Java打印 vector 的输入并删除具有特定编号的 vector

Question

我有一个类Runner，它有name、startnr、weight和age。我应该能够创建并打印 Runner。

public class Runner {
    private String name;
    private int startnr;
    private int weight;
    private int age;

    public Runner(String name, int startnr, int weight, int age){
        this.name = name;
        this.startnr = startnr;
        this.weight = weight;
        this.age = age;
        print();
    }

    public static void main(String[] args){
        createRunner();
    }

    public void print(){
        System.out.println("Name: " + name);
        System.out.println("Startnr: " + startnr);
        System.out.println("Weight: " + weight);
        System.out.println("Age " + age);
    }

    public static void createRunner(){
        Runner One = new Runner("Two", 0,76,24);
        Runner Two = new Runner("One", 1, 80, 21);
    }
}

然后我有一个类 ControlRunner ，它应该允许管理运行者，即

• 可以(使用扫描仪)读取运行者
• 每个运行者都有一个独特的startnr
• 运行者应该位于Vector内
• 应该可以打印出所有的运行者
• 应该可以删除具有特定 startnr 的运行者

这是我到目前为止所拥有的:

import java.util.Scanner;
import java.util.Vector;

public class ControlRunner {

    static Scanner sc = new Scanner(System.in);
    private static int startnr = 1;
    private static Vector v;
    private static String output, name;
    private static int weight, age;

    static Runner myrunner;

    public static void main(String[] args){
        createLaeufer();
    }

    public static void createLaeufer(){

        System.out.println("Write the amount of runners you want to create");

        Vector<Runner> vector = new Vector<>();

        int amount = sc.nextInt();

        for (int i = 1; i <= amount; i++) {

            System.out.println("Write the name of the runner: ");
            name = sc.next();

            System.out.println("Write the weight of the runner: ");
            weight = sc.nextInt();

            System.out.println("Write the age of the runner: ");
            age = sc.nextInt();

            myrunner = new Runner(name, startnr, weight, age);
            vector.add(myrunner);
            // v.forEach(Runner -> myrunner.print());
            startnr++;

        }

        System.out.println("Do you want to print all runners? (Y/N) ");
        output = sc.next();
        if (output.equals("Y")) {
            vector.forEach(Runner -> myrunner.print());
        } else {
            return;
        }


        System.out.println("Do you want to delete a runner? (Y/N) ");
        String delete = sc.next();
        if (delete.equals("Y")){
            System.out.print("Write the starting number: ");
            int nummer = sc.nextInt();
            vector.remove(nummer - 1);
        } else {
            return;
        }
    }
}

我遇到的问题是我不知道如何通过 vector 打印所有运行者。 (目前，它只打印一个)。另一个问题是它在删除运行程序后终止，因为 else 只是给出返回。 (我认为这个结构不好，因为我是 Java 新手)。我该如何改进？

Answer 1

在这部分中，您不使用 vector ，仅打印最后的数据。

System.out.println("Do you want to print all runners? (Y/N) ");
output = sc.next();
if (output.equals("Y")){
    System.out.println("Name: " + name);
    System.out.println("Startnr: enter code enter code herehere" + (startnr - 1));
    System.out.println("Weight: " + weight);
    System.out.println("Age " + age);
} else {
    return;
}

如果你想打印所有 vector 信息，你需要这样的东西:

v.forEach(runner -> runner.print())

此外，您还可以在循环内创建 vector ，因此您可以为每个运行者创建 vector ，然后忘记它。我认为你需要在创建运行者的循环之前创建 vector 。