CODEWITHSUNDEEP
javaswingjtabletablecellrenderer
Jannis Alexakis
Jannis Alexakis

Reputation: 1319

Alignment in a JTable cell

I am using the following DefaultTableCellRenderer to display currency in my tables. It works fine too, only problem I have is, the numbers in the columns I set this renderer on are aligned left, everything else is aligned right. I´d like to know why. 

public class DecimalFormatRenderer extends DefaultTableCellRenderer {

public static final DecimalFormat formatter = new DecimalFormat("#.00");

@Override
public Component getTableCellRendererComponent(
        JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
    value = formatter.format((Number) value);
    return super.getTableCellRendererComponent(
            table, value, isSelected, hasFocus, row, column);
}    
}

Upvotes: 0

Views: 1626

Answers (1)

MadProgrammer
MadProgrammer

Reputation: 347194

The default cell renderer used by JTable to render numbers set's it horizontal alignment to JLabel.RIGHT...

static class NumberRenderer extends DefaultTableCellRenderer.UIResource {
    public NumberRenderer() {
        super();
        setHorizontalAlignment(JLabel.RIGHT);
    }
}

You render will be using JLabel.LEADING by default (being based on a JLabel).

If you change your renderer to set the horizontal alignment in constructor, it should align to where you want it to go...

public class DecimalFormatRenderer extends DefaultTableCellRenderer {

    //...

    public DecimalFormatRenderer() {
        super();
        setHorizontalAlignment(JLabel.RIGHT);
    }

    //...
}

Upvotes: 2

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