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How are multiple Java files compiled together?

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I am new to Java.

Here are two files.

VolcanoApplication.java
class VolcanoApplication {
	public static void main(String[] arguments) {
		VolcanoRobot dante = new VolcanoRobot();
		dante.status = "exploring";
		dante.speed = 2;
		dante.temperature = 510;
		
		dante.showAttributes();
		System.out.println("Increasing speed to 3.");
		dante.speed = 3;
		dante.showAttributes();
		System.out.println("Changing temperature to 670");
		dante.temperature = 670;
		dante.showAttributes();
		System.out.println("Checking the temperature.");
		dante.checkTemperatur();
		dante.showAttributes();
	}
}

VolcanoRobot.java
class VolcanoRobot {
	String status;
	int speed;
	float temperature;
	
	void checkTemperatur() {
		if (temperature > 50) {
			status = "returning home";
			speed = 5;
		}
	}
	
	void showAttributes() {
		System.out.println("Status: " + status);
		System.out.println("Speed: " + speed);
		System.out.println("Temperature: " + temperature); 
	}
}

I compiled the program by doing
$ javac VolcanoApplication.java

But how does Java know that VolcanoRobot.java should also be in the compilation?

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Thread

How are multiple Java files compiled together? Jason Kim <iamjsonkim@gmail.com> - 2012-05-27 15:48 -0700
  Re: How are multiple Java files compiled together? Knute Johnson <nospam@knutejohnson.com> - 2012-05-27 16:34 -0700
    Re: How are multiple Java files compiled together? Jason Kim <iamjsonkim@gmail.com> - 2012-05-27 16:47 -0700
      Re: How are multiple Java files compiled together? Lew <noone@lewscanon.com> - 2012-05-27 20:18 -0700
        Re: How are multiple Java files compiled together? Knute Johnson <nospam@knutejohnson.com> - 2012-05-27 21:08 -0700
          Re: How are multiple Java files compiled together? Gene Wirchenko <genew@ocis.net> - 2012-05-28 09:32 -0700
            Re: How are multiple Java files compiled together? Lew <noone@lewscanon.com> - 2012-05-28 22:35 -0700
              Re: How are multiple Java files compiled together? Gene Wirchenko <genew@ocis.net> - 2012-05-29 09:20 -0700
  Re: How are multiple Java files compiled together? Roedy Green <see_website@mindprod.com.invalid> - 2012-05-27 17:35 -0700
    Re: How are multiple Java files compiled together? Roedy Green <see_website@mindprod.com.invalid> - 2012-05-27 19:34 -0700
    Re: How are multiple Java files compiled together? Roedy Green <see_website@mindprod.com.invalid> - 2012-05-28 04:00 -0700
      Re: How are multiple Java files compiled together? Lew <noone@lewscanon.com> - 2012-05-28 22:56 -0700

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