This is a basic autoclicker for my baseclient

autoclicker.java

public class AutoClicker extends Module {

	public AutoClicker() {
		super("AutoClicker", "This is an autoclicker", 0, Category.COMBAT, AntiCheat.VANILLA);
	}

	@Overerride
	public void setup() {
		moduleSettings.addDefault("cps", 13);
	}

	@Override
	public void onUpdate(UpdateEvent event) {
		if(!(timer.delay(1000 / moduleSettings.getInt("cps"))) // Limit the CPS. You can use Random to add some random (or use noise to make it smooth)
			return;

		// You should also be able to replace this with Minecraft.gameSettings.keyBindAttack.isPressed() or something like that.
		// The difference between Mouse.isButtonDown and that method is that with keyBindAttack the key could be bound to anything and it would still work
		if(Mouse.isButtonDown(0)) {
			mc.clickMouse();
			mc.leftClickCounter = 0;
		}
	}

}

Please, bare in mind that this piece of code does not contain a package declaration nor imports.