Java - 如何访问另一个类的 ArrayList? [英] Java - How to access an ArrayList of another class?

问题描述

您好，我是 Java 初学者，这是我的问题:我有这个第一类，其中包含以下变量:

Hello I'm a beginner in Java and this is my question: I have this first class with the following variables:

import java.util.ArrayList;

public class numbers {
    private int number1 = 50;
    private int number2 = 100;
}

我也有这门课:

import java.util.ArrayList;

public class test {
    private numbers number;
}

我的问题是:我想存储 number1 &number2 变量放入一个 ArrayList，然后从类 test 访问这个 ArrayList.我该怎么做?

My question here is: I want to store the number1 & number2 variables into an ArrayList, then access this ArrayList from class test. How can I do that?

推荐答案

import java.util.ArrayList;
public class numbers {
   private int number1 = 50;
   private int number2 = 100;
   private List<Integer> list;

   public numbers() {
       list = new ArrayList<Integer>();
       list.add(number1);
       list.add(number2);
   }

   public List<Integer> getList() {
       return list;
   }
}

和测试类:

import java.util.ArrayList;
public class test {
   private numbers number;

   //example
   public test() {
     number = new numbers();
     List<Integer> list = number.getList();
     //hurray !
   }
}

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