在 Java 中返回多个值

2022-01-19 00:00:00 function return java

我用 Java 编写了一个函数，我希望这个函数返回多个值.除了使用数组和结构体，有没有办法返回多个值?

I wrote a function in Java and I want this function to return multiple values. Except use of array and structure, is there a way to return multiple values?

我的代码:

String query40 = "SELECT Good_Name,Quantity,Price from Tbl1 where Good_ID="+x;
Cursor c = db.rawQuery(query, null);
if (c!= null && c.moveToFirst()) 
{
  GoodNameShow = c.getString(0);
  QuantityShow = c.getLong(1);
  GoodUnitPriceShow = c.getLong(2);
  return GoodNameShow,QuantityShow ,GoodUnitPriceShow ;
}

推荐答案

在Java中，当你想让一个函数返回多个值时，你必须

In Java, when you want a function to return multiple values, you must

  • 将这些值嵌入到您返回的对象中
  • 或更改传递给您的函数的对象

在您的情况下，您显然需要定义一个类 Show，它可以具有字段 name、quantity 和 price:

In your case, you clearly need to define a class Show which could have fields name, quantity and price :

public class Show {
    private String name;
    private int price;
    // add other fields, constructor and accessors
}

然后将您的功能更改为

 public  Show  test(){
      ...
      return new Show(GoodNameShow,QuantityShow ,GoodUnitPriceShow) ;

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