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This tutorial explains how to compile multiple java files using a single command in Java.

Compilation is a term used to refer to the process of converting java source code into bytecode using JDK. To execute any Java file, we need to follow two steps: compile the code and then run the compiled code.

During the compilation process, JDK checks the code for correctness and syntax and generates a .classfile containing bytecodes that can only be read by JVM. Here, we will learn to compile single and multiple Java files using a single Java command.

So let's start by compiling the Java files first.

Compile a Java file

To understand how to compile multiple Java files using a single command, let us first understand how to compile a single Java file. Java provides a javac command to compile the source code and create a .classfile to compile a Java file.

Here, we have created a Hello class and Hello.javasaved the code with the name . To compile it, we have used javacthe command.

See the example below.

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

To compile the Java file, we have used the following command. This command will create a file in the current directory .class.

javac Hello.java

To run the file generated by the above command .class, we used the following javacommand, which uses JVM to execute the code.

java Hello

Output:

Hello

Compiling multiple Java files

First, create two java files Hello.java and Hello2.java and javaccompile them using command. We use the same command to compile multiple Java files by providing multiple Java file names.

See the example below.

document:Hello.java

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

document:Hello2.java

class Hello2 {
  public static void main(String[] args) {
    System.out.println("Hello from 2");
  }
}

To compile the above two Java files, we used the following command. This command will create two files in the same directory as Hello.classand .Hello2.class.class

javac Hello.java Hello2.java

Compile all Java files in the current directory

If we have multiple Java files in the current directory and want to compile all of them with a single Java command, we can use the following command. Here, we use *the wildcard to specify all the Java files.

javac *.java

If the Java files are in different directories, then use the following command. Here, we have specified the path of the directory and *to compile all the Java files under the specified directory.

See the command below.

javac / root / rohan / directoryname/*.java