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How to do something every 2 minutes and know which 2 minute interval I have

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Consider the following code:

package sim;

import common.*;

public class TrafficLightTester {
	public static void main(String [] args) {
//		create 4 lights
		Light north = new Light(STATE.GO);
		Light south = new Light(STATE.GO);
		Light east = new Light(STATE.STOP);
		Light west = new Light(STATE.STOP);
//		Create 6 STATE arrays
		STATE[] s1 = {STATE.GO, STATE.GO, STATE.STOP, STATE.STOP};
		STATE[] s2 = {STATE.AMBER, STATE.AMBER, STATE.STOP, STATE.STOP};
		STATE[] s3 = {STATE.STOP, STATE.STOP, STATE.LEFT, STATE.LEFT};
		STATE[] s4 = {STATE.STOP, STATE.STOP, STATE.GO, STATE.GO};
		STATE[] s5 = {STATE.STOP, STATE.STOP, STATE.AMBER, STATE.AMBER};
		STATE[] s6 = {STATE.LEFT, STATE.LEFT, STATE.STOP, STATE.STOP};
		int count =  -1;
		count++;
		if (count == 0 ) {
			north.setLightState(s1[0]);
			south.setLightState(s1[1]);
			east.setLightState(s1[2]);
			west.setLightState(s1[3]);
			System.out.println("North");
			north.showLight();
			System.out.println("South");
			south.showLight();
			System.out.println("East");
			east.showLight();
			System.out.println("West");
			west.showLight();
		}
		if (count == 150000 ) {
			north.setLightState(s2[0]);
			south.setLightState(s2[1]);
			east.setLightState(s2[2]);
			west.setLightState(s2[3]);
			System.out.println("North");
			north.showLight();
			System.out.println("South");
			south.showLight();
			System.out.println("East");
			east.showLight();
			System.out.println("West");
			west.showLight();
		}
		if (count == 300000 ) {
			north.setLightState(s3[0]);
			south.setLightState(s3[1]);
			east.setLightState(s3[2]);
			west.setLightState(s3[3]);
			System.out.println("North");
			north.showLight();
			System.out.println("South");
			south.showLight();
			System.out.println("East");
			east.showLight();
			System.out.println("West");
			west.showLight();
		}
		if (count == 450000 ) {
			north.setLightState(s4[0]);
			south.setLightState(s4[1]);
			east.setLightState(s4[2]);
			west.setLightState(s4[3]);
			System.out.println("North");
			north.showLight();
			System.out.println("South");
			south.showLight();
			System.out.println("East");
			east.showLight();
			System.out.println("West");
			west.showLight();
		}
		if (count == 600000 ) {
			north.setLightState(s5[0]);
			south.setLightState(s5[1]);
			east.setLightState(s5[2]);
			west.setLightState(s5[3]);
			System.out.println("North");
			north.showLight();
			System.out.println("South");
			south.showLight();
			System.out.println("East");
			east.showLight();
			System.out.println("West");
			west.showLight();
		}
		if (count == 750000 ) {
			north.setLightState(s6[0]);
			south.setLightState(s6[1]);
			east.setLightState(s6[2]);
			west.setLightState(s6[3]);
			System.out.println("North");
			north.showLight();
			System.out.println("South");
			south.showLight();
			System.out.println("East");
			east.showLight();
			System.out.println("West");
			west.showLight();
//			count = 0;
		}


	}
}

Here's what I need to do in pseudo-code

If I'm at the 0'th minute, set each light to the first state.
If I'm at the 2nd minute, set each light to the second state.
If I'm at the 3rd minute.....
etc.

I don't know enough about threads to use them so I was hoping I could
simulate this by using an incremented integer value, but I would
suspect that from reading other threads in this group, there's no
really accurate way since the JVM will increment them as fast as it
can.

My code works in that it is setting things correctly, but I only want
them to be set at 2 minute intervals, otherwise, there's no way that
traffic will be able to flow.
0
Reply printdude1968 (96) 5/21/2007 12:13:23 AM 

package sim;

import common.*;

public class TrafficLightTester {
	public static void main(String [] args) {
		final int twoMinutes=120000;
//		create 4 lights
		Light north = new Light(STATE.GO);
		Light south = new Light(STATE.GO);
		Light east = new Light(STATE.STOP);
		Light west = new Light(STATE.STOP);
//		Create 6 STATE arrays
		STATE[] s1 = {STATE.GO, STATE.GO, STATE.STOP, STATE.STOP};
		STATE[] s2 = {STATE.AMBER, STATE.AMBER, STATE.STOP, STATE.STOP};
		STATE[] s3 = {STATE.STOP, STATE.STOP, STATE.LEFT, STATE.LEFT};
		STATE[] s4 = {STATE.STOP, STATE.STOP, STATE.GO, STATE.GO};
		STATE[] s5 = {STATE.STOP, STATE.STOP, STATE.AMBER, STATE.AMBER};
		STATE[] s6 = {STATE.LEFT, STATE.LEFT, STATE.STOP, STATE.STOP};
		int count =  0;
		while  (count <= 6 )
		{
		count++;
		if (count == 1 ) {
			north.setLightState(s1[0]);
			south.setLightState(s1[1]);
			east.setLightState(s1[2]);
			west.setLightState(s1[3]);
			System.out.println("North");
			north.showLight();
			System.out.println("South");
			south.showLight();
			System.out.println("East");
			east.showLight();
			System.out.println("West");
			west.showLight();
		}
		if (count == 2 ) {
			north.setLightState(s2[0]);
			south.setLightState(s2[1]);
			east.setLightState(s2[2]);
			west.setLightState(s2[3]);
			System.out.println("North");
			north.showLight();
			System.out.println("South");
			south.showLight();
			System.out.println("East");
			east.showLight();
			System.out.println("West");
			west.showLight();
		}
		if (count == 3 ) {
			north.setLightState(s3[0]);
			south.setLightState(s3[1]);
			east.setLightState(s3[2]);
			west.setLightState(s3[3]);
			System.out.println("North");
			north.showLight();
			System.out.println("South");
			south.showLight();
			System.out.println("East");
			east.showLight();
			System.out.println("West");
			west.showLight();
		}
		if (count == 4 ) {
			north.setLightState(s4[0]);
			south.setLightState(s4[1]);
			east.setLightState(s4[2]);
			west.setLightState(s4[3]);
			System.out.println("North");
			north.showLight();
			System.out.println("South");
			south.showLight();
			System.out.println("East");
			east.showLight();
			System.out.println("West");
			west.showLight();
		}
		if (count == 5 ) {
			north.setLightState(s5[0]);
			south.setLightState(s5[1]);
			east.setLightState(s5[2]);
			west.setLightState(s5[3]);
			System.out.println("North");
			north.showLight();
			System.out.println("South");
			south.showLight();
			System.out.println("East");
			east.showLight();
			System.out.println("West");
			west.showLight();
		}
		if (count == 6 ) {
			north.setLightState(s6[0]);
			south.setLightState(s6[1]);
			east.setLightState(s6[2]);
			west.setLightState(s6[3]);
			System.out.println("North");
			north.showLight();
			System.out.println("South");
			south.showLight();
			System.out.println("East");
			east.showLight();
			System.out.println("West");
			west.showLight();
			count = 0;
		}
		Thread t = new Thread();
		t.start();
		try {
			Thread.sleep(twoMinutes);
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		}

	}
}
0
Reply printdude1968 5/21/2007 1:04:11 AM

comp.lang.java.help 1307 articles. 5 followers.

1 Replies
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