Question

似乎有20个团在不断形成的过程中。第一组有1000名男子，第二名有900名，第三名有900名，依此类推至第二十二团，只有50人。每周都有100名男子加入每个团，并在周末，最大的团被派往前线。这持续了20个星期。

对于这个程序，我已经设法打印出每个团的原始人数。但是我很难在每个团中增加100名士兵。增兵必须是军队中的一种方法。我使用.txt文件获取了regiment对象。所有这些文件都包含编号为1-20的团的名称。

我目前没有错误我唯一的问题是我不知道如何将男性加入我的团。我必须在军队类中使用addMen方法，我目前有空白。

    public class Regiment {

    private String name;       //name of regiment 
    private int regNumber;     //regiment number
    private int men;           // regiment men 

    public Regiment(int regNumber, String name, int men) {
        this.name = name;
        this.regNumber = regNumber;
        this.men = men;
    }

    public String getName() {
        return name;
    }

    public int getregNumber() {
        return regNumber;
    }

    public int getMen() {
        return men;
    }

    public int addMen2(int RegNumber) {
        int men = 1050 - (regNumber * 50);
        return men;
    }

    }

ArmyDataList：

    class ArmyDataList {

        public ArrayList<Regiment> list;

    public ArmyDataList() {
        list = new ArrayList<Regiment>();
    }

    public void AddToList(Regiment current) {
        list.add(current);
    }

    public void RemoveFromList(Regiment current) {
        list.remove(current);
    }

    public Regiment getLargest() {
        if (list.isEmpty()) {
            return null;
        }
        Regiment Reg1 = list.get(0);

        for (int i = 1; i < list.size(); i++) {
            Regiment current = list.get(i);      // get next regiment
            // is current regiment > largest
            if (current.getMen() > Reg1.getMen()) {
                Reg1 = current;
            }
        }
        return Reg1;

    }

    public void addMen() {

    }

    public String toString() {

        String out
                = String.format("%28s%12s%n", "Regiments", " Men")
                + String.format("%12s%n", "Number")
                + String.format("%12s%16s%14s%n", "=======", "===============",
                        "=========");

        for (int i = 0; i < list.size(); i++) {

            Regiment regim = list.get(i);
            int regNumber = regim.getregNumber();
            String name = regim.getName();
            int men = regim.addMen2(regNumber);

            out = out + String.format("%12s", regNumber)
                    + String.format("%16s", name)
                    + String.format("%10s", men)
                    + "\n";
        }
        return out + "\n";

    }
}

RegimentTest：

 public class RegimentTest {

   public static void main(String[] args) throws IOException
   {


  ArmyDataList army = new ArmyDataList();

      Scanner fileScan = new Scanner(new File("regiments.txt"));

      System.out.println("Report Summary:\n");

      while (fileScan.hasNext()) {
         String line = fileScan.nextLine();

         System.out.println(line);

         Scanner in = new Scanner(line) ;

        int regNumber = in.nextInt();
        String name = in.next();
        int men = 0 ; //men is set to 0 only because I havent add the men yet

        Regiment adder = new Regiment(regNumber, name, men );

         army.AddToList(adder) ;
      }

         System.out.println(army.toString());

      }

Answer 1

在setMen(int numberOfMen)课程中添加Regiment方法。然后在addMen()方法中，您可以执行以下操作：

public void addMen(){
    for(Regiment r : list){ //iterate through the list of regiments
        r.setMen(r.getMen() + 100); //add 100 men to each regiment
    }
}

setMen方法如下所示：

public void setMen(int numberOfMen){
    men = numberOfMen;
}

你的toString方法存在另一个问题，即调用团的addMen2方法 - 现在你只是打印数字，而不是初始化人数。在Regiment类的构造函数中，替换

行

this.men = men;

带

this.men = addMen2(regNumber);

然后在您的toString方法中，替换

int men = regim.addMen2(regNumber);

带

int men = regim.getMen();

以下是main应该是这样的内容：

public static void main(String[] args) throws IOException{

    ArmyDataList army = new ArmyDataList();
    Scanner fileScan = new Scanner(new File("regiments.txt"));
    System.out.println("Report Summary:\n");
    while (fileScan.hasNext()) {
        String line = fileScan.nextLine();
        System.out.println(line);
        Scanner in = new Scanner(line);
        int regNumber = in.nextInt();
        String name = in.next();
        int men = 0 ; //men is set to 0 only because I havent add the men yet
        Regiment adder = new Regiment(regNumber, name, men );
        army.AddToList(adder);
    }
    System.out.println(army.toString()); //print out the initial # of men
    for(int i = 0; i < 20; i++)
        army.addMen();
    System.out.println(army.toString()); //print the final # of men
}

Answer 2

Regiment中的

删除方法addMen2，并将其替换为

public void addMen(int men) {
this.men +=men;
}

然后在你的军队中你可以有方法

 public void addMen(int men) {
      for(Regiment regiment : list){
         regiment.addMen(men);
      }
   }

这将是向每个团队增加100人的最简单的解决方案，

另外一点是，你的toString有点讨厌，军团应该知道它有多么狡猾的士兵，你不需要额外的方法来计算它（我推荐你去垃圾addMen2方法的原因）< / p>

发起你的Regiment，使用构造函数。你想拥有1000,1950,1900等规模的军团，在你创造它们的时候去做

while (fileScan.hasNext()) {
         String line = fileScan.nextLine();
         System.out.println(line);
         Scanner in = new Scanner(line) ;
        int regNumber = in.nextInt();
        String name = in.next();
        int men = 1050 - (regNumber * 50);

        Regiment adder = new Regiment(regNumber, name, men );

         army.AddToList(adder) ;
      }

需要使用ArrayList的帮助

2 个答案: