how public data member manipulated by outside world

[Abdullah mohammad]

please can some one give an example in which public data member of a class is manipulated by outside world
directly.

[Steve Luke]

The java.awt.Point class (see API) has two public data members, x and y. You can directly manipulate them like this:

Point p = new Point(7,2);  //new point with x= 7, y= 2
p.x= 45;
p.y = -4;

[Campbell Ritchie]

Welcome to the Ranch
Look up the java.awt.Point class. Or java.awt.GridBagConstraints.
Of course, it is usually regarded as poor design to have public fields, unless they are constants. Point and GridBagConstraints do not escape being bad.

[Abdullah mohammad]

Steve Luke wrote:The java.awt.Point class (see API) has two public data members, x and y. You can directly manipulate them like this:

Point p = new Point(7,2);  //new point with x= 7, y= 2
p.x= 45;
p.y = -4;

thank you Steve