CODEWITHSUNDEEP
java
Box
Box

Reputation: 113

How do I call for loop into table data?

I have a code where I am getting data when I input values say itr.get(0),str.get(0)etc... But I want to create a for loop to it but I cannot use it since its inside model.addRow

And also each one is of different size array list object(itr,str,dub).

How do I input data through for loop to it so I don't have to call it manually.

    public Data1()
{
    super();
    setDefaultCloseOperation(EXIT_ON_CLOSE);

    JTable table = new JTable(new DefaultTableModel(new Object[]{"Integers", "RealNumbers","OtherTokens"},5));
    DefaultTableModel model = (DefaultTableModel) table.getModel();

        model.addRow(new Object[]{itr.get(0),dub.get(0) ,str.get(0) });
        model.addRow(new Object[]{itr.get(1),dub.get(1) ,str.get(1) });
        model.addRow(new Object[]{itr.get(2),dub.get(2) ,str.get(2) });
        model.addRow(new Object[]{itr.get(3), ""  ,str.get(3) });
        model.addRow(new Object[]{itr.get(4), ""  ,str.get(4) });
        model.addRow(new Object[]{"", ""  ,str.get(5) });

    table.setPreferredScrollableViewportSize(new Dimension(500,80));
    JScrollPane pane = new JScrollPane(table);
    getContentPane().add(pane,BorderLayout.CENTER);

}

Upvotes: 1

Views: 298

Answers (1)

KevinO
KevinO

Reputation: 4403

The original question asked about adding in a loop to a table. However, the real problem is not the loop per se but rather the fact that there are a different number of elements of different types. This answer takes some data that was presented in the chat, and puts it into arrays. It could be read out of a file. It solves the question of what to put in a given row when there is no data by placing an empty String in the array.

The approach is to use the TableModel rather than attempting to add in a single shot. However, one could construct the necessary array if desired and pass it to the constructor instead. However, the TableModel is a better approach in the long run, IMHO.

public static void main(String[] args)
{
    // these three arrays represent the test data otherwise read
    //  from a file
    int[] ia = { 1493, -832722, 0, 1, 162 };
    double[] da = { 0.4, -6.382, 9.0E-21 };
    String[] sa = { "The", "fox", "jumped", "over", "the", "dog!"};


    Object[] columnNames = { "Int", "Real", "Tokens" };


    DefaultTableModel dm = new DefaultTableModel(columnNames, 0);
    JTable tbl = new JTable(dm);

    // while reading for a file, would know the max length in
    // a different way
    int loopCtr = Math.max(ia.length, da.length);
    loopCtr = Math.max(loopCtr, sa.length);

    // loop for the longest entry; for each entry decide if there
    // is a value
    for (int i = 0; i < loopCtr; ++i) {
        Integer iv = (i < ia.length ? ia[i] : null);
        Double dv = (i < da.length ? da[i] : null);
        String sv = (i < sa.length ? sa[i] : "");

        //add the row; if no value for a given entry, use an empty
        // String
        dm.addRow(new Object[]{(iv != null ? iv : ""),
                (dv != null ? dv : ""),
                sv});
    }

    //just output for the moment
    int cols = dm.getColumnCount();
    int rows = dm.getRowCount();
    StringBuilder sb = new StringBuilder();
    for (int row = 0; row < rows; ++row) {
        sb.setLength(0);
        for (int col = 0; col < cols; ++col) {
            sb.append(dm.getValueAt(row, col));
            sb.append("\t");                
        }

        System.out.println(sb.toString());
    }
}

The output demonstrates a table with blanks as needed.

1493        0.4       The       
-832722     -6.382    fox       
0           9.0E-21   jumped        
1                     over      
162                   the       
                      dog!

Upvotes: 1

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