我正在学习Java,尽管如此,我的知识仍处于学习Java的爬行阶段。我已经读过关于在数组中使用对象的知识,它非常强大。我正在尝试编辑此简单的示例类和测试类,以显示谁是最快的驱动程序,以及最快的速度是什么。我在思考如何解决此问题的方法有两种。一种是找到最大速度,然后找到什么数组号(例如array [2])。我设法在循环中捕获了最高速度,并捕获了阵列号。将其放入方法中,然后调用它会使我感到困惑。任何帮助深表感谢。
我收到的错误代码
TestBikeWithArray.java:73:错误:二进制运算符'>'的错误操作数类型
如果(bikeRace [i]> bikeRace [0])
^
第一种类型:自行车
第二类:自行车
1个错误
工具完成,退出代码为1
他们都是自行车课,我不明白。
public class Bike{
private String driver;
private int gear;
private int cadence;
private int speed;
private int id;
private static int numberOfBikes = 0;
public Bike(String theDriver, int startGear,int startCadence, int startSpeed){
driver = theDriver;
gear = startGear;
cadence = startCadence;
speed = startSpeed;
numberOfBikes++;
id = numberOfBikes;
}
public String getDriver() {return driver;}
public void setDriver(String d) {driver = d;}
public int getGear(){return gear;}
public void setGear(int g){gear = g;}
public int getCadence(){return cadence;}
public void setCadence(int c){cadence = c;}
public int getSpeed(){return speed;}
public void setSpeed(int s) {speed = s;}
public int getID() {return id;}
public static int getNumberOfBikes() {return numberOfBikes;}
// method to print out contents of object
public String toString ()
{
StringBuffer sb = new StringBuffer();
sb.append("\nDriver: " + driver);
sb.append("\nGear: " + gear);
sb.append("\nCadence: " + cadence);
sb.append("\nSpeed: " + speed);
sb.append("\nID: " + id + "\n");
return (new String(sb));
} // end toString method
} // end class
主要测试自行车
import java.util.Scanner;
import javax.swing.JOptionPane;
class TestBike
{
public static void main(String[] args)
{
String message ="";
Bike[] bikeRace = new Bike[10];
bikeRace[0] = new Bike("Cersei Lannister", 0, 0, 0);
bikeRace[1] = new Bike("Daenerys Targaryen", 10, 60, 22);
bikeRace[2] = new Bike("Robb Stark", 21, 50, 15);
//testing values
//bikeRace[3] = new Bike("Melisandre", 31,90,155);
//bikeRace[4] = new Bike("Margaery Tyrell", 2, 3, 100);
bikeRace[0].setGear(3);
for(int i=0; i < Bike.getNumberOfBikes(); i++)
{
System.out.println(bikeRace[i].toString());
//testing, must use a proper function call!
//System.out.println(bikeRace[i].getDriver());
} // end for loop
//find max speed & driver findTheFastestDriver
//testing stuffs get all drivers
/*for(int i=0; i < Bike.getNumberOfBikes(); i++)
{
System.out.println("Driver: " + bikeRace[i].getDriver());
}
//testing get all speeds
for(int i=0; i <Bike.getNumberOfBikes(); i++)
{
System.out.println("Speed: " + bikeRace[i].getSpeed());
} */
//****************************************************************/
//finding fastest bike without a method
//fastest speed is 22
/*int fastestBike = bikeRace[0].getSpeed();
int fastestBikeIndex = 0;
for(int i=0; i<Bike.getNumberOfBikes(); i++)
{
if (bikeRace[i].getSpeed() >= fastestBike)
{
fastestBike = bikeRace[i].getSpeed();
fastestBikeIndex = i;
}//end if
}//end for
System.out.println("fastest Bike Speed: " + fastestBike + " " + " Bike index of " + fastestBikeIndex);*/
//********************************************************************
int fastestBikeIndex = findTheFastestDriver(bikeRace);
System.out.println("\nThe fastest driver is " + bikeRace[fastestBikeIndex].getDriver() + " and the speed of " + bikeRace[fastestBikeIndex].getSpeed() + " mph.");
System.out.println("\nNumber of Bikes: " + Bike.getNumberOfBikes() + "\n");
} //end of main
public static int findTheFastestDriver(Bike[] bikeRace)
{
int fastestBike = bikeRace[0].getSpeed();
int fastestBikeIndex = 0;
for(int i=0; i < Bike.getNumberOfBikes(); i++)
{
if (bikeRace[i].getSpeed() >= fastestBike)
{
fastestBike = bikeRace[i].getSpeed();
fastestBikeIndex = i;
}//end if
}//end for
return fastestBikeIndex;
}
} //end of class
代码有效:)太高兴了。
最佳答案
if (bikeRace[i] > bikeRace[0])
改成if (bikeRace[i].getSpeed() > bikeRace[0].getSpeed())
推理:您不能在数字上比较非数字对象。