Hello and thanks for taking the time to deal with my problem. First let me introduce you to my dummy-/training-project. The classes listed below should represent a programm after the MVC-model (Model, View, Controller). When running the main class a FileChooser opens up, from which you're able to select a .csv-File that contains information that is saved as a String[][]. This String[][] is then visualized in the view-class as a JTable. This JTable is part of a JPanel inside a JFrame with the BorderLayout.CENTER. Now to the question, why wont my JTable resize properly if i am rezising the JFrame? I searched on the internet and even this.table.setAutoResizeMode(JTable.AUTO_RESIZE_ALL_COLUMNS); will not effect the resizing at all. I hope you can help me somehow. Thanks!
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Scanner;
/**
* This class is responsible for the actual data being "processed".
* It saves the Strings out of a File into a String[][] and further more updates its content,
* if changed by the View-Class.
*
* @author CodeScrub
* @version 2022-01-13
*/
public class Model {
private File selectedFile;
private String[][] dataSetTotal;
private ArrayList<String> dataSetList;
private ArrayList<String> tableDatasetList;
public Model() {
dataSetList = new ArrayList<String>();
tableDatasetList = new ArrayList<String>();
}
public void evaluateData() {
try {
Scanner scanner = new Scanner(this.selectedFile);
while(scanner.hasNextLine()) {
String data = scanner.nextLine();
dataSetList.add(data);
}
scanner.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
this.dataSetTotal = new String[dataSetList.size()][3];
for(String info : dataSetList) {
String[] dataSetSeperate = info.split(";");
for(int i = 0; i < dataSetSeperate.length; i++) {
dataSetTotal[dataSetList.indexOf(info)][i] = dataSetSeperate[i];
}
}
}
public void setSelectedFile(File selectedFile) {
this.selectedFile = selectedFile;
}
public File getSelectedFile() {
return this.selectedFile;
}
public String[][] getDataSetTotal(){
return this.dataSetTotal;
}
public void updateData(String[][] tableContent) {
for(int i = 0; i < tableContent.length; i++) {
String dataSetSeperate = "";
for(int j = 0; j < tableContent[i].length; j++) {
if(j < 2) {
dataSetSeperate = dataSetSeperate + tableContent[i][j] + ";";
}else {
dataSetSeperate = dataSetSeperate + tableContent[i][j];
}
}
this.tableDatasetList.add(dataSetSeperate);
}
try {
BufferedWriter writer = new BufferedWriter(new FileWriter(this.selectedFile));
for(String info : this.tableDatasetList){
writer.write(info + "\n");
}
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
this.tableDatasetList = new ArrayList<String>();
}
}
import java.awt.Dimension;
import javax.swing.*;
import javax.swing.filechooser.FileNameExtensionFilter;
/**
* This class visualizes the processed data inside a JFrame.
* The data sets are visualized as a JTable.
*
* @author CodeScrub
* @version 2022-01-13
*/
public class View extends JFrame{
private static final long serialVersionUID = 1L;
private JFileChooser chooser;
private FileNameExtensionFilter filter;
private JLabel firstName;
private JLabel lastName;
private JLabel socialSecurityNumber;
private JButton buttonSafeChanges;
private JScrollPane scrollPane;
private JTable table;
private JPanel centerPanel;
private Controller controller;
public View(Controller controller) {
this.controller = controller;
init();
}
private void init() {
this.chooser = new JFileChooser();
this.filter = new FileNameExtensionFilter(
"CSV Files", "csv");
this.chooser.setFileFilter(filter);
this.chooser.setPreferredSize(new Dimension(800,500));
int returnVal = chooser.showOpenDialog(this);
if(returnVal == JFileChooser.APPROVE_OPTION) {
this.controller.updateData(chooser.getSelectedFile());
this.controller.evaluateData();
this.firstName = new JLabel("First Name");
this.lastName = new JLabel("Last Name");
this.socialSecurityNumber = new JLabel("Social Security Number");
this.centerPanel = new JPanel(new BorderLayout());
String[] title = {firstName.getText() , lastName.getText() , socialSecurityNumber.getText()};
this.table = new JTable(this.controller.getDataSetTotal(), title);
this.table.setAutoResizeMode(JTable.AUTO_RESIZE_ALL_COLUMNS);
this.centerPanel.add(table, BorderLayout.CENTER);
this.scrollPane = new JScrollPane(this.table);
this.centerPanel.add(scrollPane, BorderLayout.EAST);
this.buttonSafeChanges = new JButton("Safe Changes");
this.buttonSafeChanges.addActionListener(controller);
this.centerPanel.add(table.getTableHeader(), BorderLayout.NORTH);
this.add(centerPanel,BorderLayout.CENTER);
this.add(buttonSafeChanges, BorderLayout.SOUTH);
this.setTitle("MVC");
this.setSize(475,350);
this.setMinimumSize(new Dimension(475,350));
this.setLocationRelativeTo(null);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.setVisible(true);
getTableContent();
}else {
System.exit(0);
}
}
public JButton getButtonSafeChanges() {
return this.buttonSafeChanges;
}
public String[][] getTableContent() {
String[][] tableContent;
tableContent = new String[this.table.getRowCount()][this.table.getColumnCount()];
for(int i = 0; i < table.getRowCount(); i++) {
for(int j = 0; j < table.getColumnCount(); j++) {
tableContent[i][j] = table.getValueAt(i,j).toString();
}
}
return tableContent;
}
}
import java.io.File;
/**
* This class works as an interface between the view- and model-class
* and also handles the action performed after the button press "Safe Changes".
*
* @author CodeScrub
* @version 2022-01-13
*/
public class Controller implements ActionListener{
private View view;
private Model model;
public Controller() {
this.model = new Model();
this.view = new View(this);
}
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource() == this.view.getButtonSafeChanges()) {
this.model.updateData(this.view.getTableContent());
}
}
public void updateData(File selectedFile) {
this.model.setSelectedFile(selectedFile);
}
public File getSelectedFile() {
return this.model.getSelectedFile();
}
public void evaluateData() {
this.model.evaluateData();
}
public String[][] getDataSetTotal(){
return this.model.getDataSetTotal();
}
}
public class MVC_Testclass {
public static void main(String[] args) {
Controller controller = new Controller();
}
}
Basically, as you are using JScrollPane container for your JTable, you only need to add the scrollPane in your centerPanel, and make sure to add it in the CENTER. The below resolves the issue in your code.
this.table.setAutoResizeMode(JTable.AUTO_RESIZE_ALL_COLUMNS);
//this.centerPanel.add(table, BorderLayout.CENTER);
this.scrollPane = new JScrollPane(this.table);
this.centerPanel.add(scrollPane, BorderLayout.CENTER);