public interface Common {
public double computeSpeed(double a, double b, double c);
}
public class Car007 implements Common{
@Override
public double computeSpeed(double a, double b, double c) {
// TODO Auto-generated method stub
if(c == 0.0) {
throw new ArithmeticException("除數為0");
}
if( a * b < 0.0) {
try {
throw new Exception("速度不能為負數");
} catch (Exception e) {
// TODO Auto-generated catch block
System.out.println("a = " + a + "; b = " + b);
}
}
return a * b / c;
}
}
public class Plane implements Common{
@Override
public double computeSpeed(double a, double b, double c) {
// TODO Auto-generated method stub
if( a + b + c < 0.0) {
try {
throw new Exception("速度不能為負數");
} catch (Exception e) {
// TODO Auto-generated catch block
System.out.println("a = " + a + "; b = " + b + ";c = " + c);
}
}
return a + b + c;
}
}
public class ComputeTime {
/*
*調用時， s = 1000
*/
public double getTime(double s, double a, double b, double c) {
double time = Integer.MAX_VALUE;//表示車速為0，不可能到達
double speed = new Car007().computeSpeed(a, b, c);
if(!(speed == 0.0)) {
time = s / speed;
}
return time;
}
}
public class Test {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println(new ComputeTime().getTime(1000, 10, 20, 30));
}
}
//計算結果：150.0