I know how to do single selection, but I would like to do multiple row selection only by using CTRL + click without the option of dragging the mouse to select rows. So the user would have to hit ctrl + click each time to highlight additional rows.
The below program ask the user to enter the value of x 1 , Y 1 and radius in separate boxes , What would look nice is if the user can Enter the Value X ,Y and radius in the same box.
import javax.swing.JOptionPane; public class C3E29GeometryTwoCircles { public static void main(String[] args) { // Ask the user to enter the x1 coordinate. String strNumber = JOptionPane.showInputDialog("Enter the value of x1 coordinate " ); double x1 = Double.parseDouble(strNumber); strNumber = JOptionPane.showInputDialog("Enter the value of y1 coordinate " ); double y1 = Double.parseDouble(strNumber);
My requirement is - I need to browse the folder and select multiples and upload all the selected files at once. note that here i need to use single browse button ONLY.
how to use the CTRL-D in my program. The program records the amount of times a positive and negative integer is typed. When the user decides to end the program, they will use the CTRL-D to terminate the program. After the button combination has been pressed, I spit out to the user the results. The problem is when I press CTRL-D the program just terminates and I can't even get it to read the next line of code. ....
im new to java and i wanna make a program using java that can add order entries for a restaurant but how to... i was hoping something that would ask to person to input one or two items and before it calculates the total amount to be paid it will ask the guy who inputs the amount whether or not there are additional orders or not before it prints out the total amount... I am pretty sure it will need an if-else statement..
import javax.swing.*; import java.util.Scanner; public class OrderCalc { JFrame.setDefaultLookAndFeelDecorated(true); JFrame aFrame = new JFrame("OrderCalc"); aFrame.setSize(500,250); aFrame.setVisible(true);
I have a web form with a field Department. I want to add Sub Departments(unknown number) of one Department and then further Sub Sub Departments(unknown number) of one Sub Department. How I will make a form and how I will add this data in attached database. I have one solution:
One Department field with a button to add any sub department if any. By clicking on button, a new row will be generated with another text field and new button. In this way, it will go on. Tree like structure.
But I have another solution, JSF Tree to add or delete entries on the run time. But the problem is that I am unable to find any example of JSF tree like structure populated from database and in which we can add or delete entries on run time and on the same time these entries may also be stored in database.
I have a database of peoples names linked up to a from to enter a new employee.The form has a previous and next button that should cycle through the employees alphabetically.What im doing the cycle by now is ID which isnt in alphabetical order and just goes by the order they where entered in.
Is there any way to cycle through alphabetically instead? Is running a query each time the next/previous button is pressed the correct way or should it just grab all the names in the array. Theres probably 150 names.
I have an editable JTable that has a lot of JComboBox's as cell entries. I would like to be able to "arrow over" to said cell, and with a pressing of either a numerical button or by typing the first letter of the String selection (possibly followed by a second), be able to select the appropriate selection from the cell's JComboBox. I have tried to add a key listener to the JComboBox itself, which works given that I click on said cell and show its menu.
How would I go about ensuring that, when focus is on the cell itself, and I start typing, the appropriate selection is chosen?? (I think this might get into key binding, but I don't know if I have to try it from the scope of JTable, or from that JTable's TableModel (which I have made my custom version of).
Here is what I have so far (everything but SandwichNumber, SandwichName, and Oregano uses JComboBox): [URL] ...., how would I do such key binding?
I think I'm about 90% complete with this program but I'm stuck on my adding entries method. It gives me a runtime error which says:
Enter the name: Bill Exception in thread "main" java.lang.NullPointerException at Phonebook.addEntry(Phonebook.java:70) at Phonebook.main(Phonebook.java:49)
Here is my code: /* * This program asks the user for input for a name, phone number and notes up * to 200 entries. It stores every contact in a file. Type 'h' for help while * running this program. */ import java.util.Scanner; import java.io.*;
Assignment: Develop a GUI-based program to read the entries of a matrix from a text file. The first number is the number of rows; the second number is the number of columns. The remaining numbers are integers between 1 and 9 in row by row order. Scan the matrix, highlight (display the entries in different color) all cells that form a group of five cells with the same value horizontally, vertically or diagonally.
Example of text(.txt) file: 7 7 3623161 3666669 3936293 3594955 3289867 2493998 1399998
Example of output: 3623161 3666669 3936293 3594955 3289867 2493998 1399998
* ^^this would be what it would look like when displayed in the GUI. But it would be colored. Anything that has 5 in a row ...My Class File:
EX. 0=black(when there is no combo. of 5)1=blue(horizantal combo of 5)2=red(vertical combo of 5)3=green(right diagnol combo of 5)4=purple(left diagol combo of 5)
I have a program for a phone directory. It needs to add, delete, append, and edit telephone records. I've gotten it to write and search the files. Just need to get it to delete and edit them.
I have a 2d array that i am manipulating. In my class i have a constructor that takes the dimensions of the array and within th econstructor i need to randomly fill the array. However, when i try to manipulate it in the test program, all that prints out are the default values.
here is the class
import java.util.*; import java.lang.Math; import java.util.Arrays; import java.util.Random; class SummerStats
[Code] .....
