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[英]Why do I get an error when I try to click outside the inventory / in the inventory where there's no item
[英]Why do i get a error when i try to define these three constructors? Examples given
好的,問題是,NetBeans表示已經定義了第二個。 這三個是我在頂部的構造函數,如果set或get方法是它的錯誤,則列出整個程序。 所以我要說的是
public Dog(String initialName)public Dog(String initialBreed)public Dog(double initialWeight)
該錯誤顯示在公共Dog(String initialBreed)上。 我是否濫用了過載方法? 我也必須使用過載方法,它是強制性的。
package dog;
import java.util.*;
public class Dog
{
// instance variables
private String name;
private String breed;
private double weight;
public Dog( )
{
name = "no name";
breed = "no breed";
weight = 0.0;
}
public Dog(String initialName)
{
name = initialName;
breed = "no breed";
weight = 0.0;
}
public Dog(String initialBreed){
name = "no name";
breed = initialBreed;
weight = 0.0;
}
public Dog(double initialWeight){
name = "no name";
breed = "no breed";
weight = initialWeight;
}
public void SetDog(String newName, String newBreed, double newWeight)
{
name = newName;
breed = newBreed;
if (newWeight <= 0)
System.out.println("Error: Negative weight.");
else
weight = newWeight;
}
public void setName(String newName){
name = newName;
}
public void setBreed(String newBreed){
breed = newBreed;
}
public void setWeight(double newWeight){
weight = newWeight;
}
public double getWeight(){
return weight;
}
public String getName(){
return name;
}
public String getBreed(){
return breed;
}
}
問題是你的兩個構造函數采用相同的參數:
public Dog(String initialName)
public Dog(String initialBreed){
他們倆都帶string
。 您不能擁有兩個具有完全相同名稱和參數的方法。
基於我認為您嘗試做的事情,您可能需要一個構造函數來獲取所有這三個參數:
public Dog(String initialName, String initialBreed, double initialWeight){
public Dog(String initialName)
{
name = initialName;
breed = "no breed";
weight = 0.0;
}
public Dog(String initialBreed){
name = "no name";
breed = initialBreed;
weight = 0.0;
}
您定義的上述兩個構造函數未正確重載,因為它們具有相同類型和參數數量的相同標頭。
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