CODEWITHSUNDEEP
javaswingjtable
tmn
tmn

Reputation: 11539

How does a JTable handle a null value?

When JTable invokes getValueAt() and that method return a null value, does it blow up? Or does it just show an empty string ""?

I ask because I've been returning an "" as null, but I'm trying to be more explicit with my getClass() method and "" can clash with nonstring types.

Upvotes: 0

Views: 1160

Answers (1)

tenorsax
tenorsax

Reputation: 21223

It depends how the value is rendered. It is up to a particular renderer to draw the actual data. See Concepts: Editors and Renderers for more information.

For example, DefaultTableCellRenderer that extends JLabel treats null like this: 

protected void setValue(Object value) {
    setText((value == null) ? "" : value.toString());
}

So, null is interpreted as an empty string.

Upvotes: 5

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