9- Chaining Consumer

Jun 29, 2026 19:22 · 4:28 · English · Whisper Turbo · 2 发言者

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讲座索引

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S… Speaker 1 (9- Chaining Consumer)

Earlier I briefly mentioned that the consumer interface has a default method called

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S… Speaker 1 (9- Chaining Consumer)

and then.

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S… Speaker 1 (9- Chaining Consumer)

With this method we can chain consumers which basically means we

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S… Speaker 1 (9- Chaining Consumer)

can run many operations in sequence.

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S… Speaker 1 (9- Chaining Consumer)

Let me show you how cool and powerful this is.

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S… Speaker 1 (9- Chaining Consumer)

So I'm going to create a list of strings and

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S… Speaker 1 (9- Chaining Consumer)

initialize it using list of.

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S… Speaker 1 (9- Chaining Consumer)

Here I'm going to pass three strings like a,

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S… Speaker 1 (9- Chaining Consumer)

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S… Speaker 1 (9- Chaining Consumer)

and c.

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S… Speaker 1 (9- Chaining Consumer)

Now you learn that the consumer interface represents an operation that takes

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S… Speaker 1 (9- Chaining Consumer)

a single argument and doesn't return a value.

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S… Speaker 1 (9- Chaining Consumer)

So let's declare a variable of type consumer of

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S… Speaker 1 (9- Chaining Consumer)

string.

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S… Speaker 1 (9- Chaining Consumer)

I'm going to call this print.

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S… Speaker 1 (9- Chaining Consumer)

Now we should set this to a lambda expression.

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S… Speaker 1 (9- Chaining Consumer)

This lambda expression should match this method.

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S… Speaker 1 (9- Chaining Consumer)

So it should have a parameter of type string and it shouldn't

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S… Speaker 1 (9- Chaining Consumer)

return a value.

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S… Speaker 1 (9- Chaining Consumer)

So here we add string item goes

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S… Speaker 1 (9- Chaining Consumer)

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S… Speaker 1 (9- Chaining Consumer)

Let's just print this item.

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S… Speaker 1 (9- Chaining Consumer)

Now once again,

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S… Speaker 1 (9- Chaining Consumer)

we can simplify this lambda expression by removing this type because

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S… Speaker 1 (9- Chaining Consumer)

the Java compiler knows that here we're consuming a string.

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S… Speaker 1 (9- Chaining Consumer)

So the item that we pass here is a string object.

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S… Speaker 1 (9- Chaining Consumer)

So there's no need to explicitly specify the type.

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S… Speaker 1 (9- Chaining Consumer)

Now because we have a single parameter,

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S… Speaker 1 (9- Chaining Consumer)

we can get rid of the parentheses.

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S… Speaker 1 (9- Chaining Consumer)

That is better.

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S… Speaker 1 (9- Chaining Consumer)

So here we're declaring an operation called

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S… Speaker 1 (9- Chaining Consumer)

print that takes an item and prints it on a terminal.

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S… Speaker 1 (9- Chaining Consumer)

Now let's declare another operation that prints a string in uppercase.

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S… Speaker 2 (9- Chaining Consumer)

So,

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S… Speaker 1 (9- Chaining Consumer)

once again,

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S… Speaker 1 (9- Chaining Consumer)

consumer of string,

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S… Speaker 1 (9- Chaining Consumer)

we call it print uppercase.

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S… Speaker 1 (9- Chaining Consumer)

Pay attention to how I'm naming these consumers.

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S… Speaker 1 (9- Chaining Consumer)

The name of this variable clearly represents this operation.

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S… Speaker 2 (9- Chaining Consumer)

So,

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S… Speaker 1 (9- Chaining Consumer)

once again,

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S… Speaker 1 (9- Chaining Consumer)

item goes to,

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S… Speaker 1 (9- Chaining Consumer)

you want to print this,

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S… Speaker 1 (9- Chaining Consumer)

but first we want to convert it to uppercase.

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S… Speaker 1 (9- Chaining Consumer)

Pretty straightforward,

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S… Speaker 1 (9- Chaining Consumer)

right?

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S… Speaker 1 (9- Chaining Consumer)

Now,

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S… Speaker 1 (9- Chaining Consumer)

we want to iterate over this list,

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S… Speaker 1 (9- Chaining Consumer)

and for each item,

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S… Speaker 1 (9- Chaining Consumer)

we want to execute these two operations in sequence.

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S… Speaker 1 (9- Chaining Consumer)

So we call list .foreach.

