, then I understood that Java has GOTO as Keyword for future versions and that usually one can avoid GOTO using break inside the cycles, but I need a jump( salto) in the code.
import java.util.Scanner;
public class ArrayOrdinati {
public static void main (String[] args){
int[] Array = {5,3,1};
int e=Array.length;
int b;
[Code] .....
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May 2, 2014
how to clear my java output console?
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May 11, 2014
I have wrote the method delete turtle below. Which is part of turtle collection (Hashmap)
public void deleteTurtle(String name) {
Iterator iterate = turtles.keySet().iterator();
while(iterate.hasNext()) {
String key = (String)iterate.next();
if(key.equals(name)) {
iterate.remove();
} else {
setErrorMessage("notFound");
}
}
}
I need to now modify it so the method ensures that the turtles shape collection is cleared before the Turtle object is deleted.
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Oct 13, 2009
I have 5 radio buttons in my gui, I have a reset button which I have resetting everything else but now I am looking to remove the dot from the selected RB when you press the reset.
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Jul 10, 2014
I have following code
int id1=1;
String city1="Dehradun";
float rupee1=2.1f;
double salary1=2.123;
[code]....
But when i again view it using datainputstream it display original Values.how to view correct data written from outputstream as it is in textpad file
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Apr 26, 2014
I've got my clear button to work on most of the stuff I want, however I cant figure out how to fix the price to stop adding up. e.g. hit a button image with a price of 599.99, hit the clear button to empty, select price of 599.99 again then it display 1199.98.
sofa method
if (source == jBSofa) {
System.out.println("Sofa"); {
dTotal = dTotal + 599.99;
jTotal.setText(Double.toString(dTotal));
jTotal.setText(String.format("%.2f", dTotal));
}
Reset method
private void Reset() {
jTTotal.setText(" ");
jTotal.setText(" "); //sub total clear
jTTotalTotal.setText(" ");
Attached image(s)
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Oct 20, 2014
I am trying to clear all graphical objects of a certain type(all trees in particular). I have never had any issues doing so, and this method normally works well along with these variables:
Java Code:
public static ArrayList<GRect> historyT;
public static ArrayList<GOval> historyL;
public static GRect trunk;
public static GOval leave;
public void deleteTrees() {
//clears all tree trunks and leaves
[Code]...
That is this normally worked until I started added more trees to the screen after they had all been erased. What happens is that it won't clear all of them unless the max has been reached, that is 6. It will remove all trees up till the last one if the max has not been reached. In other words here is my screen before the clear all if the max has not been reached(* is a tree, _ is erased): ****
Here is it after: _ _ _ _ *
So my question is, is why aren't all the trees deleted? Why does it leave one left behind?
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May 7, 2014
I'm having a small problem using a jTable.
After calling the .clearSelection() methode of the table object, the cell clicked in when selecting the table row, keeps it's focus.
How do I remove the focus of the cell?
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Mar 25, 2015
package com.example.imc;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
[Code] ....
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Mar 31, 2014
I am very Java illiterate and I need to know how would i set all the variables in the first class to null or 0 to make a new method to clear everything.
import java.util.Arrays;
import java.util.Scanner;
public class studentMethods
{
private double totalScore;
private int count;
[Code] ....
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Nov 9, 2014
I'm back with a question about the Black Jack assignment. I've created a working game that works for one round, as well as a reset button that's able to clear the board of the old hand. However the runGame() loop, which checks whether a player has played his hand seems to freeze the program the second time around
private void initNewGame(){
dealer.addCard();
for(int i = 0; i < numberofplayers; i++){
players[i].addCard(); //draws card, adds score and paints card to the board
players[i].setStatus(false); //makes the buttons usable in the players[] class
[Code] .....
I know it's probably not optimal having an while loop constantly running to check the status, but I can't seem to figure out why it freezes.
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Apr 10, 2014
I am developing an application to share my client screen with server, it is working well on swing. But i want to develop as web application, i am trying to using applet. But i am facing the fallowing problem..,
1) The Applet screen also open and project also running well on server mechine. But unable to see the client screen on the server.
2) The problem may be to display the JDesktopPane or JInternalFrame.
My working Server Code extends withe JFrame..Java Code:
package remoteserver;
import java.awt.BorderLayout;
import java.awt.Container;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import javax.swing.JApplet;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
[code]....
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