Run() Method in Java

February 10, 2023

Run() Method in Java

In this article we will be discussing about run() method in Java.

The run() method that is available in the thread class is used to create a separate Runnable object. Otherwise, this method does nothing and returns.

Use of Run Method:

We can Call run function with the help of following methods:

run() method
Start() method

The code supplied in the run() method is performed when the run() function is called. The run() method can be used repeatedly.The run() method can be overloaded as well. We can achieve precise results from the approaches by adjusting the parameters.

Note Calling run method by itself can cause some problems.

Syntax:

public void run(){
    // operations;
}

Keywords and Variables

Data types

JVM vs JRE vs JDK

Type Conversion

How a code runs in Java

Calling run Function by Itself

we can call run button by itself by creating the object of the thread class.

Example:

Run

import java.util.*;

class Main {
  // Function Definition	
  public static void run(int count) {
    if (count == 0) {
      return;
    }
    System.out.println("Running the function: " + count);
    
	// Function calling itself  
	run(count - 1);
  }

  public static void main(String[] args) {
    int count = 5;
	 
	// Function calling  
    run(count);
  }
}

Output:

Running the function: 5
Running the function: 4
Running the function: 3
Running the function: 2
Running the function: 1

Explanation In this example, the run function takes an integer count as an argument and checks if it's equal to 0. If it is, the function returns, otherwise it prints a message and calls itself with count - 1 as the argument. The main function calls the run function with an initial value of 5 for count.

Calling run function by using Start

we can call run method by using start() method by creating the object of the thread class and by creating a thread object by passing the class variable.

Example:

Run

import java.util.*;
 
// class definition
class MyThread extends Thread {
  // function definition
  public void run() {
    System.out.println("In the run Function");
  }
}

public class Main {
  public static void main(String[] args) {
	// Initializng the object of the class
    MyThread myThread = new MyThread();
	
	// Function calling
	myThread.start();
  }
}

Output:

In the run Function

Explanation In the above example, the MyThread class extends the Thread class and overrides the run method. The main function creates an instance of MyThread and calls the start method on that instance, which creates a new thread of execution and invokes the run method in that new thread.on. Click the edit button to change this text.

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Run() Method in Java