Object Array returning null values? - Java

I've declared this in Java:

private JToggleButton[] zarObj;

Then on the class constructor filled the array:

this.zarObj = new JToggleButton[]{zar1, zar2, zar3, zar4, zar5};

I need to use zarObj[i] to apply the setIcon method like so in a for loop:

zarObj[i].setIcon(var);

But I'm getting the nullPointerException. And when trying to access the objects:
for (int i=0; i<5; i++) { System.out.println(zarObj[i]); I get 5 null messages in the console.

Answer

You need to initialize those JToggleButtons before calling setIcon() on them:

for (int i=0; i < zarObj.length; i++) {
    zarObj[i] = new JToggleButton(params);
    zarObj[i].setIcon(var);
}