CODEWITHSUNDEEP
javaswingformattingjtable
Scuffed Newton
Scuffed Newton

Reputation: 87

How to format contents of a JTable

I am using a JTable to display numerical data and strings. The numerical data default formats to the right hand side of the JTable, and the strings format to the left. I want both to be formatted into the center of the cell. I am using Nedbeans to develop the GUI but it does not seem to help with this issue.

My attempt was to create a cell renderer class that overrides the JTable default cell renderer, but I don't know the line of code to actually change the formatting in the new cell renderer.

Any help would be appreciated.

Upvotes: 0

Views: 747

Answers (1)

YuTendo
YuTendo

Reputation: 339

Your thinking is correct. Within the custom TableCellRenderer, you can actually check which column/row/cell is rendered and subsequently assign a column/row/cell specific formatting.

 public static class CustomTableCellRenderer extends DefaultTableCellRenderer {    
        @Override
        public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
            DefaultTableCellRenderer c = (DefaultTableCellRenderer) super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);

            // center everything in the first column
            if (column == 0) {
                c.setHorizontalAlignment(JLabel.CENTER);
            }

            // the background and border of the first cell should be gray
            if (column == 0 && row == 0) {
                c.setBackground(Color.GRAY);
                c.setBorder(BorderFactory.createMatteBorder(0, 5, 0, 5, Color.GRAY));
            }

            return c;
        }
 }

Please note that the DefaultTableCellRenderer is called for each individual cell.

All available formatting functions are well described in the respective documentation: https://docs.oracle.com/javase/10/docs/api/javax/swing/table/DefaultTableCellRenderer.html

Upvotes: 1

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