And here is the printout
Enter number of rows(people): 3 Enter number of columns(years): 3 Enter number of person to find sum salary: 1 Enter year to find Max salary of that year: 1 [] [] The max salary is at index: (0, 0, ) The largest salary ocurred in year: 0 The sum of person 1 is: 0.0 The total of all salaries is: $0.0 The max salary in year 1 is: 0.0 The average salaries for each year: 0.0, 0.0, 0.0,
The total salary for each person is recorded below.
And the last method called doesn't finish or printout ie the program doesnt end
I have a problem with this application , I have a button that allows users to delete entry's from the array list, but i've noticed when i go back and click display entry's the correct entry has not been deleted.....for example if i enter a,1,2 then b,1,2, then c,1,2 in fields, then delete c,1,2 when i actually go to display the data entered a,1,2 will be gone not the one i entered.
So it seems to be deleting the entry at index 0 of the array list no matter what and not the chosen item..Delete Button Code
private void deleteBtnActionPerformed(java.awt.event.ActionEvent evt) { if (numTf.getText().equals("") || nameTf.getText().equals("") || yearTf.getText().equals("")) { JOptionPane.showMessageDialog(null, "All fields must be full"); } else if (count == 0)
Write an interface Directory to manipulate entries in a telephone directory for the University. The interface must support the following operations:
1) The ability to insert new entries into the directory. Entries should be stored in alphabetical order of surname. 2) Delete entries from the directory either by name or number 3) Provide a lookup method that will find the extension no of a member of staff given his/her name. You should try to make this method run as efficiently as possible. 4) Change a person's telephone number 5) Print the telephone directory in a neatly tabulated fashion.
Write a class ArrayDirectory that implements this interface using an array to store the telephone directory information. The class must store the surname and initial for each member of staff and their telephone extension (a four digit number which may start with a zero). You may find it useful to define a class Entry to store information about individual entries. The entries should be read into the array from a text file consisting of multiple lines in the following format:
Surname<tab>Initials<tab>Telephone extension
Write a main program that reads in data from a file and then tests all the methods of your class interface. Note it is not necessary to write data back to disk (even if it has changed) in this project.
For data insertion and lookup, you should measure the performance for the average case (e.g. looking up a record in the middle of the data). To do this you can use the static method System.currentTimeMillis() which returns the time in milliseconds. To get an accurate measure of the time to perform an operation it is a good idea to perform each operation 1000 (or even 10000) times and measure the time taken. This will remove any problems due to the system clock having a coarse granularity (not ticking very often). Make sure you only time the method and not any input/output associated with it. Your documentation should include a discussion of these results.
Part 2
You decide that your solution to part 1 may be too slow to be useful when used with a real large telephone directory and make the following changes to attempt to improve the performance of your program:
1). Provide a second implementation (ListDirectory) of the Directory interface using the Java Collections List interface and LinkedList classes. 2). The changes in 1) should make adding, deleting and modifying records more efficientbut will probably reduce the time to lookup numbers. To overcome this you use a technique called hashing. Instead of storing all the records on one list you use a series of lists. The data for all people whose surname begins with "A" is stored on the first list, records for all people whose surname begins with "B" on a second list and so on. Write a third implementation (HashDirectory) of the Directory interface using this technique.
Again, you should measure the performance for the best, worst and average cases of implementations 1) and 2) above. Compare the efficiency of each of the 3 implementations in your documentation.
Part 3
Choose one of your 3 implementations from Parts 1 and 2 and embed it in a graphical user interface that allows users to perform all the methods in the Directory interface using a mouse and keyboard appropriately.
I am developing one form in jsf/primefaces. I have two inputText(inputMask) for e.g moble number and telephone number. I want to restrict the user to put only one of these two fields . That means if user starts putting value in mobile no. then telephone no. field should be disabled and if user starts putting value in telephone no. then mobile no. field should be disabled.
I have a class that extends JFrame, within that, i have set up JPanel where within that i have four JComboBoxes, I am to enable this JPanel and its JComboBoxes at the end of a method
The code for that method is:
private void tableNumberJComboBoxItemStateChanged() { // load data for table try { // get data for table myResultSet = myStatement.executeQuery("SELECT * FROM" + "restauranttables WHERE tableNumber = " + Integer.parseInt( selectedTableNumber));
[Code] ....
I am not sure how to enable this JPanel? I have another Jpanel to Disable but one question at a time i suppose.
I have a website which requires login. After I enter username and password and click login button, a new page is loaded. In that page I have a username in the right up corner. When the user clicks logout button, Session.Clear() method is called and also Response.Redirect(" to login page "). It works OK, but the problem appears when I then click Back button in the browser. It gets me back to previous page with the username in the right up corner. Insted, I would like to show message asking user to enter password again so he can login properly.
I want my jrame should not be resized when clicking on maximize button of window.and for this i have put setResizable(false)in the constructor of class which extends Jframe.
I am learning Java but have a strong C# background. I am trying to figure out the syntax to do this in Java. In C# I would do the following to enable all text boxes in a panel
private void EnableAll() { foreach (Control ctrl in Panel1.Controls) { if (ctrl is Textbox) ((Textbox)ctrl.Enabled = true; } }
Is there something similar I can do in Java to do the same thing.
I want to disable the read write execute permissions for the users on C:/ drive. i.e. to disable their Administrator rights. How can I do it using Java?
I'd like to enable/disable a jpanel and it's entire contents in one fell swoop. I could of course call each component's .setEnabled() method, but I figured there must be a better way!
