Java Error: The constructor is undefined

Question

In Java, Why am I getting this error:

Error: The constructor WeightIn() is undefined

Java Code:

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);
  }
}

I have a constructor defined.

Answer 1

Add this to your class:

public WeightIn(){
}

• Please understand that default no-argument constructor is provided only if no other constructor is written
• If you write any constructor, then compiler does not provided default no-arg constructor. You have to specify one.

Answer 2

With your current implementation, you can't do WeightIn weight1 = new WeightIn(); since default constructor is not defined.

So you can add

public WeightIn(){
}

Or you can do this

WeightIn weight1 = new WeightIn(3.65,1.7) // constructor accept two double values