Incrementar em um

class AddOne {
    public static void main(String[] args) {
    	
        int age = 30;
        int days = 20;
        System.out.println("I'm " + age + " today.");
        
        // Increase the age by 1
        ____;
        
       	// Decrease the days by 1
       	____;
        
        System.out.println("But I'll be " + age + " soon!");
        System.out.println("Only " + days + " to go!");
    }
}