I have created Jtable which stores images and Strings, I can SAVE the content to external file, however whenever I will try to load it back (below code) to JTable, it throws me an error. One field in the JTable uses renderer for images, and the code throws everything back as a String ) how can I transform one 'word' (e.g. /usr/etc/test.jpg) in a text file to ImageIcon which will be handeled by the renderer? Should I read the file 'word' by 'word' store it as array and load it into column?
We haven't covered BufferedReader in this course yet. The assignmen is to get user input to fill arraylist with strings then when user hits Enter without any input, the console displays the contents of the arraylist.
import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.util.ArrayList; public class Ex01 { public static void main(String[] args) throws IOException {
public static final String FILENAME="BinarySearchTree.txt"; .... public BinarySearchTree(TNode r) throws IOException { root = r; textfile = new File(FILENAME); fw = new FileWriter(textfile.getAbsoluteFile()); bw = new BufferedWriter(fw); br = new BufferedReader(new FileReader(FILENAME));
[code].....
In the constructor I create the BufferedReader using the FileReader and path to the input text file(in same dir as this project). When I am done reading I close it. In the debugger it is unable to read a single line, then goes to close the file.
I am having problems in creating an age calculator in java. The only input is your name and date of birth. It means I need to incorporate the current date and make conditions. I am only allowed to use BufferedReader, InputStreamReader and IOException for import. I need to start with this and just add the conditions,
import java.io.InputStreamReader; import java.io.IOException; import java.io.BufferedReader; public class ageactivity { public static void main (String[] args) throws IOException { BufferedReader br = new BufferedReader (new InputStreamReader (System.in));
[code]...
I tried to add conditions but its not calculating the days.
I am having trouble adding numbers read from a file with BufferedReader, using Tokenizer to split the numbers up by " " - space and adding them to an adjacency matrix.Below is the text file and my code, that I have at the moment.
I'm trying to write a program to read the names off of email addresses in a text file and my code is not printing anything to the console. So I want to print everything before the "@" sign. It seems like I'm missing a big thing
import java.io.BufferedReader; import java.io.File; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.IOException; import java.util.Scanner; public class Email { public static void main(String[] args) throws FileNotFoundException, IOException {
I need to compare two jtable and set the value from one jtabel to the other jtable.
jtable one consist of:
Unit ID Unit Name Access
ABC, Inc ABC Incorporate (checkbox) value = uncheck
CDE, Inc CDE Incorporate (Checkbox) value = uncheck
jtable two consist of:
Unit ID Access
ABC, Inc ABC Incorporate (checkbox) value = checked CDE, Inc CDE Incorporate (Checkbox) value = checked
if comparing jtable one an jtable two has the same Unit ID then colum Access from jtable two value is set to jtable one become check based on jtable two.I did the code but did not work:
for (i = 0, jTable1.getrowcount(), i++) { for (j = 0, jTable1.getrowcount(), j++) { if (jTable1.getvalueAt(i,0) == jTable2.getvalueat(j,0)) { jTable1.setvalueat(true,i,2) } } }
How to get value from jTable? I use mouse click event for my jtable and then, i want to set value to datechooser. Usually my behaviour for get value from jTable to Textfield, i'm using this method.
I have created a JTable which does not display. When I run the program I can see that a line appears around the edge of the panel indicating the JScrollPane is added to MyJPanel, however, the table is missing. This is the table
public class MyJTable extends JTable { private Object[][] data; private Object[] columns; private MyTableModel model = new MyTableModel(data, columns); public MyJTable(Object[] columns, ArrayList<Data> data) { this.columns = columns; for(Data d:data){
In a spreadsheet, alphabetical letters are column names and numbers represent rows. I have named the columns and I need to name the rows in the same way. Or if I am to set the first column in every row as row headers, how can I make then non-editable by the user? In addition to that, how can I make the table appear bigger? There's a lot of space but the table appears to be small.
My JTable has a row, row number 0, which I always want to be at the top.I tried the following two approaches, both without success:
1- Use a custom table cell renderer for the header, and create a header of two rows. the second row is my JTextField.
Problem: I cannot get the JTextField to function properly. (I've seen examples with a checkbox in the header, but that one just reacts to a click somewhere on the header, my textfield must be editable).
2- Use the first row of the table. This works quite nice. However, I must prevent row 0 to be re-ordered when sorting the table.
I was thinking to add a prefix (either something like "___" or "zzz" depending on current sorting mode), but I do not know which methods to adjust for this exaclty.
Another approach would be to have N textfields above the JTable in some layout (or two JTable's on top of each other).
However, Then I would need to react to the re-ordering and re-sizing of all columns as well, which does not seem easy to me.
