java - Inner class constructor invocation -

java - Inner class constructor invocation -

the jls says:

the constructor of non-private inner fellow member class implicitly declares, as first formal parameter, variable representing enclosing instance of class.

ok, if write following:

class a:

package org.gradle; public class extends b.inner{ public a(b b){ b.super(); //ok, invoke b.inner(b) } }

class b:

package org.gradle; public class b{ public class inner{ } }

as said here, b.super() invoke b.inner(b).

but if write

class b:

package org.gradle; public class b { class inner{ public inner(b b){ system.out.println("inner(b)"); } } }

class a:

package org.gradle; public class extends b.inner{ public a(b b) { b.super(); //the constructor b.inner() undefined } }

so, in latter illustration b.super() tries invoke b.inner() instead. why difference?

it seek invoke b.inner(b) in sec example.

it can't find because there's b.inner(b, b). if constructor b.inner() gets changed inner(b)... , if constructor b.inner(b) gets changed b.inner(b, b).

note hidden parameter implementation detail, , unless you're studying how java compiler works, don't need know exists.

java