Writing a Java program involves several steps:

1. Choose a text editor or Integrated Development Environment (IDE) to write your code in. Some popular Java IDEs include Eclipse, IntelliJ IDEA, and NetBeans.

2. Create a new file and save it with a .java extension. This will be your Java source file.

3. Write the Java code for your program. A simple Java program might look like this:

public class HelloWorld {
   public static void main(String[] args) {
      System.out.println("Hello, World");
   }
}

Compile the Java code by running the javac command in a terminal or command prompt and passing in the name of the source file. For example:

Copy codejavac HelloWorld.java

1. Run the compiled code by running the java command and passing in the name of the class that contains the main method. For example:

Copy codejava HelloWorld

This will output the text "Hello, World" to the console.

These are the basic steps to write and run a Java program. Of course, in practice, Java programs can be much more complex, but the basic process remains the same.