5- Variable Capture

Jun 26, 2026 23:24 · 1:56 · English · Whisper Turbo · 2 Højttalere
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Forelæsningsindeks
Viser kun
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In the body of this lambda,
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we're using the message parameter that we have declared over here.
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But we can also access the local variables in the enclosing method.
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So I'm going to declare a variable called prefix and
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set it to hyphen.
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Now,
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here we can reference prefix and then append the message.
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So when we run,
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we get hyphen hello world.
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We can also access the static fields in the enclosing class.
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So I'm going to move this from here and declare it as a static
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field in this class.
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Public static string prefix.
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Set it to hyphen.
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Now we can access it in our lambda expression.
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So when we run,
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we get the same result as before.
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We can also access the instance fields.
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So I'm going to make this an instance field.
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and also make the show method an instance method.
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So as you can see,
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we can access the prefix field.
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Now,
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what about this?
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What do you think this represents here?
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It represents the current instance of the lambdas demo class.
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So if we type dot,
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you can see the prefix field and the show method.
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So this is one of the differences between lambda expressions and anonymous
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inner classes.
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In lambda expressions,
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this references the enclosing object,
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whereas in anonymous inner classes,
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this references the current instance of the anonymous inner class.
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Another difference between these two types is that anonymous inner classes can
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have state.
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So they can have fields to store some data in lambda expressions.
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We cannot have fields because this lambda expression is just representing
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an anonymous function.
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So we cannot have instance fields here.
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We cannot have state.
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We can only access the local variables declared in the enclosing object
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as well as the static and instance fields in the enclosing class.

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