Java错误：构造函数未定义

问题描述

在Java中，为什么会收到此错误：

In Java, Why am I getting this error:

Error: The constructor WeightIn() is undefined

Java代码：

public class WeightIn{
  private double weight;
  private double height;

  public WeightIn (double weightIn, double heightIn){
    weight = weightIn;
    height = heightIn;
  }
  public void setWeight(double weightIn){
    weight = weightIn;
  }
  public void setHeight(double heightIn){
    height = heightIn;
  }
}

public class WeightInApp{
  public static void main (String [] args){
    WeightIn weight1 = new WeightIn();         //Error happens here.
    weight1.setWeight(3.65);
    weight2.setHeight(1.7);
  }
}

我有一个构造函数。

推荐答案

将此课程添加到您的课程。

add this to your class.

public WeightIn（）{
}

• 请理解，默认的无参数构造函数


• 如果您编写任何构造函数，那么编译器不会提供默认的无参数构造函数。您必须指定一个。

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