需求：汽车无人驾驶会涉及到大量判断，当汽车行驶的时候遇到了红绿灯，就会进行判断，如果红灯亮，就停止；如果黄灯亮，就减速；如果绿灯亮，就行驶。

代码：

java">package demo01;
public class HelloJava {public static void main(String[] args){boolean redLight = false;boolean yellowLight = false;boolean greenLight = true;if(redLight == true){System.out.println("停止！");}if(yellowLight == true){System.out.println("减速！");}if(greenLight == true){System.out.println("行驶！");}}
}    

运行结果：