用Java返回多个值 [英] Return multiple values in Java

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本文介绍了用Java返回多个值的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

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,有没有办法返回多个值?



我的代码:

  String query40 =SELECT Good_Name,Quantity,Tbl1的价格,其中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);
返回GoodNameShow,QuantityShow,GoodUnitPriceShow;

$ / code>


解决方案

在Java中,一个返回多个值的函数,您必须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


    您的情况显然需要定义一个类显示,其中可能有字段名称数量价格

      public class显示{
    私有字符串名称;
    私有诠释价格;
    //添加其他字段,构造函数和访问器
    }

    然后更改您的函数到

      public显示测试(){
    ...
    返回新显示(GoodNameShow,QuantityShow ,GoodUnitPriceShow);


    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?

    My code:

    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 ;
    }
    

    解决方案

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

    • embed those values in an object you return
    • or change an object that is passed to your function

    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
    }
    

    then change your function to

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

    这篇关于用Java返回多个值的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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