How to Run Java Program in CMD Using Notepad

In this section, we will learn how to save, compile, and run (execute) a Java program in Command Prompt (CMD) using notepad.

Before running (execute) a Java program, ensure that Java is installed in the system and the path is properly set. If the path is not properly set, we cannot run the Java program.

We must follow the steps given below to run a Java program.

Open the notepad and write a Java program into it.
Save the Java program by using the class name followed by .java extension.
Open the CMD, type the commands and run the Java program.

Let's create a Java program and run it using the Command Prompt.

Note: We are considering that Java is properly installed and the path is properly set in your system.

Step 1: Open the notepad by pressing the Windows Key + R, type notepad and press enter key, or click on the Ok button. It opens the notepad.

How to Run Java Program in CMD Using Notepad

Step 2: Write a Java program that you want to compile and run. We have written the following code in the notepad.

CharArrayToStringExample.java

public class CharArrayToStringExample
{
public static void main(String args[])
{
//character array
char[] ch = {'w', 'e', 'l', 'c', 'o', 'm', 'e', ' ' , 't', 'o', ' ', 'J', 'a', 'v', 'a', 't', 'p', 'o', 'i', 'n', 't'};
//constructor of the String class that parses char array as a parameter
String string = new String(ch);
//prints the string
System.out.println(string);
}
}

Step 3: To save a Java program press Ctrl + S key and provide the file name. Remember that the file name must be the same as the class name followed by the .java extension.

If you are writing the same Java program (as above) save it by providing the file name CharArrayToStringExample.java press enter key or click on the Save button.

We have saved the above program at the location C:\demo.

Now, we have created and saved the Java program. In the next step, we will compile and run the Java program.

Step 4: To compile and run a Java program, open the Command Prompt by pressing Windows Key + R, type cmd and press enter key or click on the Ok button. It opens the Command Prompt window.

Step 5: In the Command Prompt window, write the following commands.

cd\
cd demo

Now we are inside the demo folder where we have saved the Java program.

Step 6: To compile the Java program type the following command:

javac CharArrayToStringExample.java

When we compile a Java program without any error, it creates a .class file with the same name as the file name at the same location (where the program is saved).