Accessing Variables From Array Instance Of Class?

I am having some problem accessing variables from an array instance of a class. Heres what i have done;

In the main class:

Example obj[]= new Example[4];

In the main class constructor:

obj[0] = new Example(0);
obj[1] = new Example(1);
obj[2] = new Example(2);
obj[3] = new Example(3);

In the main update() method:

if(condition)
//update

In the Example class constructor:

private boolean change = false;

In the Example class update() method:

if(x >20)
change= true;

Now, i want to access the variable change from the main class, how do i do it? The 'condition' in the if statement is the condition of wether the change variable ia true or false. How do i access it?