java - 由用户创建新实例

Question

作为最熟练的 JAVA 用户，您可能已经看到，这是行不通的。 sb 不能同时用作String 和instance。但你一定也知道我在这里想做什么。我尝试让用户创建 Cook 类的新实例。但由于 cook1 和 cook2 已经存在(已在代码中创建)，我现在希望用户创建一个新的。不知何故，sb必须充当变量，导致潜在的下一个厨师必须插入为cook4等......在 Java 中如何做到这一点？？？

package kebabStore;

import java.util.Scanner;

public class NewCook {
    static String newcookname;
    static String newcookaddress;
    static String newcookpobox;
    static String newcooktown;
    static int newcooktaxnumber;        

    static Scanner scanner = new Scanner(System.in);

    public static void newcook () {
        Cook.numberofcooks++;      //this works, this counter adds up.
        System.out.println("Enter name new cook");

        newcookname = scanner.nextLine();

        System.out.println("enter address new cook");

        newcookaddress = scanner.nextLine();        

        System.out.println("Enter PO Box new cook");

        newcookpobox = scanner.nextLine();

        System.out.println("Enter town new cook?");

        newcooktown = scanner.nextLine();

        System.out.println("Enter tax number new cook");

        newcooktaxnumber = scanner.nextInt();       

        StringBuilder sb = new StringBuilder("cook");
        sb.insert(3,Cook.numberofcooks);

        System.out.println(sb);      // check if the constructor works, yes it does!! it says "cook3"

        Cook sb     = new Cook (newcookname, newcookaddress, newcookpobox, newcooktown,  newcooktaxnumber);     

        System.out.println("A new cook has been hired " +sb.getName() + ", living in " + sb.getTown() );           

    }
}

Answer 1

你应该通过收集来做到这一点(正如评论中已经提到的)。我还假设您应该让您的方法返回您创建的实例:

public static Cook newcook() {
    //all your logic is the same
    return sb;
}

然后，在调用方法 newcook 的范围开始处:

List<Cook> cooks = new ArrayList<Cook>();
...
cooks.add(cook1);
cooks.add(cook2); // Since they already exist, as you mentioned

cooks.add(newcook()); // inserts third