Question

I am working with to complete a TrafficSystem class in Java by using BlueJ. I have stuck to answer this question below:

Write a private instance method cycleState() which takes no argument and
returns no value. This method cycles the value of state, from 1 to 2, from 2 to
3, from 3 to 4 and from 4.

Is there any body can help me to set cycleState() method to go from 1 to 2, then 2 to 3, then 3 to 4 and back to 1 again.

Answer 1

Source Code in Java:

class TrafficSystem
{
private int state; //class variable
TrafficSystem() //default constructor
{
state=1;
}
private void cycleState() //function to cycle state from 1 to 2, 2 to 3, 3 to 4 and 4 to 1
{
state++;
if(state==5) //if state exceeds 4, we make it 1
state=1;
}
//function to test the function above by cycling and printing states for a given number of times
void displayTraffic(int time)
{
for(int i=1;i<=time;i++)
{
System.out.println("State at time "+i+" is "+state);
cycleState();
}
}
public static void main(String args[])
{
TrafficSystem t=new TrafficSystem();
t.displayTraffic(10);
}
}

Output: