Question

我正在创建一个应用程序，允许用户为8个赛车手分配一个车道号码。我已将runners名称设置为ArrayList，并将通道设置为Set。目前我正在调用列表并设置为类阵列。我将ArrayList和Set组合为Singleton Map。我无法让Set接受Integer变量raceLane作为Type。任何有关Set问题的帮助以及有关如何将ArrayList和Set转换为Singleton Map的建议都将不胜感激，谢谢。这是我到目前为止所拥有的。

package Race;


import java.util.ArrayList;
import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;


public class LaneDesignation {



//create ArrayList and Set
private ArrayList runnersArray= new ArrayList();
private Set<raceLane> raceLanesSet = new HashSet<raceLane>();
//Declare Variables
private Integer raceLane;  
String runnerName;
int numbRunner, i = 0;
//Call Scanner Instance   
Scanner input = new Scanner(System.in);

public LaneDesignation()
{
    this.raceLane = raceLane;
}

public void setNumb(int numb)
{
    numbRunner= numb;
}   

public void setName()
{
    System.out.print("Please enter the name of runner " + numbRunner + ": ");
    runnerName = input.next();
    i = 0;
    runnersArray.add(i, runnerName); 
    i++;     
}

public String returnName()
{
    return runnerName;
}


public void getLane()
{
    raceLanesSet.add(0, raceLane);

    do
    {

        System.out.print("Please enter the lane the runner is assigned to ");
        while (input.hasNextInt())
        {
            //Test that only numeric characters were entered
            System.out.println("Invalid entry.  Please enter a numeric value");
            System.out.print("Please enter a lane designation from 1-8: ");
            input.next();
        }

        raceLane = input.nextInt();

    }while (raceLane <=0);
    raceLanesSet.add(i, raceLane);

    i++; 
}

public Integer returnLane()
{
return raceLane;
}

public void displayDesignation()
{           
    System.out.println("Runner   |   Desinated Lane");
    while (i < runnersArray.size())
    {
        System.out.println(runnersArray.(i) + " will race in lane" +  raceLanesSet.get(i));
        i++;
    }
}

public void setRaceLane(Integer raceLane)
{
    this.raceLane = raceLane;
} 

}

调用ArrayList和Set并将其组合为ClassArray //受到凯西的启发

package Race;

import java.util.Scanner;
public class Runners {


   //creation array of classes of class LaneDesignation
   LaneDesignation[] Assign = new LaneDesignation[8];//8 Runners and 8 lanes
   Scanner input = new Scanner(System.in);


    public Runners()
    {
      //initialization of the class
      for (int i=0; i<Assign.length; i++){
         Assign[i] = new LaneDesignation();
    }
}

public void raceArray()
{
    for(int i=0;i<Assign.length; i++)
    {       
        Assign[i].setNumb((i+1));        

        Assign[i].setName(); 

        Assign[i].getLane();

     }
}
//Method to display the contents in the list
//I am receiving  runnersArray cannot be resolved to variable error
public void outputRunners() 
{
    for(LaneDesignation currentRunner : runnersArray)
    {
        System.out.println(currentRunner.getRunner());
    }
}

}

Answer 1

集合的类型参数（set / HashSet / ArrayList ...）应该是Object类型。 raceLane不是对象类型，它只是Integer类型的变量。你必须改变

Set<Integer> raceLanesSet = new HashSet<Integer>()

您必须定义一个新类“raceLane”

Set的整数变量无法解析为

1 个答案: