Advertisements Why does my model update the JTable view even if I do not call the fireTableDataChanged() ? Is this normal behaviour? @Override public void updateGUI(GUIUpdateEvent obj) { System.out.println("updategui"); for (int i = 0; i < 8; i++) { for (int j = 0; j < 8; j++) { data[i][j] = obj.getBoard()[i][j].getCurrentPawnOnField().getChessIcon(); } } //fireTableDataChanged();… Read More fireTableDataChanged() java

Advertisements I am getting MQTT messages using a Java program and I am using Java swing to represent data. The problem is that I have to click a button to update jlabel in order to get new values. I am trying to do this automatically every time I get a new message. import org.eclipse.paho.client.mqttv3.MqttException; import… Read More Java update Label automatically every time an MQTT message arrives

Advertisements I am trying to create a RGB color pallete from HSB values (one color for each degree) in a Java SWING app. My problem is that Color.HSBtoRGB() returns the same value for every degree. I do not understand it. I searched the Internet and tried a number of examples that do not seem to… Read More How to create rgb colors from a range of HSB values

Advertisements I’ve been spending the past few hours trying to figure out how to use a panel in my GUI class from a class named algorithms. I know this question has been asked before, But I cant seem to figure out how to incorporate it into my code, so I would appreciate any form of… Read More How to add to a JPanel from another class

Advertisements I have created dynamic JChekboxes that is linked to a file. I want to see which ones are checked via an action listener. I have tried getSource(), I have tried getState() none of them are working… for (int f = 0; f < numberCheckBox[0]; f++) { String line1 = tableLines[f].toString().trim(); String[] dataRow1 = line1.split("/");… Read More How to check the state of a dynamically generated JCheckBox in an action listener

Advertisements This code right here is a button of a calculator that is when pressed shows "2" in the calculator’s textbox I was just curious why the first code allows me to enter number "2" just once while the second one allows me to enter the number "2" Many times, in other words, what does… Read More What is is the difference between these two codes?

Advertisements So I want to have a CardLayout class that switches between a menu page and a main app page, but I want to design those two panels in their own classes, then add an ActionListener and a CardLayout in a different class, and have the ActionListener use a button created in one of the… Read More Accessing JPanel components from a seperate class

Advertisements statement.executeUpdate("INSERT INTO LOGIN VALUES(" + jTextField1.getText() + ",’" + jTextField2.getText() + "’," + jTextField3.getText() + ")"); I have this line and I am trying to do this line prepared statement but I am not able to do it. What I did is this : PreparedStatement pstmt = con.prepareStatement("UPDATE Login SET login_id = ? WHERE… Read More Change a line to prepared statement