gistfile1.java

public class IncrementExample {
    private static final int startingNumber = 64;
    private static int currentNumber = startingNumber;

    public static final int CONSTANT = getNextNumber();

    private static int getNextNumber() {
        return currentNumber++;
    }
}

public class RandomItem extends Blah {
    
    public void onRightClick(Blah blah){
        player.openGui(IncrementExample.CONSTANT);
    }
    
}