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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 shrini1000 on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
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.
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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 sal on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
Tom Hawtin answer is correctI guess the JLS and....
The outer this on the superclass " ((Bar)this).this$0 " (IIRC an inner class extend its own outer class, or extend any inner class.
As the inner instance is fecked up).
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Can we create the object of inner class in the constructor of outer class?
Started by kitty ahuja on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
Public class Outer { public Outer() { Inner inner = new Inner(); } class....
Class Inner(){ //code } public class Outer(){ Inner foo; public Outer() { this.foo = new Inner(); } }
Sure.
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If I have an instance of an inner class, how can I access the outer class from code that is not in the inner class ? I know that within the inner class, I can use Outer.this to get the outer class, but I can't find any external way of getting this.
For...
Started by Kip on
, 7 posts
by 7 people.
Answer Snippets (Read the full thread at stackoverflow):
The bytecode of the Outer$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.
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What is the difference between INNER JOIN and OUTER JOIN?
Started by cdv on
, 6 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
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.
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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 T. Stone on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
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.
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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 Larry Hastings on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
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.
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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 Thies Edeling on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
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).
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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 Dan Goldstein on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
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....
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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 shsteimer on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
In general you use OuterClassName.this to refer to the enclosing instance of the outer class.
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