import jade.core.behaviours.TickerBehaviour; //导入依赖的package包/类
public void setup() {
super.setup();

// Add a TickerBehaviour, which periodically updates the picture in the belief base
addBehaviour(new TickerBehaviour(this, 500) {
	int index = 0;
	protected void onTick() {
	    String imageId = (String)getArguments()[index];
	    byte[] imageCt = JPEGUtilities.toBytesArray(imageId);

	    Formula imageFormula = IMAGE_CONTENT_PATTERN.instantiate("content", new ByteConstantNode(imageCt));
	    // Retract the current picture from the belief base
	    getSemanticCapabilities().getMyKBase().retractFormula(IMAGE_CONTENT_PATTERN);
	    // If one uses the equals formula, the retract operation is useless,
	    // because the semantics of the iota part of the formula entails this retraction

	    // Assert the new picture (as in the previous exercise)
	    getSemanticCapabilities().interpret(imageFormula);

	    index = (index + 1) % getArguments().length;
	}
});
   }