Question

The following code works perfectly.

public class StaticClass {

public static void main(String[] args) {
    L.P h = new L.P();
    h.show();

}

}

class L {

static class P {
    public void show() {
        System.out.println("This is static nested class.");
    }
}

}

Then why static nested class “static class WeakClassKey extends WeakReference> ” in java.lang.Thread class is not accessible by “Thread.WeakClassKey t;” in my class?

The source code for java.lang.Thread can be found here: http://www.docjar.com/html/api/java/lang/Thread.java.html [in line# 1984].

Answer 1

StaticClass and L are in the same package and P class has default (i.e. package private) access modifier. That’s why it is accessible. WeakClassKey has the same modifier – but is in a different package. Only classes from java.lang can access it.