CODEWITHSUNDEEP
javaswingarraylistjtableabstracttablemodel
Alexandre Huard
Alexandre Huard

Reputation: 23

Create JTable from ArrayList

Now that I managed to put the objects from a file into a ArrayList, I have to display them into a JTable.

These are the 3 objects contained in my ArrayList

Lieu<Double, String>(45.573715, -73.900295, "p1");
Lieu<Double, String>(45.573882, -73.899748, "p2");
Lieu<Double, String>(45.574438, -73.900099, "p3");

In the Lieu class I have the methods getX() and getY()

But I can't figure out how to diplay them in a JTable.

Longitude           Latitude
45.573715           -73.900295
45.573882           -73.899748
45.574438           -73.900099

Here's what I have for a start:

public class MonModel extends AbstractTableModel{

    @Override
    public int getColumnCount() {
        return 2;
    }

    @Override
    public int getRowCount() {
        return l.size();//l is the arraylist that contains the 3 elements
    }

    @Override
    public Object getValueAt(int rowIndex, int columnIndex) {
        if(columnIndex==0){
            return l.get(rowIndex).getX();
        }
        else if(columnIndex==1){
            return l.get(rowIndex).getY();
        }
        return null;
    }

Upvotes: 0

Views: 11126

Answers (2)

Amarnath
Amarnath

Reputation: 8855

Use a TableModel for showing data in the JTable. For Example:

In UI class, set the table model to the table.

JTable table = new JTable(new MonModel());

Table Model class

class MonModel extends AbstractTableModel {

    private List<LatNLon> l;
    private String[] columnNames = {"Longitude", "Latitude"};

    public MonModel() {
        l = new ArrayList<LatNLon>();

        l.add(new LatNLon("45.573715", "-73.900295"));
        l.add(new LatNLon("45.573715", "-73.900295"));
        l.add(new LatNLon("45.573715", "-73.900295"));
    }

    @Override
    public String getColumnName(int column) {
        return columnNames[column];
    }

    public int getColumnCount() {
        return 2;
    }

    public int getRowCount() {
        return l.size();
    }

    public Object getValueAt(int rowIndex, int columnIndex) {
        if(columnIndex==0){
            return l.get(rowIndex).getX();
        }
        else if(columnIndex==1){
            return l.get(rowIndex).getY();
        }
        return null;
    }
}

Latitude and Longitude class.

class LatNLon {
    private String x;
    private String y;

    public LatNLon(String x, String y) {
        this.x = x;
        this.y = y;
    }
// Code: For Getters and Setters.
}

Also read How to use Tables.

Upvotes: 1

trashgod
trashgod

Reputation: 205775

Use your TableModel to create a JTable and add it to a JFrame. Also consider overriding getColumnName(), as shown here. See also How to Use Tables.

MonModel model = new MonModel();
JTable table = new JTable(model);
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(new JScrollPane(table), BorderLayout.CENTER);
f.pack();
f.setLocationByPlatform(true);
f.setVisible(true);

Upvotes: 1

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