如何获取JTable中显示的单元格值（不是完整的TableModel值）？

Question

Normally, I get the value of a table cell in JTable using

table.getModel().getValueAt(rowIndex, columnIndex)

However, now I have a given input JTable (which I don't control or create) and need to get the displayed cell value as a String . If the value is a Double , it can have more digits than are displayed by the JTable .

Example: The JTable displays 0.37 (two digits) - but getValueAt returns 0.37234421

What I'm looking for is either get the displayed value as a String , or the # of digits displayed (so I can change the double from getValueAt accordingly()...

Answer 1

The brute force method would be

Object value = jtable.getValueAt(row, column);
Component component = jtable.getCellRenderer(row, column).getTableCellRendererComponent(jtable, value, isSelected, hasFocus, row, column);
if (component instanceof JLabel) {
    String displayedValue = ((JLabel) component).getText(); // here you are
}

Beware the CellRenderer of a JTable can be replaced by someone by calling eg jtable.setDefaultRenderer(columnClass, renderer) . Then, depending on the implementation, the resulting Component might not be a JLabel any more. In the latter case a different logic is needed to retrieve the displayed value (ie cast component to different Class and retrieve it from that instance). However the DefaultTableCellRenderer implementation which is used by JTable by default returns a JLabel .

BUT The value you see could be different from this as well .... if the column in the table is not wide enough in your table the text 23.4567 could be the text but the actually displayed text is 23.4... ... If you want to know the factually displayed value a different approach is needed...