Question

i want to access the arr variable from inside the inner class method MyMethod. When i try to print it from there i end up getting a null pointer exception.

public class MyClass{
    String[] arr;
    MyClass my;

    public MyClass(){
      my = new MyClass();
    }

     public class MyInner {
        public void MyMethod() {
            // I need to access 'my.arr' from here how can i do it. 
         }

       }

     public static void main(String[] args) {
       String[] n={"ddd","f"};

       my.arr=n;
     }
}

Answer 1

You haven’t initialized it yet, so the reference is null. Initialize it in your constructor for example, and you will have access to the variable via your inner class.

public class MyClass {
    String[] arr;

    public MyClass (String[] a_arr) {
        arr = a_arr;
    }

    public class MyInner {
        public void MyMethod () {
            // I need to access 'my.arr' from here how can i do it. 
        }

    }

    public static void main (String[] args) {
        String[] n= {"ddd","f"};
        MyClass myClass = new MyClass (n);
    }
}