Он продолжает говорить мне, что мой конструктор Pet не определен. Есть идеи?infile класс. Constructor undefined
Я пробовал определять Pet в моем основном методе до цикла while, но это дает мне ту же проблему.
import java.util.*;
import java.io.*;
public class ReadPets
{
public static void main (String[] args)
{
ArrayList <Pet> petList = new ArrayList <Pet>();
Scanner inFile = null;
String name;
Pet p;
try
{
inFile = new Scanner
(new FileInputStream ("pets.txt"));
}
catch(FileNotFoundException e)
{
System.out.println("problem opening file.");
System.exit(0);
}
while (inFile.hasNextLine())
{
name = inFile.nextLine();
p = new Pet(name); // here is where my error is
petList.add(p);
}
inFile.close();
}
}
Вот мой класс для домашних животных.
public class Pet
{
private String name;
private int age; //in years
private double weight; //in pounds
/**
This main is just a demonstration program.
*/
public static void main(String[] args)
{
Pet myDog = new Pet();
myDog.set("Fido", 2, 5.5);
myDog.writeOutput();
System.out.println("Changing name.");
myDog.set("Rex");
myDog.writeOutput();
System.out.println("Changing weight.");
myDog.set(6.5);
myDog.writeOutput();
System.out.println("Changing age.");
myDog.set(3);
myDog.writeOutput();
}
public void writeOutput()
{
System.out.println("Name: " + name);
System.out.println("Age: " + age + " years");
System.out.println("Weight: " + weight + " pounds");
}
public void set(String newName)
{
name = newName;
//age and weight are unchanged.
}
public void set(int newAge)
{
if (newAge <= 0)
{
System.out.println("Error: illegal age.");
System.exit(0);
}
else
age = newAge;
//name and weight are unchanged.
}
public void set(double newWeight)
{
if (newWeight <= 0)
{
System.out.println("Error: illegal weight.");
System.exit(0);
}
else
weight = newWeight;
//name and age are unchanged.
}
public void set(String newName, int newAge, double newWeight)
{
name = newName;
if ((newAge <= 0) || (newWeight <= 0))
{
System.out.println("Error: illegal age or weight.");
System.exit(0);
}
else
{
age = newAge;
weight = newWeight;
}
}
public String getName()
{
return name;
}
public int getAge()
{
return age;
}
public double getWeight()
{
return weight;
}
}
Опубликовать класс 'Pet'. Имеет ли он конструктор, который принимает строку как arg? – 4J41