Jtable Duplicate Values in Row

JTable duplicate values in row

Here's a complete example that may prove helpful. As the sample Map is unmodifiable, I refer you to @mKorbel's example on how to override isCellEditable() and setValueAt().

import java.awt.EventQueue;
import java.awt.GridLayout;
import java.util.Map;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;

/** @see https://stackoverflow.com/questions/9132987 */
public class EnvTableTest extends JPanel {

    public EnvTableTest() {
        this.setLayout(new GridLayout());
        this.add(new JScrollPane(new JTable(new EnvDataModel())));
    }

    private static class EnvDataModel extends AbstractTableModel {

        private Map<String, String> data = System.getenv();
        private String[] keys;

        public EnvDataModel() {
            keys = data.keySet().toArray(new String[data.size()]);
        }

        @Override
        public String getColumnName(int col) {
            if (col == 0) {
                return "Key";
            } else {
                return "Value";
            }
        }

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

        @Override
        public int getRowCount() {
            return data.size();
        }

        @Override
        public Object getValueAt(int row, int col) {
            if (col == 0) {
                return keys[row];
            } else {
                return data.get(keys[row]);
            }
        }
    }

    private void display() {
        JFrame f = new JFrame("EnvTableTest");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(this);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                new EnvTableTest().display();
            }
        });
    }
}

update values if duplicate in JTable

There are a lot of ways to do this. The best ones involve a clean separation between the data model (a list of stocks with amounts) and the table model (an adapter to express that in a way JTable understands).

Start with a List<StockHolding> where StockHolding is a super-simple class you make to hold the data for one row.

public class StockHolding {
  private String product;
  private int quantity;
}

(add in the constructor and getProduct/getQuantity)

Now when you enter a new product+amount...

addRequest(String product, int amount) {
  StockHolding holding = findInList(product, myList);
  if (holding == null) {
    myList.add(new StockHolding(product, amount));
  } else {
    holding.setQuantity(amount+holding.getQuantity());
  }

The key to making this work is to express your table model in terms of this list. getRowCount() returns myList.size() and the cell values are getValue(myList.get(rowNum), columnNum) where getValue() maps the column number to product or amount respectively.

This important lesson here is that isolating the express-as-a-table problem from the store-data problem make each problem easier to solve.

Create a way to stop to many duplicate values coming up in a JTable

Go through the TableModel counting the yes value from the last column. After that compare the counter with 8 and show the message if necessary.

Like this (is not tested)

public void checkCount(TableModel model) {
  int count=0;
  for (int row=0; row<model.getRowCount(); row++) {
    if ("Yes".equals(model.getValueAt(row, 3)) {
        count++;
    }
  }
  if (count>8) {
    JOptionPane.showMessageDialog(null, "Please remove a athlete from the team");
  }
}

Prevent adding duplicate data into JTable in Java

You can try this,

        java.lang.reflect.Type listType = new TypeToken<ArrayList<BDetails>>() {
                }.getType();

        List<BDetails> bList = new Gson().fromJson(json, listType);

        DefaultTableModel model = (DefaultTableModel) pTable.getModel();
        model.setRowCount(0);

        for( BDetails adr : bList) 
        {

            Vector<String> row = new Vector<String>();
            row.add(detail.getUserName());
            row.add(detail.getFirstName());
            row.add(detail.getLastName());
            row.add(detail.getAddress();
            model.addRow( row );
        }

model.setRowCount(0) will clear all the rows before inserting data. It worked for me.

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