我正在用Java编程，遇到以下异常...

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

//Creating john     
    Employee john =new Employee(Name,Address,Age,Salary);
    //closing the scanner
    in.close();

    john.info();
}
class Employee
{
    //variables
    private String name ="";
    private String address="";
    private double salary=0.0;
    private int age=0;

    //constructor
    public Employee(String n, String add,int a, double s )
    {
        name = n;
        address = add;
        salary = s;
        age = a;        
    }
    public void info()
    {
        System.out.println(name);
        System.out.println(address);
        System.out.println(age);
        System.out.println(salary);
    }

最佳答案

该错误几乎解释了这一切。您可能在Host中有一个非静态内部类，并且试图在静态上下文中将其实例化(即Host.Inner obj = new Host.Inner())。您可以将该类设为静态，也可以使用外部类的实例对其进行实例化。所有这些信息都可以在docs中获得。一个简单的谷歌搜索就会发现这一点。

https://stackoverflow.com/questions/18022694/