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From: Jason Kim <iamjsonkim@gmail.com>
Newsgroups: comp.lang.java.programmer
Subject: How are multiple Java files compiled together?
Date: Sun, 27 May 2012 15:48:01 -0700 (PDT)
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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?