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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$0 " (IIRC an inner class extend its own outer class, or extend any inner class.
As the inner instance is fecked up).
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I have a class as follows:
private class LanePair { public int cameraNumber; public Nest nest1, nest2; public LanePairStatus status = LanePairStatus.TIMER_OFF; Timer timer = new Timer(); public LanePair(int cameraNunber, Nest nest1, Nest nest2) { this...
Started by FallSe7en on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
DoAskForLaneClear(LanePair.this);
Since you can't use this (it will reference the TimerTask ), but your anonymous class can't exist wihtout an instance of LanePair , that instance is referenced by LanePair.this
LanePair.class
?
I think you want either... .
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Can we create the object of inner class in the constructor of outer class?
Started by kitty ahuja on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
Public class Outer { public Outer() { Inner inner = new Inner(); } class....
Class Inner(){ //code } public class Outer(){ Inner foo; public Outer() { this.foo = new Inner(); } }
Sure.
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If I have an instance of an inner class, how can I access the outer class from code that is not in the inner class ? I know that within the inner class, I can use Outer.this to get the outer class, but I can't find any external way of getting this.
For...
Started by Kip on
, 7 posts
by 7 people.
Answer Snippets (Read the full thread at stackoverflow):
The bytecode of the Outer$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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What is the difference between an inner join and outer join? What's the precise meaning of these two kinds of joins?
Started by freenight on
, 10 posts
by 10 people.
Answer Snippets (Read the full thread at stackoverflow):
INNER JOIN returns rows that exist in both tables
OUTER JOIN returns all rows that exist in either excellent:
A Visual Explanation of SQL Joins
INNER JOIN
LEFT OUTER JOIN
Marc
Wikipedia to the rescue:
Inner Joins
....
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I have the following code. I want to get hold of the outer class object using which I created the inner class object inner . How can I do it?
public class OuterClass { public class InnerClass { private String name = "Peakit"; } public static void main...
Started by peakit on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
I don't think there's a way to get the instance from outside the code... .
If you want to access the outer class from the innerWithin the inner class itself, you can use OuterClass.this .
The fundamental concepts of Object-Oriented programming.
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I'm using a static analyzer in Eclipse to examine my code. One class, foo, has an inner class, bar. I am getting the following error:
JAVA0043 Inner class 'bar' does not use outer class 'foo'
Why is this an error? As long as the outer class uses the inner...
Answer Snippets (Read the full thread at stackoverflow):
The whole point of the inner class is that it has access to the outer class; this.column = column; } } }
If the inner class can only ever be used by the outer class, yet the inner class needs no reference....
For the "error".
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Say I have 3 tables. TableA, TableB, TableC
I need to operate the recordset that is available after a INNER JOIN.
Set 1 -> TableA INNER JOIN TableB Set 2 -> TableC INNER JOIN TableB
I need the Set 1 irrespective of if Set 2 is empty or not ( LEFT...
Started by Bob Smith on
, 10 posts
by 10 people.
Answer Snippets (Read the full thread at stackoverflow):
Select * from ((((TableA a inner join TableB b on a.id = b.id) left outer join TableC c on b.id * FROM TableA a INNER JOIN TableB b ON a.id=b.id LEFT OUTER JOIN (SELECT * FROM TableC c INNER JOIN TableD d asking for:....
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