把注释和关键步骤作业写出来import java.util.Scanner;public class TestOdome
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public class Odometer {

x09x09//journey初始位置,surplusJourney剩余燃油可行驶里程

x09x09private double journey,surplusJourney;

x09x09//剩余燃油

x09x09private double fuel;

x09x09//燃油效率

x09x09private double efficiency;

x09x09//构造方法,在创建Odometer对象时设置初值

x09x09public Odometer(){

x09x09x09journey = 0;//初始位置为0

x09x09x09fuel = 60;//初始燃料为60

x09x09x09efficiency = 50;//初始效率为50%

x09x09}

x09x09

x09x09//设置初始位置

x09x09public void setdistance(){

x09x09x09journey = 0;

x09x09}

x09x09//设置燃油效率

x09x09public void setEfficiency(double e){

x09x09x09efficiency = e;

x09x09}

x09x09//返回剩余燃油

x09x09public double getFuel(double f){

x09x09x09journey += f;

x09x09x09fuel -= f / efficiency;

x09x09x09System.out.println("剩余燃料："+fuel);

x09x09x09return fuel;

x09x09}

x09x09//返回剩余燃油可行驶里程

x09x09public double getSurplusJourney(){

x09x09x09surplusJourney = fuel * efficiency;

x09x09x09return surplusJourney;

x09x09}

x09x09//输出剩余燃油可走的路程

x09x09public String toString(){

x09x09x09return "剩余燃油可走的路程:" + getSurplusJourney();

x09x09}

}

public class TestOdometer {

x09public static void main(String[] args){

x09x09//输入的旅行距离

x09x09double journey;

x09x09//输入的燃油效率

x09x09double efficiency;

x09x09//创建Odometer对象,调用Odometer的构造方法设置初始值

x09x09Odometer odometer = new Odometer();

x09x09//从控制台输入旅行距离

x09x09Scanner scan = new Scanner(System.in);

x09x09System.out.println("请输入旅行距离:");

x09x09journey = scan.nextDouble();

x09x09//返回剩余燃料

x09x09odometer.getFuel(journey);

x09x09//输出剩余燃料按照50%的 效率可行驶的路程

x09x09System.out.println(odometer);

x09x09//输入新的燃油效率

x09x09System.out.println("请输入燃油效率:");

x09x09efficiency = scan.nextDouble();

x09x09odometer.setEfficiency(efficiency);

x09x09//输出剩余燃料按照新的效率可行驶的路程

x09x09System.out.println(odometer);

x09}

}

这样看得懂不?

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