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S… Speaker 1 (9- Chaining Consumer)

Here we should pass a consumer object,

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S… Speaker 1 (9- Chaining Consumer)

so I'm going to pass print,

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S… Speaker 1 (9- Chaining Consumer)

now this consumer has a method called and then.

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S… Speaker 1 (9- Chaining Consumer)

Now look at the parameter of this method.

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S… Speaker 1 (9- Chaining Consumer)

Here we can pass a second consumer.

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S… Speaker 1 (9- Chaining Consumer)

So we can pass print uppercase.

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S… Speaker 1 (9- Chaining Consumer)

Now, when I run this program,

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S… Speaker 1 (9- Chaining Consumer)

you'll see that for each item,

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S… Speaker 1 (9- Chaining Consumer)

first we're going to print that item and then we're going to print it in uppercase.

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S… Speaker 1 (9- Chaining Consumer)

Take a look.

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S… Speaker 2 (9- Chaining Consumer)

There you go.

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S… Speaker 1 (9- Chaining Consumer)

That's pretty cool.

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S… Speaker 2 (9- Chaining Consumer)

Well,

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S… Speaker 1 (9- Chaining Consumer)

let me explain how the magic happens under the hood.

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S… Speaker 1 (9- Chaining Consumer)

So I'm going to put the caret on the method name and then,

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S… Speaker 1 (9- Chaining Consumer)

now on the top,

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S… Speaker 1 (9- Chaining Consumer)

if you go to the navigate menu,

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S… Speaker 1 (9- Chaining Consumer)

look at the shortcut for declaration.

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S… Speaker 1 (9- Chaining Consumer)

On Mac,

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S… Speaker 1 (9- Chaining Consumer)

it's command and B.

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S… Speaker 1 (9- Chaining Consumer)

On Windows,

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S… Speaker 1 (9- Chaining Consumer)

it's probably control and B.

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S… Speaker 1 (9- Chaining Consumer)

So I'm going to press command and B.

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S… Speaker 1 (9- Chaining Consumer)

Now you can see the source code of this method.

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S… Speaker 1 (9- Chaining Consumer)

So let's see what's happening here.

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S… Speaker 1 (9- Chaining Consumer)

This method takes a consumer object called after.

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S… Speaker 1 (9- Chaining Consumer)

First,

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S… Speaker 1 (9- Chaining Consumer)

it ensures that this argument is not null.

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S… Speaker 1 (9- Chaining Consumer)

Pretty straightforward.

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S… Speaker 1 (9- Chaining Consumer)

Now,

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S… Speaker 1 (9- Chaining Consumer)

look at what is returned here.

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S… Speaker 1 (9- Chaining Consumer)

We're returning a lambda expression.

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S… Speaker 1 (9- Chaining Consumer)

This lambda expression represents a consumer object.

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S… Speaker 1 (9- Chaining Consumer)

So it takes an argument of type T

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S… Speaker 1 (9- Chaining Consumer)

And in the body of this lambda,

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S… Speaker 1 (9- Chaining Consumer)

first we call the accept method of the current consumer.

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S… Speaker 1 (9- Chaining Consumer)

So we're executing the current operation and then we're

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S… Speaker 1 (9- Chaining Consumer)

calling the accept method of the second consumer.

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S… Speaker 1 (9- Chaining Consumer)

This is how two operations get executed sequentially.

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S… Speaker 1 (9- Chaining Consumer)

So every time we call this method,

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S… Speaker 1 (9- Chaining Consumer)

we get a new consumer.

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S… Speaker 1 (9- Chaining Consumer)

And that means once again we can call and then on that new consumer

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S… Speaker 1 (9- Chaining Consumer)

to chain another task.

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S… Speaker 1 (9- Chaining Consumer)

Let me show you.

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S… Speaker 2 (9- Chaining Consumer)

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S… Speaker 1 (9- Chaining Consumer)

Back to our demo once we call and then we get

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S… Speaker 1 (9- Chaining Consumer)

a new consumer object So here we can call and then and then

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S… Speaker 1 (9- Chaining Consumer)

pass another consumer object like print So with

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S… Speaker 1 (9- Chaining Consumer)

this code we're executing three operations in sequence

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S… Speaker 1 (9- Chaining Consumer)

Look at the result.

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S… Speaker 2 (9- Chaining Consumer)

There you go.

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S… Speaker 1 (9- Chaining Consumer)

We're printing each item three times on the terminal So

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S… Speaker 1 (9- Chaining Consumer)

this is how we can chain consumers

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