java Command Examples

Java application launcher. More information: https://docs.oracle.com/en/java/javase/20/docs/specs/man/java.html.

• Execute a Java .class file that contains a main method by using just the class name:

java {{classname}}

• Execute a Java program and use additional third-party or user-defined classes:

java -classpath {{path/to/classes1}}:{{path/to/classes2}}:. {{classname}}

• Execute a .jar program:

java -jar {{filename.jar}}

• Execute a .jar program with debug waiting to connect on port 5005:

java -agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=*:5005 -jar {{filename.jar}}

• Display JDK, JRE and HotSpot versions:

java -version

• Display help:

java -help