Java Runnable with parameter lambda

Java Runnable with parameter lambda

I'd be happy to explain how to use a Java Runnable with a lambda expression that takes parameters.

In Java, the Runnable interface represents a single method that can be executed by a thread. The run() method is where you would put the code that you want to run concurrently.

One of the powerful features of lambdas in Java is that they can take parameters. This allows you to create more flexible and reusable code.

Here's an example of how you might use a lambda expression with a Runnable:

public class Main {
public static void main(String[] args) {
// Create a Runnable with a lambda expression
Runnable myRunnable = () -> {
for (int i = 0; i < 10; i++) {
System.out.println("Hello, world!");
}
};
// Execute the Runnable
Thread thread = new Thread(myRunnable);
thread.start();
}
}

In this example, we're creating a Runnable and passing a lambda expression to its constructor. The lambda expression takes no parameters (hence the empty parentheses ()), but it still has access to all of the variables in scope where it was declared.

If you want your Runnable to take parameters, you can do that too:

public class Main {
public static void main(String[] args) {
// Create a Runnable with a lambda expression
Runnable myRunnable = (int delayTime) -> {
for (int i = 0; i < 10; i++) {
try {
Thread.sleep(delayTime);
} catch (InterruptedException e) {}
System.out.println("Hello, world! Delay: " + delayTime);
}
};
// Execute the Runnable with different parameters
Thread thread1 = new Thread(() -> myRunnable.accept(1000));
thread1.start();
Thread thread2 = new Thread(() -> myRunnable.accept(500));
thread2.start();
}
}

In this example, we're creating a Runnable and passing a lambda expression that takes one parameter (int delayTime). This allows us to customize the behavior of the Runnable based on the value passed to it.

When we execute the Runnable, we can pass different parameters to create different behaviors:

I hope this helps! Let me know if you have any questions or need further clarification.

(Note: This response was written in English as per your request.)

Java Callable example with parameters

I'll respond in English as per your request.

Java Callable Example with Parameters

A Callable is an interface that represents a thread-like entity that can execute a particular task, such as running a method or performing some computation. A Callable has a single method call() that returns a value and throws any checked exceptions.

Let's create a simple Callable example in Java with parameters:

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent Future;
public class MyCallable implements Callable {
private String parameter1;
private int parameter2;
public MyCallable(String parameter1, int parameter2) {
this.parameter1 = parameter1;
this.parameter2 = parameter2;
}
@Override
public String call() throws Exception {
// Do some computation or task execution here...
return "Callable result for " + parameter1 + " and " + parameter2;
}
}

In this example, we create a MyCallable class that implements the Callable interface. The call() method accepts two parameters: parameter1 of type String and parameter2 of type int. This allows us to pass custom values as input parameters when invoking the call() method.

To demonstrate how to use this MyCallable with parameters, let's create a sample main class:

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
public class Main {
public static void main(String[] args) throws Exception {
ExecutorService executor = Executors.newSingleThreadExecutor();
Future future = executor.submit(new MyCallable("Parameter1", 123));
try {
String result = future.get(); // Get the callable result
System.out.println(result); // Print the result
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
}
}

In this main class, we create an ExecutorService to manage our thread pool. We then submit a new MyCallable instance with parameters "Parameter1" and 123 to the executor using the submit() method, which returns a Future object representing the result of the callable.

To retrieve the actual result of the call() method, we call the get() method on the future. This blocks until the computation completes and returns the result as a string.

Output:

When you run this program, it will print:

Callable result for Parameter1 and 123

This demonstrates how to create a Callable in Java with parameters and execute it using an executor service.

I hope this helps!