I have encountered a very tricky spot in a project that i am working on. I must have a JTable to programmatically select the very last row in an AbstractTableModel. I have tried every thing but nothing works so far.
The problem is is that the JTable only scrolls down to the second last table row in the model? What am i missing?
//Show the very last row in a tablemodel object using the method updateTableRows //after an "insert action event" occurred public void updateViewMode(String name, java.util.List<NetworkSwitch> list, boolean flag) { CableTableModel model = cableTable.getCableModel();
[code]....
What happens is that the only row that gets selected is the second last row of the total rows iny AbstractTableModel object, "CableTableModel"
I am preparing a small solution. Below is how the functionality works.
1. Login Screen 2. Successful Login will take to a MDI Form 3. Click the menu, a JInternalFrame will open in the JDestopPane. 4. JInternalFrame has a JTable. 5. JInternalFrame has a JButton available for adding new data. 6. When JButton is clicked, a new JInternalFrame is popped up with some JTextField and JButton to save the data. 7. After saving the data (after insert query), a JDialog is opened to upload Logo (update query for BLOB), There are two buttons in the JDialog, one is for uploading the image, another one is uploading it later. 8. The logo is displayed in the JDialog and if the JButton, for upload is pressed, update the database and reload the JTable in the JInternalFrame is called.
My challenge is in point 8. The function is called properly, but the table is not getting refreshed.
JButton in JDialog for uploading the Logo private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: JOptionPane.showMessageDialog(this, "Image Uploaded Successfully"); companyConfig cc = new companyConfig(); //cc.reloadTable(); cc.updateTable(); this.dispose();
I have a panel which has set to cardLayout and at the bottom, I have the buttons, based on the button clicked I will change my cards further and back. My second card has Jtable which allows the user to edit a particular cell. Now my problem is for the first time, when the data is inserted into the table, the particular column's cell is getting editable and allowing user to edit the cell and take the value what user gives. But when I come from 3rd card to the 2nd card, I have to show the previous created table or again from my 1st card if I move to the second card (in the same opened application), the cell's in the jtable is getting editable but not allowing the user to enter the text to the cell?? why is this problem coming?? I tried repainting that table when I move from 3rd card to 2nd card, and when coming from 1st to 2nd card the jtable rows are removed and new rows are inserted. But still the same problem arrives?? why is it working correctly in the first time and not able to in the second time??
I've been creating a jTable where I can add / edit /delete new entries. Now i have 2 Questions :
1) My column 0 is filled with the row-number. I created a variable and with each "add" it adds +1 to the variable. That works, but as soon as i delete 1 row there is a gap ( 1..2..4..5..).
My question: Is there another way then mine to handle this?
2) The table is/should be working as some kind of database. The user is able to add Information (height, width,...). Now I want to sum the entries of 1 column (length,...). But as they´re objects I didn´t find a way.
My question: How can I sum the entries of 1 column of a table?
How do i parse a String of text in a JTable Cell to work as a button?For example lets say a row of IDs such as 1,2,3,4,5,6 id like the whole column to parse as JButtons that are titled 1,2,3,4,5,6..Id like to then use these buttons to call a function with the title as a parameter.Its just a simple row of entries where the button will open up an edit screen to edit the corresponding clicked entry.So how do i parse them as buttons for a start?
I am trying to create a JTable and I want to implement an undo option in it. Is it possible that I store the table model at some part of the operation and later when i press an undo button or something, I can set the saved table model so that it will perform like an undo.
I want to build a class that takes a JTable and previews on screen how it will be printed on the default printer. This is what we use to call as "Print Preview", just like MS Word, Excel, etc.
As we already know Java does not support this functionality out-of-the-box.
Based on some examples I've found googling I built two classes. The first one TestPreview.java justs shows the JTable and the second one PrintPreview.java previews how the JTable will be printed on the printer.
I have two buttons to go through the pages, "PREV" and "NEXT" and "Print' button to print the JTable. My problem is that when my JTable has too many rows and spans in more than one page PrintPreview does not work. It shows the same page again and again. Also, it does not show the entire JTable data, but only some of them and I can't figure out why.
I have a jTable with two columns and in the second Column I would like to have 2 different cell-renderer. One is String and the other one is boolean. The data is always from type Object[][]. I have written an own renderer:
Java Code:
@Override public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) { if(column == 2 && row > 2){ return super.getTableCellRendererComponent(table, (boolean)value, isSelected, hasFocus, row, column); } return super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column); //To change body of generated methods, choose Tools | Templates. } mh_sh_highlight_all('java');
So the problem is, that my JTable will always renderer to String. I thought when i write "(boolean)" before "value" (in my IF-Statement), he returns the boolean cell renderer. But it isn't doing that.
How can I return a boolean-renderer in my column 2 with all rows higher than 2 ?
