In Java, you typically use the Java Compiler (javac) that comes with the Java Development Kit (JDK) to compile your Java source code into bytecode, which can be executed on the Java Virtual Machine (JVM). There is no single “one compiler” for Java; instead, you use the standard JDK tools for compiling Java programs.

Here are the basic steps to compile a Java program using the Java Compiler (javac):

1. Install the JDK: If you haven’t already, you need to install the Java Development Kit (JDK) on your system. You can download the JDK from the official Oracle website or use OpenJDK, which is an open-source alternative.

2. Write Your Java Code: Create a Java source code file with a .java extension. For example, you can create a file named HelloWorld.java with your Java code.

3. Open a Command Prompt or Terminal: Open a command prompt (Windows) or terminal (macOS/Linux).

4. Navigate to the Directory: Use the cd command to navigate to the directory where your Java source code file is located.

5. Compile the Java Code: Run the javac command followed by the name of your Java source code file (without the .java extension):

If there are no syntax errors in your code, this command will generate a bytecode file named HelloWorld.class in the same directory.

6. Execute the Java Program: Once the code is compiled successfully, you can run your Java program using the java command, followed by the name of the class containing the main method (in this case, HelloWorld):

This will execute your Java program, and you should see the “Hello, World!” message printed to the console.

So, in summary, there isn’t a single “one compiler” for Java, but the standard Java Compiler (javac) is used to compile Java source code files, and you can execute the compiled code using the java command. These tools are part of the Java Development Kit (JDK).