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  1. #1
    shy_ted is offline Member
    Join Date
    Sep 2010
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    Default looping around a table renderer, is it possible?

    i am trying to get rows to change colours, red, green or white. Depending on whether the value in the cells has increased or decreased etc.

    I have it on a loop that currently prints out the previous, current value, and if its increased or not. As it stands i just have a value inserting into a cell but not updating a colour.

    the code i have for the timer and method that updates the cell and compares values is...

    Java Code:
    private void updateStockPrices() {
            for (int i = 0; i < stockBeans.size(); i++) {
                Object obj1 = getData(jTable, i, 1);
                String obj2 = obj1.toString();
                float newVal = Float.parseFloat(obj2);
                StockBean currentBean = stockBeans.get(i);
                final StockBean currentStockBean = stockTickerDAO.refreshStockInfo(currentBean);
                tableModel.setValueAt(currentStockBean.symbol, i, 0);
                tableModel.setValueAt(currentStockBean.price, i, 1);
                tableModel.setValueAt(currentStockBean.change, i, 2);
                float stock = currentStockBean.price;
                System.out.println("Comparing " + stock + " and " + newVal);
                if (stock > newVal) setData("INCREASE", i, 3);
                if (stock < newVal) setData("DECREASE", i, 3);
                if (stock == newVal)setData("NO CHANGE", i, 3);
    The table renderer code is..

    Java Code:
      JeksTable jTable = new JeksTable(tableModel){
            public Component prepareRenderer
                      (TableCellRenderer renderer,int Index_row, int Index_col) {
            Component comp = super.prepareRenderer(renderer, Index_row, Index_col);
            if (Index_row % 1 == 0 && isCellSelected(Index_row, Index_col)) {
            else {
            return comp;
    Can i have 3 different renderers and call the appropriate one each time the above if statements are run?

    or does anyone have a more simple solution?


  2. #2
    DarrylBurke's Avatar
    DarrylBurke is offline Forum Police
    Join Date
    Sep 2008
    Madgaon, Goa, India
    Rep Power


    1. By convention, Java variable names (that includes method and constructor parameters) start with a lowercase letter. More on
    Code Conventions for the Java(TM) Programming Language: Contents

    2. Do you know what the modulo operator % does? What's the remainder when you divide an int by 1?

    3. We have no idea of the functionality of the class JeksTable.

    Can i have 3 different renderers and call the appropriate one each time the above if statements are run?
    You don't *call* a renderer. You can set different renderers to different columns, and you can return different components from the getTableCellRendererComponent(...) method.

    To get better help sooner, post a SSCCE (Short, Self Contained, Compilable and Executable) example that demonstrates the problem.

    Last edited by DarrylBurke; 10-14-2010 at 02:51 PM.

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