Public Class Example
{
public static Integer a;
public integer b;
public Example()
{
a=10;
b=10;
}
public void add()
{
a=a+10;
b=b+10;
System.debug('a value is '+a);
System.debug('b value is '+b);
}
}


in the anonymous class

Example e1= new Example();
e1.add();
Example e2= new Example();
e2.add();


what is use of static keyword???????????