swing - JTable cell listener JAVA -


need help me understand jtable cell listeners.

my problem need catch change in cell, when catches, need old value , new value.

the reason i'm asking i'm using jtable defaulttablemodel.

i saw other posts this, when i'm trying implement not "string" results, serialized results.

here i'm using: 

        table.addpropertychangelistener(new propertychangelistener() {          @override         public void propertychange(propertychangeevent evt) {              system.out.println(evt.getoldvalue());             system.out.println(evt.getnewvalue());         }      });

this 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

two approaches.

the first customize tablemodel , override setvalueat(...) method. basic code be:

@override public void setvalueat(object newvalue, int row, int column) {     object oldvalue = getvalueat(row, column);      // processing "oldvalue" , "newvalue"      super.setvalueat(...); }

the other approach use "listener" can add tablemodel. approach can table cell listener. class generate event whenever oldvalue/newvalue has been changed. event give access both values can processing.

depending on exact requirement can use either approach.


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