Java編譯時間出現No enclosing instance of type XXX is accessible.

標籤：

今天在編譯Java程式的時候出現以下錯誤：

No enclosing instance of type Main is accessible. Must qualify the allocation with an enclosing instance of type Main (e.g. x.new A() where x is an instance of Main).

 

我原來編寫的原始碼是這樣的：

public class Main 
{
class Dog //定義一個“狗類”
{
private String name;
private int weight;
public Dog(String name, int weight) 
{
this.setName(name);
this.weight = weight;
}
public int getWeight() 
{
return weight;
}
public void setWeight(int weight) 
{this.weight = weight;}
public void setName(String name)
{this.name = name;}
public String getName() 
{return name;}
}
public static void main(String[] args)
{
Dog d1 = new Dog("dog1",1);

}
}

出現這個錯誤的時候，我一直不太理解。

在借鑒別人的解釋之後才恍然大悟。

在代碼中，我的Dog類是定義在Main中的內部類。Dog內部類是動態內部類，而我的main方法是static靜態。

就好比靜態方法不能調用動態方法一樣。

有兩種解決辦法：

第一種：

將內部類Dog定義成靜態static的類。

第二種：

將內部類Dog在Main類外邊定義。

 

修改後的代碼：

第一種：

 

?

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public class Main {    public static class Dog     {        private String name;        private int weight;        public Dog(String name, int weight)         {            this.setName(name);            this.weight = weight;        }        public int getWeight()         {            return weight;        }        public void setWeight(int weight)         {this.weight = weight;}        public void setName(String name)        {this.name = name;}        public String getName()         {return name;}    }    public static void main(String[] args)    {        Dog d1 = new Dog("dog1",1);     }}

 

 

 

第二種：

 

?

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public class Main {    public static void main(String[] args)    {        Dog d1 = new Dog("dog1",1);     }} class Dog {        private String name;        private int weight;        public Dog(String name, int weight)         {            this.setName(name);            this.weight = weight;        }        public int getWeight()         {            return weight;        }        public void setWeight(int weight)         {this.weight = weight;}        public void setName(String name)        {this.name = name;}        public String getName()         {return name;}}

Java編譯時間出現No enclosing instance of type XXX is accessible.