CODEWITHSUNDEEP
javaswingjtable
Ervinas34
Ervinas34

Reputation: 133

JTable cell listener JAVA

Need some help to help me understand about jtable cell listeners.

My problem is that i need to catch a change in cell, when it catches, i need to get old value and new value.

The reason i'm asking is that i'm using JTable with DefaultTableModel.

I saw other posts about this, but when i'm trying to implement i do not get any "String" results, only serialized results.

Here is what i'm using: 

        table.addPropertyChangeListener(new PropertyChangeListener() {

        @Override
        public void propertyChange(PropertyChangeEvent evt) {

            System.out.println(evt.getOldValue());
            System.out.println(evt.getNewValue());
        }

    });

this is what i get:

null
javax.swing.JTable$GenericEditor@4b20aa93
javax.swing.JTable$GenericEditor@4b20aa93
null
null
javax.swing.JTable$GenericEditor@4b20aa93
com.apple.laf.AquaImageFactory$SystemColorProxy[r=255,g=255,b=255]
com.apple.laf.AquaImageFactory$SystemColorProxy[r=0,g=0,b=0]
com.apple.laf.AquaImageFactory$SystemColorProxy[r=9,g=80,b=208]
com.apple.laf.AquaImageFactory$SystemColorProxy[r=202,g=202,b=202]
null
false
com.apple.laf.AquaImageFactory$SystemColorProxy[r=0,g=0,b=0]
com.apple.laf.AquaImageFactory$SystemColorProxy[r=255,g=255,b=255]
com.apple.laf.AquaImageFactory$SystemColorProxy[r=202,g=202,b=202]
com.apple.laf.AquaImageFactory$SystemColorProxy[r=9,g=80,b=208]
false
true
com.apple.laf.AquaImageFactory$SystemColorProxy[r=255,g=255,b=255]
com.apple.laf.AquaImageFactory$SystemColorProxy[r=0,g=0,b=0]
com.apple.laf.AquaImageFactory$SystemColorProxy[r=9,g=80,b=208]
com.apple.laf.AquaImageFactory$SystemColorProxy[r=202,g=202,b=202]
true
false

Upvotes: 1

Views: 2585

Answers (1)

camickr
camickr

Reputation: 324098

Two approaches.

The first is to customize the TableModel and override the setValueAt(...) method. The basic code would be:

@Override
public void setValueAt(Object newValue, int row, int column)
{
    Object oldValue = getValueAt(row, column);

    // do processing with your "oldValue" and the "newValue"

    super.setValueAt(...);
}

The other approach is to use a "listener" that you can add to any TableModel. For this approach you can the Table Cell Listener. This class will generate an event whenever the oldValue/newValue has been changed. The event will give you access to both values so you can do your processing.

Depending on your exact requirement you can use either approach.

Upvotes: 1

Related Questions