StackOverflow2013

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plurals

PO
primarykey
Id
17193141
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2013-06-19T13:54:52.797
FavoriteCount
0
LastActivityDate
2013-06-19T14:06:22.627
LastEditDate
2013-06-19T14:06:22.627
LastEditorUserId
45914
OwnerUserId
1927832
ParentId
17193118
PostTypeId
2
Score
3
ViewCount
0
LastEditorDisplayName
text
Body
You need an instance of <code>A</code> in class <code>B</code> and invoke <code>f2</code> on that instance. For example, you could instantiate one inside the body of <code>f3</code>: <pre><code>public class B { public void f3() { A a = new A(); a.f2(); } } </code></pre> Another way would be for <code>f3</code> to receive an instance of <code>A</code>: <pre><code> public class B { public void f3(A a) { a.f2(); } } </code></pre> And yet another way, you could have <code>B</code> instantiate one: <pre><code>public class B { private final A a; public B() { this.a = new A(); } public void f3() { this.a.f2(); } } </code></pre> And lastly, <code>B</code> could receive one in it's constructor: <pre><code> public class B { private final A a; public B(A a) { this.a = a; } public void f3() { this.a.f2(); } } </code></pre> The point being that if you want to invoke an instance method on a class you must have an instance of that class in your hand. Finally, I notice that you have <code>A.f1</code> invoking <code>B.f3</code> and from there you want to invoke <code>A.f2</code>. So, it looks like your best option here is the second option above. That is: <pre><code>public class A { private final B = new B(); public void f1() { this.b.f3(this); } public void f2() { /* do something */ } } public class B { public void f3(A a) { a.f2(); } } </code></pre> The key here is that we are passing an instance of <code>A</code> to <code>B.f3</code>. The way that we achieve that is by passing the <code>this</code> reference, which is a reference to the currently executing instance. In <code>A.f1</code>, that would be the instance of <code>A</code> that is currently executing.
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singulars
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1. This table or related slice is empty.
PostParentId
1. POForce the execution of a method in a class
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PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USjason
UserOwnerUserId
1. USꜱᴜʀᴇꜱʜ ᴀᴛᴛᴀ
plurals
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PostsAcceptedAnswerId
1. POForce the execution of a method in a class
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1. This table or related slice is empty.
VotesPostIdCreationDate
1. VO
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2. VO
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3. VO
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1. This table or related slice is empty.

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