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Hi, I have the following java class: class Outer { private Integer a; private Long b; class Inner { public void foo() { System.out.println("a and b are " + a + " " + b); } } } when I run javap on Outer and Outer$Inner, I get the following: C:\test>...
Started by on , 3 posts by 3 people.  
So those methods are there....
Edit(this$0).
Non-static inner classes have an implicit reference to an instance of the outer class on the inner class have an implicit parameter of the outer class, which is how this$0 is passed in.
I am befuddled why this is allowed public class Foo { class Bar extends Foo { } } Yet this is not allowed public class Foo { class Bar extends Foo { } class Fooey extends Bar { } } The compiler informed that it can not reference Fooey.this before supertype...
Started by on , 4 posts by 4 people.  
Tom Hawtin answer is correctI guess the JLS and....
The outer this on the superclass " ((Bar)this).this$0 " (IIRC an inner class extend its own outer class, or extend any inner class.
As the inner instance is fecked up).
Can we create the object of inner class in the constructor of outer class?
Started by on , 4 posts by 4 people.  
Public class Outer { public Outer() { Inner inner = new Inner(); } class....
Class Inner(){ //code } public class Outer(){ Inner foo; public Outer() { this.foo = new Inner(); } } Sure.
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If I have an instance of an inner class, how can I access the outer class from code that is not in the inner class ? I know that within the inner class, I can use Outer.this to get the outer class, but I can't find any external way of getting this. For...
Started by on , 7 posts by 7 people.  
The bytecode of the Outer$Inner class will contain a package-scoped field ....
If you need to access the outer class through an instance of the inner the outer class, or through an interface.
There is no way, by design.
What is the difference between INNER JOIN and OUTER JOIN?
Started by on , 6 posts by 5 people.  
You'll note that I did not say....
An inner join can often be faster circumstances an inner join can be faster and in some circumstances an outer join can be faster.
Kevin : An outer join is not necessarily faster or slower.
I have a situation like so... class Outer(object): def some_method(self): # do something class Inner(object): def __init__(self): self.Outer.some_method() # <-- this is the line in question How can I access the Outer class's method from the Inner class...
Started by on , 3 posts by 3 people.  
For example, if you try this: class Outer(object): def some_method(self): # do something class InnerThe methods of....
Classes, since the nesting does not imply any particular relationship between the inner and outer classes it will.
Consider the following Python (runs in 2.x or 3.x): class Outer(object): pass class Inner(object): def __init__(self): print("Inner.self", self) o = Outer() i = o.Inner() I want to get my hands on o while inside Inner.__init__() . But: I don't want o ...
Started by on , 6 posts by 6 people.  
Instead of using nested classes, use containment of instances -- define Outer and Inner separately, and create an instance....
You should redesign your code not to use inner classes and to explicitly pass the instance of Outer.
Why is the order of tables important when combining an outer & an inner join ? the following fails with postgres: SELECT grp.number AS number, tags.value AS tag FROM groups grp, insrel archiverel LEFT OUTER JOIN ownrel ownrel ON grp.number = ownrel.dnumber...
Started by on , 6 posts by 6 people.  
In your case, it's almost certainly a result archiverel ON archiverel.dnumber = grp.number LEFT OUTER JOIN ownrel ownrel ON grp.number = ownrel.dnumber LEFT OUTER JOIN tags....
INNER JOINS before the OUTER JOINS (when possible).
Given two data frames df1 = data.frame(CustomerId=c(1:6),Product=c(rep("Toaster",3),rep("Radio",3))) df2 = data.frame(CustomerId=c(2,4,6),State=c(rep("Alabama",2),rep("Ohio",1))) > df1 CustomerId Product 1 Toaster 2 Toaster 3 Toaster 4 Radio 5 Radio...
Started by on , 4 posts by 4 people.  
Right outer: merge(df1, df2, all.y=TRUE) Just as with the inner join, you would probably want Method Since your keys are named the same the short way to do an inner join is merge(): merge(df1,df2) a full inner join (all records....
In the following snippet public class a{ public void otherMethod(){} public void doStuff(String str, InnerClass b){} pubic void method(a){ doStuff("asd", new InnerClass(){ public void innerMethod(){ otherMethod(); } } ); } } Ss there a keyword to refer...
Started by on , 4 posts by 4 people.  
In general you use OuterClassName.this to refer to the enclosing instance of the outer class.
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