3- Starting a Thread

Jul 03, 2026 14:37 · 3:14 · English · Whisper Turbo · 2 Wasemaji

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To create a thread in Java,

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we use the thread class that is declared in the java .lang package.

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So let's create a new thread object,

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new thread.

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Now,

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the constructor of this class is overloaded.

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The version that we use most often is the one that takes a runnable object.

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That is an object that implements the runnable interface.

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This runnable interface represents a task to be run on

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a thread.

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It's a very simple interface with a single method called run.

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So it has no parameters and returns void.

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So let's say we want to download many files concurrently.

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So the task that we're dealing with here is the task of downloading a file.

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So let's add a new class to our project.

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I'm going to call this download file task

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and have this class implement the runnable interface.

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Now here for simplicity,

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let's just print a message like downloading a

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file.

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So let's not worry about the complexities of downloading a file.

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We just want to focus on concurrency.

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Now,

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back to our demo class,

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let's create a new thread object.

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Here we should pass a new download file

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task.

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So this is how we can create a new thread.

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Now we call thread .start to start this thread.

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Now,

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when I run this program,

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the code for downloading a file will be executed in a separate thread.

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Let me show you how to verify it.

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So before we create a thread,

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let's print the name of the current thread.

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That is the thread that executes our main method.

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So print,

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here we call thread .currentThread

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.getName.

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So this static method,

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currentThread,

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returns the current thread.

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Each thread has a name and an ID.

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So we can call it getName or getID.

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In this case I'm going to call getName.

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Now back to our task class.

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Let's print the name of the current thread while downloading a file.

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So over here Let's append thread that

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current thread that get name Okay,

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now let's run our program So we

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have two threads one is the main thread that executed our main method and

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here's another thread that we explicitly created for downloading a file Each

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thread starts executes a task and then dies so we don't have to explicitly kill

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it Now let's make this example more interesting

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Let's wrap this inside a for loop to simulate downloading 10 files

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concurrently.

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So I'm going to add a for loop,

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I is 0,

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as long as it's less than 10,

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I plus plus,

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and here we start 10

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threads.

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Let's run our program again.

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Take a look.

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We have the main thread plus 10 extra threads for

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downloading 10 files concurrently.

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Now, even though these messages are appearing sequentially on the terminal,

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these threads start and run in parallel.

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So this is how we can create and start a thread in Java.

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