java - 线程 "main"java.lang.Error : Unresolved compilation problem: 中出现异常

Question

这个问题已经有答案了:

What causes error "No enclosing instance of type Foo is accessible" and how do I fix it? (11 个回答)

Java: Unresolved compilation problem (10 个回答)

已关闭 4 年前。

public class constructor {

    class Person {
        private String name;
        private String birthday;
        private String sex;

        public Person( String name, String birthday, String sex) {
            this.name = name;
            this.birthday = birthday;
            this.sex = sex;
        }        
    }


    public static void main(String[] args) {
        Person obj=new Person("safwan","01--05-1999","male");

    }

}

线程“main”java.lang.Error中出现异常: Unresolved 编译问题: 无法访问类型构造函数的封闭实例。必须使用构造函数类型的封闭实例来限定分配(例如 x.new A()，其中 x 是构造函数的实例)。

at constructor.main(constructor.java:18)

Answer 1

您可以将您的 Person 类设为静态:

public class constructor {

    static class Person {

        private String name;
        private String birthday;
        private String sex;

        public Person( String name, String birthday, String sex) {
            this.name = name;
            this.birthday = birthday;
            this.sex = sex;
        }        
    }

    public static void main(String[] args) {

        Person obj=new Person("safwan","01--05-1999","male");
    }
}

这样就可以编译了。