一.程序说明：
主类类名：Drive
参数：
距离distance
用油oil
每升里程数peroil
平均里程数average
测试类名：DriveTest
测试数据：
driver1:
distance:123 oil:12 driver2:
distance:200 oil:26
测试结果： Enter the distance for driver:123
Enter the oil for driver:12
driver1:
distance:123km oil:12L peroil:10.25km
So far,the
average is:10.25km.
Pay attetion:Enter -1 for distance to quit!
二.程序源码：
1.主类源码：
public class Drive
{
private int distance;
private int oil;
private double peroil;
public void setDistance(int
imDistance)
{
distance=imDistance;
}
public int getDistance()
{
return distance;
}
public void setOil(int imOil)
{
oil=imOil;
}
public int getOil()
{
return oil;
}
public double getPeroil()
{
peroil=(double)distance/oil;
return peroil;
}
}
2.测试类名：
import java.util.Scanner;
public class DriveTest
{
public static void main(String args[])
{
Drive drive=new Drive();
Scanner input=new
Scanner(System.in);
int depositDistance;
int depositOil;
int addDistance=0;
int addOil=0;
double average;
int i=1;
System.out.printf("Enter the distance for
driver:");
depositDistance=input.nextInt();
System.out.printf("Enter the oil for driver:");
depositOil=input.nextInt();
System.out.println();
while(depositDistance!=-1)
{
drive.setDistance(depositDistance);
System.out.printf("driver%d:\n distance:%dkm",i,drive.getDistance());
drive.setOil(depositOil);
System.out.printf(" oil:%dL peroil:%.2fkm\n",drive.getOil(),drive.getPeroil());
++i;
addDistance+=depositDistance;
addOil+=depositOil;
average= (double) addDistance/addOil;
System.out.printf(" So far,the average is:%.2fkm.",average);
System.out.println();
System.out.println();
System.out.printf("Pay attetion:Enter -1 for
distance to quit!\n");
System.out.println();
System.out.printf("Enter the distance for
driver:");
depositDistance=input.nextInt();
if(depositDistance==-1);
else
{System.out.printf("Enter the oil for
driver:");
depositOil=input.nextInt();
System.out.println();
}
}
}
}