Compiling and Running · COS 212 Resources

Compiling

Once Java and Java JDK have been installed Java programs can be compiled using javac

man javac

NAME
       javac - Reads Java class and interface definitions and compiles them
       into bytecode and class files.

SYNOPSIS
       javac [ options ] [ sourcefiles ] [ classes] [ @argfiles ]

Examples

Explicitly list java source files to compile

javac Main.java

Compile all .java files in the current directory

javac *.java

This will generate .class files in the current directory. These can be executed using the java command, if they contain a

public static void main(String[] args)

method.

Running

The java command is used to run .class files that have a main method.

man java

NAME
        java - Launches a Java application.

SYNOPSIS
        java [options] classname [args]

Examples

java Main

Which will output

Hello, World!