velocitytester.java

JAVA编程思想第四版英文原版习题答案. pdf原版的

// operators/VelocityTester.java
// TIJ4 Chapter Operators, Exercise 4 page 101
// Write a program that calculates velocity using a constant distance
// and a constant time.

class VelocityCalculator {
	static float velocity (float d, float t) {
		if(t == 0) return 0f;
		else return d/t;
	} 
}

public class VelocityTester {
	public static void main(String[] args) {
		float d = 565.3f;
		float t = 3.6f;
		System.out.println("Distance: " + d);
		System.out.println("Time: " + t);
		float v = VelocityCalculator.velocity(d, t);
		System.out.println("Velocity: " + v);		
	}
}