Question

这可能是一个noob问题，因为我刚刚开始使用Java。我用自己的类创建了一个Person对象，并创建了一个创建实际对象的主类（它也是一个数组）。但是，我现在正尝试在另一个类中访问此对象。如何将当前对象更改为能够在Main类之外使用？

Main.java

package me.chris.pizzacost;
import java.text.DecimalFormat;
import java.util.Scanner;

public class Main {

public static void main(String[] args) {

    DecimalFormat f = new DecimalFormat("##.00");
    Scanner scan = new Scanner(System.in);

    static Person[] people;

    System.out.println("Welcome to Pizza Cost!\nTo start, how many people are in on this order?");

    people = new Person[scan.nextInt()];

    scan.nextLine();
    System.out.println("Type their names, pressing ENTER between names.");
    for (int x = 0; x<people.length; x++) {
        //System.out.println("ran");
        people[x] = new Person();
        people[x].name = scan.nextLine();
        //System.out.println("hit the end");
    }
  }
}

Person.java

package me.chris.pizzacost;

public class Person {
  static String name = "blank";
  static double cost;
}

Answer 1

首先

static String name = "blank";
static double cost;

不应该是静态的：

package me.chris.pizzacost;

public class Person {
    String name = "blank";
    double cost;

}

创建一个主要类的setter：

 public class Main {
 //etc...
      public static Person[] people; //put the declaration here. as a class member. 
      public static void setName(int element, String name){
           people[element].name = name; //set the name of the specified element in the array.
      }

在任何其他课程中，只需在STATIC CONTEXT中调用Main.setName(personID, "The Name");

或者只是让people成为public static班级成员，然后致电Main.people[element].name = "Whatever name"（例如：）

package me.chris.pizzacost;
import java.text.DecimalFormat;
import java.util.Scanner;

public class Main {

public static Person[] people; //put the declaration here. as a class member.    

public static void main(String[] args) {

    DecimalFormat f = new DecimalFormat("##.00");
    Scanner scan = new Scanner(System.in);

   // static Person[] people; (get rid of this)

    System.out.println("Welcome to Pizza Cost!\nTo start, how many people are in on this order?");

    people = new Person[scan.nextInt()];

    scan.nextLine();
    System.out.println("Type their names, pressing ENTER between names.");
    for (int x = 0; x<people.length; x++) {
        //System.out.println("ran");
        people[x] = new Person();
        people[x].name = scan.nextLine();
        //System.out.println("hit the end");
    }
  }
}

访问类外的对象

1 个答案: